US4621929A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fiber optic thermal anemometer
Assignee: Luxtron Corp
•
Filing: 1983-10-12
•
Granted: 1986-11-11
•
Expires: 2003-10-12
Abstract
Abstract To measure the heat transfer coefficient of a sample, an element with temperature sensitive optical properties is placed in contact or implanted in the sample. The element is heated or cooled. The temperature difference between the element and the unheated sample and the rate of heating or cooling indicate the heat transfer coefficient of the sample. In one embodiment, the element is heated or cooled at a constant rate. The heat transfer coefficient of the sample is then inversely related to the difference in temperature between the element and the unheated sample. Alternatively, the element may be heated or cooled at such a rate that the temperature difference between the element and the unheated sample remains substantially constant. The heat transfer coefficient of the sample then varies directly with the rate of heating or cooling. The heat transfer coefficient of a sample is a measure of its composition and other physical properties. The composition of gasses, liquids, the presence of bubbles in a liquid, and fluid levels can be detected by the optical technique. Pressure and flow rates of fluids can also be detected. The technique can be used also to more accurately measure the thermal conductivity and temperature of small objects with small heat capacities.
Inventors
- 👤 Stephen R. Phillips
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 18:24
CPC Classifications
G; G01; G01L; G01L11/00; G01L11/002; A; A61; A61B; A61B5/00; A61B5/02; A61B5/026; A61B5/0275; A61B5/028; G01F; G01F1/00; G01F1/05; G01F1/20; G01F1/32; G01F1/325; G01F1/3273; G01F1/68; G01F1/684; G01F1/688; G01F1/6884; G01F1/696; G01F1/698; G01F1/6986; G01F23/00; G01F23/22; G01K; G01K11/00; G01K11/32; G01K11/3206; G01K11/3213; G01L21/00; G01L21/10; G01N; G01N25/00; G01N25/18
Claims Analysis
Total Claims: 103
Claim 1
Independent Claim
100 words
An apparatus for testing the heat transfer coefficient of a sample in an environment comprising: an element having temperature sensitive optical properties and being adapted to contact or to be implanted in the sample; radiation heat transfer means for directly supplying heat to the element; means for transmitting electromagnetic radiation to said element; and means for optically detecting said temperature sensitive optical properties of the element to test the heat transfer coefficient of the sample, whereby the difference between the temperature of the element and that of the environment is an indication of the heat transfer coefficient of the sample.
Claim 2
Independent Claim
100 words
An apparatus for testing the heat transfer coefficient of a sample in an environment comprising: an element having temperature sensitive optical properties and being adapted to contact or to be implanted in the sample; radiation heat transfer means for directly supplying heat to the element; means for transmitting electromagnetic radiation to said element; and means for optically detecting said temperature sensitive optical properties of the element to test the heat transfer coefficient of the sample, whereby the difference between the temperature of the element and that of the environment is an indication of the heat transfer coefficient of the sample.
Claim 3
Dependent Claim
48 words
The apparatus of claim 1, further comprising a length of optical fiber having a first and a second end, wherein said element is held at the first end of said fiber and wherein said transmitting means and detecting means are held at the second end of the fiber.
Claim 4
Dependent Claim
140 words
A probe apparatus for testing the heat transfer coefficient of a sample in an environment, comprising: a length of optical fiber having a first and a second end; and an element held in optical communication with the first end of said optical fiber, said element having temperature sensitive optical properties and being adapted to contact or to be implanted in the sample, wherein the second end of the optical fiber is adapted to be connected to (a) a radiation heat transfer means for directly heating the element, (b) means for transmitting electromagnetic radiation to said element and (c) means for detecting the temperature of the element optically, in order to test the heat transfer coefficient of the sample whereby the difference between the temperature of the element and that of the environment is an indication of the heat transfer coefficient.
Claim 5
Dependent Claim
140 words
A probe apparatus for testing the heat transfer coefficient of a sample in an environment, comprising: a length of optical fiber having a first and a second end; and an element held in optical communication with the first end of said optical fiber, said element having temperature sensitive optical properties and being adapted to contact or to be implanted in the sample, wherein the second end of the optical fiber is adapted to be connected to (a) a radiation heat transfer means for directly heating the element, (b) means for transmitting electromagnetic radiation to said element and (c) means for detecting the temperature of the element optically, in order to test the heat transfer coefficient of the sample whereby the difference between the temperature of the element and that of the environment is an indication of the heat transfer coefficient.
Claim 6
Independent Claim
48 words
The apparatus of claims 1 or 3, wherein the radiation heat transfer means supplies heat at a substantially constant rate from said sample so that the heat transfer coefficient of the sample is inversely related to the difference between the temperature of the element and the ambient temperature.
Claim 7
Dependent Claim
45 words
The apparatus of claim 3, wherein the heat capacity of the sample is much greater than that of the element and the rate of heating of the sample is such that the ambient temperature of a large portion of the sample is substantially unaltered thereby.
Claim 8
Independent Claim
55 words
The apparatus of claims 1 or 3, wherein the radiation heat transfer means supplies heat at such rate that the difference between the temperature of the element in contact with the sample and the ambient temperature is substantially constant, so that the heat transfer coefficient of the sample is proportional to the rate of heating.
Claim 9
Dependent Claim
59 words
The apparatus of claim 6, wherein the heat capacity of the sample is much greater than that of the element and the rate of heating of the sample is such that the ambient temperature of the sample is substantially unaltered thereby so that when such ambient temperature remains substantially constant, the temperature of the element is maintained substantially constant.
Claim 10
Independent Claim
19 words
The apparatus of claims 1 or 3 wherein the temperature sensitive element includes a luminescent material in its composition.
Claim 11
Dependent Claim
34 words
The apparatus of claim 8, further comprising means for detecting the intensities of radiation at two distinct wavelengths from the luminescent material in said element to determine the temperature of the temperature sensitive element.
Claim 12
Dependent Claim
31 words
The apparatus of claim 8, further comprising means for detecting the luminescent response of the luminescent material in said element over time to determine the temperature of the temperature sensitive element.
Claim 13
Dependent Claim
24 words
The apparatus of claim 10, wherein said luminescent response detecting means detects a parameter indicative of the luminescent decay time of the luminescent material.
Claim 14
Independent Claim
26 words
The apparatus of claims 1 or 3 wherein the temperature sensitive element is a liquid crystal sensor whose light reflectance is a function of its temperature.
Claim 15
Independent Claim
25 words
The apparatus of claims 1 or 3 wherein the temperature sensitive element includes a semiconductor material which absorbs light energy as a function of temperature.
Claim 16
Independent Claim
59 words
The apparatus of claims 1 or 3 wherein the temperature sensitive element includes a luminescent material and wherein said radiation heat transfer means comprises: an optical filter that absorbs electromagnetic radiation, said filter placed in heat conductive relationship with the element; and source for supplying electromagnetic radiation to said filter for heating the elements by heating the optical filter.
Claim 17
Dependent Claim
33 words
The apparatus of claim 14 wherein the optical filter absorbs electromagnetic radiation in a manner that does not interfere substantially with the transmission of electromagnetic radiation by the transmitting means to said element.
Claim 18
Dependent Claim
30 words
The apparatus of claim 14 wherein the optical filter and the temperature sensitive element is one member comprising a heat absorbing medium into which a temperature sensitive material is dispersed.
Claim 19
Dependent Claim
12 words
The apparatus of claim 16 wherein the temperature sensitive material is phosphor.
Claim 20
Independent Claim
110 words
The apparatus of claims 2 or 3 wherein the temperature sensitive element includes a luminescent material and wherein said radiation heat transfer means comprises: an optical filter that absorbs light in a manner which does not interfere substantially with the transmission of electromagnetic radiation to said element by the transmitting means and with the optical detection of the temperature of the element, said filter placed between said first end and the element and in heat conductive relationship with the element; and source for supplying light to said second end, said light being transmitted by the optical fiber to its first end for heating the element by heating the optical filter.
Claim 21
Dependent Claim
36 words
The apparatus of claim 18 wherein the optical filter absorbs light within a frequency range which does not overlap with the frequencies of radiation emitted by the element and of radiation transmitted by the transmitting means.
Claim 22
Dependent Claim
12 words
The apparatus of claim 19 wherein the optical filter absorbs infrared light.
Claim 23
Independent Claim
55 words
The apparatus of claims 2 or 3 wherein the temperature sensitive element includes phosphor in its composition and wherein said radiation heat transfer means comprises a source for supplying ultraviolet light to said second end which is then transmitted by the optical fiber to the phosphor in the temperature sensitive element to heat the element.
Claim 24
Independent Claim
53 words
The apparatus of claims 1 or 3 wherein said radiation heat transfer means comprises: a heating member which absorbs radio frequency electromagnetic waves, said heating member being placed in heat conductive relationship with said element; and means for supplying radio frequency electromagnetic waves to said heating member to supply heat to said element.
Claim 25
Independent Claim
44 words
The apparatus of claims 1 or 3 wherein said radiation heat transfer means comprises: a heating member which absorbs ultrasonic waves, said heating member being placed in heat conductive relationship with said element; and a source for supplying ultrasonic waves to said heating member.
Claim 26
Independent Claim
24 words
The apparatus of claims 1 or 3 wherein said radiation heat transfer means comprises means for supplying heat to a medium surrounding the element.
Claim 27
Dependent Claim
100 words
A probe apparatus for testing the heat transfer coefficient of a sample in an environment, comprising: a length of optical fiber; an element held in optical communication with a first end of said optical fiber, said element having temperature sensitive optical properties and being adapted to contact or to be implanted in the sample; and radiation heat transfer means for directly supplying heat to the element to test the heat transfer coefficient of the sample whereby the difference between the temperature of the element and that of the environment is an indication of the heat transfer coefficient of the sample.
Claim 28
Dependent Claim
100 words
A probe apparatus for testing the heat transfer coefficient of a sample in an environment, comprising: a length of optical fiber; an element held in optical communication with a first end of said optical fiber, said element having temperature sensitive optical properties and being adapted to contact or to be implanted in the sample; and radiation heat transfer means for directly supplying heat to the element to test the heat transfer coefficient of the sample whereby the difference between the temperature of the element and that of the environment is an indication of the heat transfer coefficient of the sample.
Claim 29
Independent Claim
131 words
An apparatus for testing the heat transfer coefficient of a sample in an environment comprising: a length of optical fiber; an element held in optical communication with one end of said fiber, said element having temperature sensitive optical properties and being adapted to contact or to be implanted in the sample; radiation heat transfer means for directly supplying heat to the element; means at the other end of the fiber for transmitting electromagnetic radiation to said element; and means at the other end of the fiber for optically detecting said temperature sensitive optical properties of the element to test the heat transfer coefficient of the sample whereby the difference between the temperature of the element and that of the environment is an indication of the heat transfer coefficient of the sample.
Claim 30
Independent Claim
131 words
An apparatus for testing the heat transfer coefficient of a sample in an environment comprising: a length of optical fiber; an element held in optical communication with one end of said fiber, said element having temperature sensitive optical properties and being adapted to contact or to be implanted in the sample; radiation heat transfer means for directly supplying heat to the element; means at the other end of the fiber for transmitting electromagnetic radiation to said element; and means at the other end of the fiber for optically detecting said temperature sensitive optical properties of the element to test the heat transfer coefficient of the sample whereby the difference between the temperature of the element and that of the environment is an indication of the heat transfer coefficient of the sample.
Claim 31
Independent Claim
135 words
An apparatus for testing the thermal heat transfer coefficient of a sample in an environment comprising: a first length of optical fiber; a temperature sensitive element held at a first end of said optical fiber, said element having temperature sensitive luminescent properties and being adapted to contact or to be implanted in the sample; radiation heat transfer means for directly supplying heat to the element; means at the second end of the optical fiber for exciting said temperature sensitive element; and means at said second end of the optical fiber for optically detecting the temperature sensitive luminescent properties of said element to test the heat transfer coefficient of the sample whereby the difference between the temperature of the element and that of the environment is an indication of the heat transfer coefficient of the sample.
Claim 32
Independent Claim
135 words
An apparatus for testing the thermal heat transfer coefficient of a sample in an environment comprising: a first length of optical fiber; a temperature sensitive element held at a first end of said optical fiber, said element having temperature sensitive luminescent properties and being adapted to contact or to be implanted in the sample; radiation heat transfer means for directly supplying heat to the element; means at the second end of the optical fiber for exciting said temperature sensitive element; and means at said second end of the optical fiber for optically detecting the temperature sensitive luminescent properties of said element to test the heat transfer coefficient of the sample whereby the difference between the temperature of the element and that of the environment is an indication of the heat transfer coefficient of the sample.
Claim 33
Dependent Claim
29 words
The apparatus of claim 27 wherein said element includes phosphor in its composition and wherein said means for exciting said temperature sensitive element comprises a source of ultraviolet light.
Claim 34
Dependent Claim
114 words
The apparatus of claim 28, wherein said radiation heat transfer means comprises an infrared light source, said apparatus further comprising four additional optical fibers in optical communication with said first length of optical fiber, the four additional lengths of optical fibers being so spatially oriented that a first additional optic fiber is used to transmit ultraviolet light from the exciting means to said element, a second additional optical fiber transmits infrared light from the infrared light source to said element, a third and a fourth additional optical fiber for transmitting the electromagnetic transmission from said element to detectors for detecting the intensities of radiation at two distinct wavelengths from the phosphor in said element.
Claim 35
Independent Claim
120 words
An apparatus for measuring the flow rate of a fluid comprising: a length of optical fiber; a temperature sensitive element held at a first end of said optical fiber, said element having temperature sensitive luminescent properties and being adapted to be placed in the flowing fluid; radiation heat transfer means for directly supplying heat to the element; means at the second end of the optical fiber for exciting said temperature sensitive element; and means at the second end of the optical fiber for detecting electromagnetic radiation emitted by said element to indicate the flow rate of the fluid whereby the difference between the temperature of the element and that of the unheated fluid is an indication of the flow rate.
Claim 36
Independent Claim
120 words
An apparatus for measuring the flow rate of a fluid comprising: a length of optical fiber; a temperature sensitive element held at a first end of said optical fiber, said element having temperature sensitive luminescent properties and being adapted to be placed in the flowing fluid; radiation heat transfer means for directly supplying heat to the element; means at the second end of the optical fiber for exciting said temperature sensitive element; and means at the second end of the optical fiber for detecting electromagnetic radiation emitted by said element to indicate the flow rate of the fluid whereby the difference between the temperature of the element and that of the unheated fluid is an indication of the flow rate.
Claim 37
Dependent Claim
50 words
The apparatus of claim 30 wherein the radiation heat transfer means supplies heat to the element at a substantially constant rate so that the flow rate of the fluid varies inversely with the difference in temperature between the element and the fluid thermally unaffected by the radiation heat transfer means.
Claim 38
Dependent Claim
57 words
The apparatus of claim 30 wherein the radiation heat transfer means supplies heat at such a rate that the difference in temperature between the element and the fluid thermally unaffected by the radiation heat transfer means remains substantially constant so that the flow rate of the fluid varies directly with the rate of heating of the element.
Claim 39
Independent Claim
94 words
A method for measuring the flow rate of a fluid by means of an element having temperature sensitive luminescent properties, said method comprising: placing the temperature sensitive element in the flowing fluid; directly supplying heat to the element; exciting said temperature sensitive element to luminescence; detecting the electromagnetic radiation emitted by said element to detect the temperature of the element; and detecting the temperature of the unheated fluid so that the difference between the temperature of the element and that of the unheated fluid is an indication of the flow rate of the fluid.
Claim 40
Independent Claim
94 words
A method for measuring the flow rate of a fluid by means of an element having temperature sensitive luminescent properties, said method comprising: placing the temperature sensitive element in the flowing fluid; directly supplying heat to the element; exciting said temperature sensitive element to luminescence; detecting the electromagnetic radiation emitted by said element to detect the temperature of the element; and detecting the temperature of the unheated fluid so that the difference between the temperature of the element and that of the unheated fluid is an indication of the flow rate of the fluid.
Claim 41
Independent Claim
136 words
An apparatus for measuring the flow rate of a fluid comprising: a length of optical fiber; a temperature sensitive element held at one end of said fiber optic, said element having temperature sensitive luminescent properties and being adapted to be placed in the flowing fluid; a vortex generating element also placed in the flowing fluid but at a location upstream relative to said element so that vortices generated thereby will come into contact with the element; radiation heat transfer means for directly supplying heat to the element; means at a second end of the optical fiber for exciting said temperature sensitive element; and means at a second end of the optical fiber for detecting electromagnetic radiation emitted by said element to determine the frequency of generation of vortices which indicates the flow rate of the fluid.
Claim 42
Independent Claim
136 words
An apparatus for measuring the flow rate of a fluid comprising: a length of optical fiber; a temperature sensitive element held at one end of said fiber optic, said element having temperature sensitive luminescent properties and being adapted to be placed in the flowing fluid; a vortex generating element also placed in the flowing fluid but at a location upstream relative to said element so that vortices generated thereby will come into contact with the element; radiation heat transfer means for directly supplying heat to the element; means at a second end of the optical fiber for exciting said temperature sensitive element; and means at a second end of the optical fiber for detecting electromagnetic radiation emitted by said element to determine the frequency of generation of vortices which indicates the flow rate of the fluid.
Claim 43
Dependent Claim
69 words
The apparatus of claim 34 wherein the radiation heat transfer means supplies heat to the element at a substantially constant rate so that when the vortex comes into contact with the first end of said fiber, the higher flow rate of the vortex will cause the temperature of said element to fluctuate so that the frequency of such temperature fluctuations will indicate the frequency of generation of the vortices.
Claim 44
Dependent Claim
96 words
The apparatus of claim 34 wherein the radiation heat transfer means supplies heat at such a rate that the difference in temperature between the element and the fluid thermally unaffected by the radiation heat transfer means remains substantially constant so that when a vortex reaches the first end of said fiber, the high flow rate of the fluid at the vortic will cause the rate of heat supplied to the element to increase momentarily so that the frequency of such momentary increases in the heat transfer rate will indicate the frequency of generation of the vortices.
Claim 45
Independent Claim
104 words
A method for measuring the flow rate of a fluid by means of an element having temperature sensitive luminescent properties and a vortex generating element, said method comprising: placing the temperature sensitive element in the flowing fluid; placing the vortex generating element in the flowing fluid at a location upstream relative to said element so that vortices generated thereby will come into contact with the element; directly supplying heat to the element; exciting said temperature sensitive element to luminescence; and detecting the electromagnetic radiation emitted by said element to determine the frequency of generation of vortices which indicates the flow rate of the fluid.
Claim 46
Independent Claim
104 words
A method for measuring the flow rate of a fluid by means of an element having temperature sensitive luminescent properties and a vortex generating element, said method comprising: placing the temperature sensitive element in the flowing fluid; placing the vortex generating element in the flowing fluid at a location upstream relative to said element so that vortices generated thereby will come into contact with the element; directly supplying heat to the element; exciting said temperature sensitive element to luminescence; and detecting the electromagnetic radiation emitted by said element to determine the frequency of generation of vortices which indicates the flow rate of the fluid.
Claim 47
Independent Claim
158 words
An apparatus for measuring the flow rate of a fluid comprising: a length of optical fiber; a temperature sensitive element held at one end of said fiber, said element having temperature sensitive luminescent properties and being adapted to be placed in the flowing fluid; radiation heat transfer means for supplying heat to a bolus of fluid at a known distance upstream from said element; means at a second end of the optical fiber for exciting said temperature sensitive element; and means at said second end of the optical fiber for detecting electromagnetic radiation emitted by said element to determine the time of arrival and temperature differences of said bolus of fluid at the element thereby also determining the flow rate of the fluid wherein the radiation heat transfer means comprises means for heating a portion of the optical fiber between the first and second ends, said portion being placed upstream and at a known distance from said element.
Claim 48
Independent Claim
158 words
An apparatus for measuring the flow rate of a fluid comprising: a length of optical fiber; a temperature sensitive element held at one end of said fiber, said element having temperature sensitive luminescent properties and being adapted to be placed in the flowing fluid; radiation heat transfer means for supplying heat to a bolus of fluid at a known distance upstream from said element; means at a second end of the optical fiber for exciting said temperature sensitive element; and means at said second end of the optical fiber for detecting electromagnetic radiation emitted by said element to determine the time of arrival and temperature differences of said bolus of fluid at the element thereby also determining the flow rate of the fluid wherein the radiation heat transfer means comprises means for heating a portion of the optical fiber between the first and second ends, said portion being placed upstream and at a known distance from said element.
Claim 49
Dependent Claim
67 words
The apparatus of claim 38 wherein said means for heating a portion of the optical fiber comprises: an optical filter that absorbs electromagnetic radiation but transmits at least some light emitted by said element upon excitation, said filter placed between said first and second ends of the optical fiber; and source for supplying electromagnetic radiation to said second end of the fiber for heating the optical filter.
Claim 50
Independent Claim
223 words
An apparatus for measuring the flow rate of a fluid comprising: a length of optical fiber; a temperature sensitive element held at one end or said fiber, said element having temperature sensitive luminescent properties and being adapted to be placed in the flowing fluid; a radiation heat transfer means for supplying heat to a bolus of fluid at a known distance upstream from said element; means at a second end of the optical fiber for exciting said temperature sensitive element and; means at said second end of the optical fiber for detecting electromagnetic radiation emitted by said element to determine the time of arrival and temperature differences of said bolus of fluid at the element thereby also determining the flow rate of the fluid, wherein said radiation transfer means comprises: a length of a second optical fiber adapted to be placed in the fluid upstream from said element; an optical filter that absorbs electromagnetic radiation, said filter being implanted in said second optic fiber so that heating of the filter will cause heat to be transferred between the filter and the fluid surrounding the second optical fiber; and source for supplying a pulse of electromagnetic radiation to said second optical fiber for heating the filter momentarily so that the bolus of fluid surrounding the filter will be heated before it reaches said element.
Claim 51
Independent Claim
223 words
An apparatus for measuring the flow rate of a fluid comprising: a length of optical fiber; a temperature sensitive element held at one end or said fiber, said element having temperature sensitive luminescent properties and being adapted to be placed in the flowing fluid; a radiation heat transfer means for supplying heat to a bolus of fluid at a known distance upstream from said element; means at a second end of the optical fiber for exciting said temperature sensitive element and; means at said second end of the optical fiber for detecting electromagnetic radiation emitted by said element to determine the time of arrival and temperature differences of said bolus of fluid at the element thereby also determining the flow rate of the fluid, wherein said radiation transfer means comprises: a length of a second optical fiber adapted to be placed in the fluid upstream from said element; an optical filter that absorbs electromagnetic radiation, said filter being implanted in said second optic fiber so that heating of the filter will cause heat to be transferred between the filter and the fluid surrounding the second optical fiber; and source for supplying a pulse of electromagnetic radiation to said second optical fiber for heating the filter momentarily so that the bolus of fluid surrounding the filter will be heated before it reaches said element.
Claim 52
Independent Claim
117 words
A method for measuring the flow rate of a fluid by means of a length of optical fiber and an element having temperature sensitive luminescent properties placed at one end of the optical fiber, said method comprising: placing the temperature sensitive element and said one end of the optical fiber in the flowing fluid; directly supplying heat to a portion of the optical fiber for heating a bolus of fluid at a known distance upstream from said element; exciting said temperature sensitive element to luminescence; and detecting the electromagnetic radiation emitted by said element to determine the time of travel and temperature differences of said bolus of fluid thereby also determining the flow rate of the fluid.
Claim 53
Independent Claim
117 words
A method for measuring the flow rate of a fluid by means of a length of optical fiber and an element having temperature sensitive luminescent properties placed at one end of the optical fiber, said method comprising: placing the temperature sensitive element and said one end of the optical fiber in the flowing fluid; directly supplying heat to a portion of the optical fiber for heating a bolus of fluid at a known distance upstream from said element; exciting said temperature sensitive element to luminescence; and detecting the electromagnetic radiation emitted by said element to determine the time of travel and temperature differences of said bolus of fluid thereby also determining the flow rate of the fluid.
Claim 54
Independent Claim
136 words
An apparatus for detecting the presence of a first fluid in a second fluid, said two fluids being immiscible and having different thermal properties, said apparatus comprising: a length of optical fiber a first end of which is adapted to be inserted into the second fluid; a temperature sensitive element held at the first end of said fiber, said element having temperature sensitive luminescent properties; radiation heat transfer means for directly supplying heat to the element; means at a second end of the optical fiber for exciting said temperature sensitive element; and means at a second end of the optical fiber for detecting electromagnetic radiation emitted by said element to detect the temperature of the element and the presence of the first fluid whereby such presence is indicated by a change in temperature of the element.
Claim 55
Independent Claim
136 words
An apparatus for detecting the presence of a first fluid in a second fluid, said two fluids being immiscible and having different thermal properties, said apparatus comprising: a length of optical fiber a first end of which is adapted to be inserted into the second fluid; a temperature sensitive element held at the first end of said fiber, said element having temperature sensitive luminescent properties; radiation heat transfer means for directly supplying heat to the element; means at a second end of the optical fiber for exciting said temperature sensitive element; and means at a second end of the optical fiber for detecting electromagnetic radiation emitted by said element to detect the temperature of the element and the presence of the first fluid whereby such presence is indicated by a change in temperature of the element.
Claim 56
Dependent Claim
39 words
The apparatus of claim 42 wherein the radiation heat transfer means supplies heat to the element at a substantially constant rate so that the presence of the first fluid is indicated by a change in temperature of said element.
Claim 57
Dependent Claim
66 words
The apparatus of claim 42 wherein the radiation heat transfer means supplies heat to the element at such rate that the difference in temperature between the element and the second fluid thermally unaffected by the radiation heat transfer means remains substantially constant so that the presence of the first fluid is indicated by a change in the rate of heat supplied or withdrawn from the element.
Claim 58
Dependent Claim
19 words
The apparatus of claim 42 wherein said first fluid is a gas and said second fluid is a liquid.
Claim 59
Dependent Claim
19 words
The apparatus of claim 45 wherein the liquid is blood and the gas to be detected is air embolism.
Claim 60
Independent Claim
99 words
A method for detecting the presence of a first fluid in a second fluid said two fluids being immiscible and having different thermal properties by means of an element having temperature sensitive luminescent properties, said method comprising: placing the temperature sensitive element in the second fluid; directly supplying heat to the element; exciting said temperature sensitive element to luminescence; and detecting the electromagnetic radiation emitted by said element to detect the temperature of the element and the presence of the first fluid in the second fluid whereby such presence is indicated by a change in temperature of the element.
Claim 61
Independent Claim
99 words
A method for detecting the presence of a first fluid in a second fluid said two fluids being immiscible and having different thermal properties by means of an element having temperature sensitive luminescent properties, said method comprising: placing the temperature sensitive element in the second fluid; directly supplying heat to the element; exciting said temperature sensitive element to luminescence; and detecting the electromagnetic radiation emitted by said element to detect the temperature of the element and the presence of the first fluid in the second fluid whereby such presence is indicated by a change in temperature of the element.
Claim 62
Independent Claim
127 words
An apparatus for determining the composition of a mixture of fluids having different heat capacities and conductivities, comprising: a length of optical fiber; a temperature sensitive element held at a first end of said optical fiber, said element having temperature sensitive luminescent properties and being adapted to be placed in the fluid mixture; radiation heat transfer means for directly supplying heat to the element; means at a second end of the optical fiber for exciting said temperature sensitive element; and means at a second end of the optical fiber for detecting electromagnetic radiation emitted by said element to indicate the temperature of the element and the composition of the fluid mixture whereby the temperature of the element is an indication of the composition of the fluid mixture.
Claim 63
Independent Claim
127 words
An apparatus for determining the composition of a mixture of fluids having different heat capacities and conductivities, comprising: a length of optical fiber; a temperature sensitive element held at a first end of said optical fiber, said element having temperature sensitive luminescent properties and being adapted to be placed in the fluid mixture; radiation heat transfer means for directly supplying heat to the element; means at a second end of the optical fiber for exciting said temperature sensitive element; and means at a second end of the optical fiber for detecting electromagnetic radiation emitted by said element to indicate the temperature of the element and the composition of the fluid mixture whereby the temperature of the element is an indication of the composition of the fluid mixture.
Claim 64
Dependent Claim
61 words
The apparatus of claim 48 wherein the radiation heat transfer means supplies heat to the element at a substantially constant rate so that the proportion of a fluid in the fluid mixture with a lower thermal capacity and conductivity varies inversely with a difference in temperature between the element and the fluid mixture thermally unaffected by the radiation heat transfer means.
Claim 65
Dependent Claim
67 words
The apparatus of claim 48 wherein the radiation heat transfer means supplies heat at such a rate that the difference in temperature between the element and the fluid mixture thermally unaffected by the heat transfer means remains substantially constant so that the proportion of the fluid in the mixture with a smaller heat capacity and heat conductance varies directly with the rate of heating of the element.
Claim 66
Independent Claim
116 words
An apparatus for measuring the pressure of a fluid comprising: a length of optical fiber; a temperature sensitive element held at a first end of said optical fiber, said element having temperature sensitive luminescent properties and being adapted to be placed in the fluid; radiation heat transfer means for directly supplying heat to the element; means at the second end of the optical fiber for exciting said temperature sensitive element; and means at the second end of the optical fiber for detecting electromagnetic radiation emitted by said element to detect the temperature of the element and the pressure of the fluid whereby the temperature of the element is an indication of the pressure of the fluid.
Claim 67
Independent Claim
116 words
An apparatus for measuring the pressure of a fluid comprising: a length of optical fiber; a temperature sensitive element held at a first end of said optical fiber, said element having temperature sensitive luminescent properties and being adapted to be placed in the fluid; radiation heat transfer means for directly supplying heat to the element; means at the second end of the optical fiber for exciting said temperature sensitive element; and means at the second end of the optical fiber for detecting electromagnetic radiation emitted by said element to detect the temperature of the element and the pressure of the fluid whereby the temperature of the element is an indication of the pressure of the fluid.
Claim 68
Dependent Claim
49 words
The apparatus of claim 51 wherein the radiation heat transfer means supplies heat to the element at a substantially constant rate so that the pressure of the fluid varies inversely with a difference in temperature between the elements and the fluid thermally unaffected by the radiation heat transfer means.
Claim 69
Dependent Claim
58 words
The apparatus of claim 51 wherein the radiation heat transfer means supplies heat at such a rate that the difference in temperature between the element and the fluid thermally unaffected by the radiation heat transfer means remains substantially constant so that the pressure of the fluid varies directly with the rate of heating or cooling of the element.
Claim 70
Independent Claim
70 words
A method for measuring the pressure of a fluid by means of an element having temperature sensitive luminescent properties, said method comprising: placing the temperature sensitive element in the fluid; directly supplying heat to the element; exciting said temperature sensitive element to luminescence; and detecting the electromagnetic radiation emitted by said element to detect the temperature of the element, said temperature being an indication of the pressure of the fluid.
Claim 71
Independent Claim
70 words
A method for measuring the pressure of a fluid by means of an element having temperature sensitive luminescent properties, said method comprising: placing the temperature sensitive element in the fluid; directly supplying heat to the element; exciting said temperature sensitive element to luminescence; and detecting the electromagnetic radiation emitted by said element to detect the temperature of the element, said temperature being an indication of the pressure of the fluid.
Claim 72
Independent Claim
120 words
An apparatus for measuring the pressure of a gas above a liquid comprising: a length of optical fiber; a temperature sensitive element held at a first end of said optical fiber, said element having temperature sensitive luminescent properties and being adapted to be placed in the gas at a location immediately above the surface of the liquid; means for heating the liquid to boiling state; means at the second end of the optical fiber for exciting said temperature sensitive element; and means at a second end of the optical fiber for detecting electromagnetic radiation emitted by said element to determine the temperature of the vapor from the boiling liquid said temperature being an indication of the pressure of the gas.
Claim 73
Independent Claim
120 words
An apparatus for measuring the pressure of a gas above a liquid comprising: a length of optical fiber; a temperature sensitive element held at a first end of said optical fiber, said element having temperature sensitive luminescent properties and being adapted to be placed in the gas at a location immediately above the surface of the liquid; means for heating the liquid to boiling state; means at the second end of the optical fiber for exciting said temperature sensitive element; and means at a second end of the optical fiber for detecting electromagnetic radiation emitted by said element to determine the temperature of the vapor from the boiling liquid said temperature being an indication of the pressure of the gas.
Claim 74
Independent Claim
88 words
A method for measuring the pressure of a gas above a liquid by means of an element having temperature sensitive luminescent properties, said method comprising: placing the temperature sensitive element in the gas at a location immediately above the surface of the liquid; heating the liquid to a boiling state; exciting said temperature sensitive element to luminescence; and detecting the electromagnetic radiation emitted by said element to determine the temperature of the vapor from the boiling liquid said temperature being an indication of the pressure of the gas.
Claim 75
Independent Claim
88 words
A method for measuring the pressure of a gas above a liquid by means of an element having temperature sensitive luminescent properties, said method comprising: placing the temperature sensitive element in the gas at a location immediately above the surface of the liquid; heating the liquid to a boiling state; exciting said temperature sensitive element to luminescence; and detecting the electromagnetic radiation emitted by said element to determine the temperature of the vapor from the boiling liquid said temperature being an indication of the pressure of the gas.
Claim 76
Independent Claim
162 words
An apparatus for determining levels between immiscible fluids having different thermal capacities and conductivities, said apparatus comprising: a plurality of optical fibers, each fiber being placed with its first end placed at a desired location in one of the fluids for determining the level between said fluid and the fluid immediately above; a temperature sensitive element held at each of the first ends of said plurality of optical fibers, said element having temperature sensitive luminescent properties and being adapted to be placed in the corresponding fluid; radiation heat transfer means for directly supplying heat to each of the elements; means at the second end of each optical fiber for exciting the temperature sensitive element held at the first end of such fiber; and means at the second end of each optical fiber for detecting electromagnetic radiation emitted by the element held to such fiber to detect the temperature of each element, said temperature being an indication of the levels between the fluids.
Claim 77
Independent Claim
162 words
An apparatus for determining levels between immiscible fluids having different thermal capacities and conductivities, said apparatus comprising: a plurality of optical fibers, each fiber being placed with its first end placed at a desired location in one of the fluids for determining the level between said fluid and the fluid immediately above; a temperature sensitive element held at each of the first ends of said plurality of optical fibers, said element having temperature sensitive luminescent properties and being adapted to be placed in the corresponding fluid; radiation heat transfer means for directly supplying heat to each of the elements; means at the second end of each optical fiber for exciting the temperature sensitive element held at the first end of such fiber; and means at the second end of each optical fiber for detecting electromagnetic radiation emitted by the element held to such fiber to detect the temperature of each element, said temperature being an indication of the levels between the fluids.
Claim 78
Dependent Claim
61 words
The apparatus of claim 57 wherein the radiation heat transfer means supplies heat to each element at a substantially constant rate so that when the level between the fluid in which the element is placed and the fluid immediately above falls below the level of said element, such change in level is indicated by a change in temperature of such element.
Claim 79
Independent Claim
23 words
The apparatus of claims 31, 35, 43, 49, 52 or 58 further comprising means for measuring the temperature of the thermally unaffected fluid.
Claim 80
Dependent Claim
103 words
The apparatus of claim 59 wherein said temperature measuring means comprises: a length of a second optical fiber; a second element held at one end of said second optical fiber, said second element having temperature sensitive luminescent properties and being adapted to be placed in the fluid at a location substantially unaffected by the heating by the radiation heat transfer means; means at the other end of the optical fiber for exciting said second element; and means at said other end of the fiber for detecting the electromagnetic radiation emitted by said second element to determine the temperature of the thermally unaffected fluid.
Claim 81
Independent Claim
84 words
The apparatus of claims 31, 35, 43, 49, 52 or 58 further comprising means for turning the radiation heat transfer means on and off periodically, so that the radiation detected by the detecting means at a time during which the radiation heat transfer means is on indicates the temperature of the element when it is heated, and the radiation detected at a selected time after the radiation heat transfer means is turned off indicates the temperature of the thermally unaffected fluid at such time.
Claim 82
Dependent Claim
53 words
The apparatus of claim 61 wherein said means for turning on and off the radiation heat transfer means is adapted to turn on and off the radiation heat transfer means at a selected rate that corresponds to the rapidity of temperature variations of the fluid thermally unaffected by the radiation heat transfer means.
Claim 83
Dependent Claim
88 words
The apparatus of claim 57 wherein the radiation heat transfer means supplies heat to each element at such rate that the difference in temperature between such element and the portion of the fluid thermally unaffected by the radiation heat transfer means remains substantially constant so that when the level between the fluid into which such element is placed and the fluid immediately above falls below the level of such element such change in level is indicated by a rise in the rate of heat supplied to the element.
Claim 84
Independent Claim
65 words
The apparatus of claims 32, 36, 44, 50 or 63 wherein the radiation heat transfer means includes a control means comprising: means for measuring the temperature of the thermally unaffected fluid; and means responsive to the difference between the temperature of the element and that of the thermally unaffected fluid for changing, when required, the rate of heating so that such difference remains substantially constant.
Claim 85
Independent Claim
99 words
A method for determining the level between two immiscible fluids having different thermal properties as the level changes, with an element having temperature sensitive luminescent properties, said method comprising: placing the temperature sensitive element at a desired location in the fluid with the lower altitude for determining the level between said fluid and the fluid above; directly supplying heat to the element; exciting the temperature sensitive element to luminescence; and detecting the electromagnetic radiation emitted by the element to detect the temperature of the element, said temperature being an indication of the level between the fluids as it changes.
Claim 86
Independent Claim
99 words
A method for determining the level between two immiscible fluids having different thermal properties as the level changes, with an element having temperature sensitive luminescent properties, said method comprising: placing the temperature sensitive element at a desired location in the fluid with the lower altitude for determining the level between said fluid and the fluid above; directly supplying heat to the element; exciting the temperature sensitive element to luminescence; and detecting the electromagnetic radiation emitted by the element to detect the temperature of the element, said temperature being an indication of the level between the fluids as it changes.
Claim 87
Independent Claim
109 words
An apparatus for measuring the thermal conductivity of a solid sample comprising: a length of optical fiber; a temperature sensitive element held at a first end of said optical fiber, said element having temperature sensitive luminescent properties and being adapted to contact one side of the solid sample; a radiation heat transfer means for directly supplying heat to the element; means at a second end of the optical fiber for exciting said temperature sensitive element; and means at said second end of the optical fiber for detecting electromagnetic radiation emitted by said element to detect the temperature of the element which indicates the thermal conductivity of the solid sample.
Claim 88
Independent Claim
109 words
An apparatus for measuring the thermal conductivity of a solid sample comprising: a length of optical fiber; a temperature sensitive element held at a first end of said optical fiber, said element having temperature sensitive luminescent properties and being adapted to contact one side of the solid sample; a radiation heat transfer means for directly supplying heat to the element; means at a second end of the optical fiber for exciting said temperature sensitive element; and means at said second end of the optical fiber for detecting electromagnetic radiation emitted by said element to detect the temperature of the element which indicates the thermal conductivity of the solid sample.
Claim 89
Dependent Claim
44 words
The apparatus of claim 66 further comprising a heat sink adapted to contact a solid sample on a side opposite to that in contact with said element so that a steady temperature gradient may be maintained in the sample for measuring its thermal conductivity.
Claim 90
Dependent Claim
76 words
The apparatus of claim 66 wherein the thermal capacity of said element is much smaller than that of the solid sample and wherein the radiation heat transfer means is such that the heat supplied to the solid sample through the element does not significantly change the temperature of most of the solid, so that the temperature of the phosphor element is an indication of the thermal conductivity of the material of which the sample is composed.
Claim 91
Independent Claim
25 words
The apparatus of claims 25, 30, 34, 38, 42, 48, 51, 55, 57 or 66 wherein the temperature sensitive element includes phosphor in its composition.
Claim 92
Dependent Claim
33 words
The apparatus of claim 69 further comprising means for detecting the intensities of radiation at two distinct wavelengths from the phosphor in said element to determine the temperature of the temperature sensitive element.
Claim 93
Dependent Claim
30 words
The apparatus of claim 69 further comprising means for detecting the luminescent response of the phosphor in said element over time to determine the temperature of the temperature sensitive element.
Claim 94
Dependent Claim
23 words
The apparatus of claim 71, wherein said luminescent response detecting means detects a parameter related to the luminescent decay time of the phorphor.
Claim 95
Independent Claim
99 words
The apparatus of claims 25, 30, 34, 42, 48, 51, 55, 57 or 66 wherein the temperature sensitive element includes phosphor in its composition and wherein said radiation heat transfer means comprises: an optical filter that absorbs infrared light but transmits light emitted by the phosphor upon excitation, said filter placed between said first end and the element and in heat conductive relationship with the element; and infrared light source for supplying infrared light to said second end which is then transmitted by the optic fiber to its first end for heating the element by heating the optical filter.
Claim 96
Independent Claim
38 words
The apparatus of claims 30, 34, 38, 42, 48, 51, 55, 66 or 68 wherein said element includes phosphor in its composition and wherein said means for exciting said temperature sensitive element comprises a source of ultraviolet light.
Claim 97
Dependent Claim
118 words
The apparatus of claim 74, wherein said radiation heat transfer means comprises an infrared light source, said apparatus further comprising four additional lengths of optical fibers in optical communication with said length of optical fiber, the four additional lengths of optical fibers being so spatially oriented that a first additional optical fiber is used to transmit ultraviolet or visible light from the exciting means to said element, a second additional optical fiber transmits infrared light from the infrared light source to said optical filter, a third and a fourth additional optical fiber for transmitting the electromagnetic transmission from said element to detectors for detecting the intensities of radiation at two distinct wavelengths from the phosphor in said element.
Claim 98
Independent Claim
74 words
A method for measuring the thermal conductivity of a solid sample with an element having temperature sensitive luminescent properties, said method comprising: contacting one side of the solid sample with the element; directly supplying heat to the element; exciting said temperature sensitive element to luminescence; and detecting the electromagnetic radiation emitted by said element to detect the temperature of the element, said temperature being an indication of the thermal conductivity of the solid sample.
Claim 99
Independent Claim
74 words
A method for measuring the thermal conductivity of a solid sample with an element having temperature sensitive luminescent properties, said method comprising: contacting one side of the solid sample with the element; directly supplying heat to the element; exciting said temperature sensitive element to luminescence; and detecting the electromagnetic radiation emitted by said element to detect the temperature of the element, said temperature being an indication of the thermal conductivity of the solid sample.
Claim 100
Independent Claim
125 words
A method for improving the accuracy of temperature measurement wherein the measurement apparatus comprises a temperature probe housing, a temperature sensitive element held at the probe tip of said housing and means for determining the temperature of said element when said element is held in contact with a sample the temperature of which is to be measured, said method comprising: determining the approximate temperature of the sample; directly heating, through radiation, the probe tip and the temperature sensitive element to a temperature substantially equal to the approximate temperature of the sample to reduce the heat transfer between the probe tip and the element when they are placed in contact; and bringing said element into contact with the sample and measuring the temperature of the sample.
Claim 101
Independent Claim
125 words
A method for improving the accuracy of temperature measurement wherein the measurement apparatus comprises a temperature probe housing, a temperature sensitive element held at the probe tip of said housing and means for determining the temperature of said element when said element is held in contact with a sample the temperature of which is to be measured, said method comprising: determining the approximate temperature of the sample; directly heating, through radiation, the probe tip and the temperature sensitive element to a temperature substantially equal to the approximate temperature of the sample to reduce the heat transfer between the probe tip and the element when they are placed in contact; and bringing said element into contact with the sample and measuring the temperature of the sample.
Claim 102
Dependent Claim
23 words
The probe apparatus of claim 25 further comprises means at the second end of the optic fiber for exciting said temperature sensitive element.
Claim 103
Dependent Claim
29 words
The apparatus of claim 57 wherein said element includes phosphor in its composition and wherein said means for exciting said temperature sensitive element comprises a source of ultraviolet light.
References Cited (Backward Citations)
US673075A
Cited
US3251228A
Cited
US3580081A
Cited
US3797310A
Cited
US3917945A
Cited
US4016761A
Cited
DE2445804A1
Cited
US4140393A
Cited
US4204119A
Cited
US4075493A
Cited
US4136566A
Cited
US4179927A
Cited
US4215275A
Cited
US4448547A
Cited
US4223226A
Cited
US4403143A
Cited
US4345482A
Cited
US4313344A
Cited
US4344315A
Cited
US4355910A
Cited
US4320650A
Cited
US4344322A
Cited
US4295739A
Cited
US4245507A
Cited
US4376890A
Cited
US4357106A
Cited
US4458709A
Cited
US4373768A
Cited
US4384484A
Cited
US4417140A
Cited
US4362057A
Cited
US4374328A
Cited
GB2113837A
Cited
EP0085875A2
Cited
US4435978A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1989-11-10 | 1990-05-12 | 1990-11-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-11-10 | 1994-05-12 | 1994-11-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-11-10 | 1998-05-12 | 1998-11-11 | $7700.00 | Window Closed / Lapsed |