EP0222555A2
Expired / Lapsed
EP
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Optical fiber transducer driving and measuring circuit and method for using same
Assignee: Deseret Medical Inc
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Filing: 1986-10-29
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Granted: —
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Expires: 2006-10-29
Abstract
Abstract An optical fiber transducer system with energy generating means for transmitting pulsing energy at various frequencies to bi-directional couplers for each frequency. The couplers record the intensity and further transmit the pulsing energy to a wavelength multiplexer/demultiplexer. The wavelength multiplexer/demultiplexer combines the plurality of energy supply means into a single output for an optic fiber which includes an optical delay sufficient to time separate the pulsing waves of energy. Reflected energy is transmitted back through the same wavelength multiplexer/demultiplexer, bi-directional coupler so that the recorded intensity of transmission and reflectance are comparable without system influence. A method is also shown for use of an optical fiber system including the components set forth and the system requires the generation and combination of the various frequencies of energy in a multiplexer/demultiplexer, the delay for time separation and the detection in a bi-directional coupler of transmitted and reflected energy.
Inventors
- 👤 Steven H. Mersch
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-25 16:04
CPC Classifications
A; A61; A61B; A61B5/00; A61B5/145; A61B5/1455; A61B5/14551; G; G01; G01N; G01N21/00; G01N21/17; G01N21/25; G01N21/31; G01N21/314; G01N2021/3181; G01N2201/00; G01N2201/06; G01N2201/062; G01N2201/0621; G01N2201/08
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
193 words
An optical fiber transducer system for measurement of a parameter of a test medium by transmitting energy and comparing same to energy reflected by the medium characterised in that it comprises: a first energy source connected to a power supply for emitting bursts of energy at a predetermined colour frequency; a second energy source connected to said power supply for emitting bursts of energy at another predetermined colour frequency; a wavelength division multiplexer/demultiplexer a ssociated with said first and second energy sources for receipt of said bursts of energy, for combination of same and further transmission thereof while maintaining their discrete colour frequencies and for separation of the reflective energy of same into individual channels of each colour frequency upon return of said bursts of energy; fiber optic means and associated optical delay means, arranged for receipt of said combined bursts of energy and transmission of same to and for the carrying of the reflectance of same from a test medium and for extending the distance of said transmission and said reflectance in order to permit time separation of adjacent burst of transmitted and reflected energy for purposes of discrete measurement of same.
Claim 2
Dependent Claim
193 words
An optical fiber transducer system for measurement of a parameter of a test medium by transmitting energy and comparing same to energy reflected by the medium characterised in that it comprises: a first energy source connected to a power supply for emitting bursts of energy at a predetermined colour frequency; a second energy source connected to said power supply for emitting bursts of energy at another predetermined colour frequency; a wavelength division multiplexer/demultiplexer a ssociated with said first and second energy sources for receipt of said bursts of energy, for combination of same and further transmission thereof while maintaining their discrete colour frequencies and for separation of the reflective energy of same into individual channels of each colour frequency upon return of said bursts of energy; fiber optic means and associated optical delay means, arranged for receipt of said combined bursts of energy and transmission of same to and for the carrying of the reflectance of same from a test medium and for extending the distance of said transmission and said reflectance in order to permit time separation of adjacent burst of transmitted and reflected energy for purposes of discrete measurement of same.
Claim 3
Dependent Claim
176 words
An optical fiber transducer system according to Claim 1 in which said fiber optic means is attached to said wavelength division multiplexter/demultiplexer for first receipt of said combined bursts of energy and transmission of same to and for the carrying of the reflectance of same from the test medium; and said optical delay means extends the distance of said transmission and said reflectance in order to permit time separation of adjacent bursts of transmitted and reflected energy for purposes of discrete measurements of same; detector means independently associated respectively with each of said first and second energy sources for initially measuring and storing the level of said bursts of energy during transmission and the subsequent measuring and storing of said reflected energy of said burst of energy for comparison of each, and computer means for establising the timing of said bursts of energy and receipt of said detected level of energy transmitted and reflected to establish the actual percent reflected for a specific burst of energy for each of said first and second predetermined colour frequencies.
Claim 4
Dependent Claim
90 words
An optical fiber transducer system according to Claim 1 in which an optical delay means are attached to said wavelength division multiplexer/demultiplexer for extending the distance of travel for said bursts of energy in order to permit time separation of adjacent bursts of transmitted and reflected energy for purposes of discrete measurement of same; and said fiber optic means is arranged for first receipt of said combined bursts of energy from said multiplexer/demultiplexer and transmission of same to and for return of the reflectance of same from the test medium.
Claim 5
Dependent Claim
38 words
An optical fiber transducer system according to any of Claims 1 to 3 wherein said colour frequencies are about 660 nm and 840 nm respectively and the test medium is blood and the measured parameter is oxygen saturation.
Claim 6
Dependent Claim
72 words
An optical fiber transducer system according to any of Claims 1 to 4 wherein said fiber optic means is in series with said optical delay means and the combination of same is long enough to allow the time necessary for said computer means to determine the transmitted and reflected energy by time delay separation between the two resulting from the increased distance of travel necessary for the transmitted and reflected energy pulses.
Claim 7
Dependent Claim
45 words
An optical fiber transducer system according to any of Claims 1 to 5 wherein said computer means triggers said power supply to establish said bursts of energy for the transmitted wave and compares that energy with the energy received from the reflectance of that wave.
Claim 8
Dependent Claim
22 words
An optical fiber transducer system accoring to any of Claims 1 to 6 wherein there are a plurality of said energy sources.
Claim 9
Dependent Claim
114 words
An optical fiber excitation and measuring system characterised in that it comprises: a plurality of energy supplying means for generating and transmitting pulsing energy at various frequencies each said means connected to a bi-directional coupler for detecting the intensity and further transmitting said pulsing energy to a wavelength multiplexer/demultiplexer for combining said plurality of pulsating energy waves into a single outp ut; optic means including an optical delay sufficient to separate and extend the length of time for travel of said combined pulsating wave energy and a disposable fiber optic connected to said optical delay and for placement into a test medium thereby transmitting said pulsating energy waves to and from the test medium.
Claim 10
Dependent Claim
114 words
An optical fiber excitation and measuring system characterised in that it comprises: a plurality of energy supplying means for generating and transmitting pulsing energy at various frequencies each said means connected to a bi-directional coupler for detecting the intensity and further transmitting said pulsing energy to a wavelength multiplexer/demultiplexer for combining said plurality of pulsating energy waves into a single outp ut; optic means including an optical delay sufficient to separate and extend the length of time for travel of said combined pulsating wave energy and a disposable fiber optic connected to said optical delay and for placement into a test medium thereby transmitting said pulsating energy waves to and from the test medium.
Claim 11
Dependent Claim
40 words
An optical fiber excitation and measuring system according to Claim 8 wherein said wavelength multiplexer/demultiplexer receives reflected energy through said disposable fiber optic and separates said plurality of pulsating energy waves into discrete wavelengths and transmitted to said bi-directional coupler.
Claim 12
Dependent Claim
22 words
An optical fiber excitation and measuring system according to Claim 8 or 9 wherein said bi-directional coupler detects reflected pulsating energy waves.
Claim 13
Dependent Claim
43 words
An optical fiber excitation and measuring system according to any of Claims 8 to 10 wherein said bi-directional coupler is situated between said plurality of power supplies and said multiplexer/demultiplexer so that said pulsing energy is detected upon transmittance and again upon reflectance.
Claim 14
Dependent Claim
37 words
An optical fiber excitation and measuring system according to any of Claims 8 to 11 wherein said detected energy is compared in a computer with capacity to store, associate and read out the measurement of said energy.
Claim 15
Independent Claim
196 words
A method of using an optical fiber transducer system for measurement of a parameter of a test medium by transmitting energy and comparing same to energy reflected by the medium characterised in that it includes the following steps: triggering the signal for a power supply in accordance with at least two colour frequencies of timed pulses, generating a pulsing power supply of energy at predetermined colour frequencies in response to said triggering of energy, emitting bursts of light energy at said predetermined colour frequencies in response to said pulsing power supply, detecting said bursts of light at said predetermined colour frequencies as same are transmitted and storing information relative to same, multiplexing said predetermined transmitted light bursts of predetermined colour frequencies into a common output, imposing a delay upon said common transmitted distinct colour frequencies, sending said delayed common output along a fibre optic to a test medium, receiving said colour frequencies reflected from a test medium through said fiberoptic, detecting and storing said reflected colour frequencies with the same detector, and providing the detected information regarding the transmitted and reflected colour frequencies to a computer so that the percentage of reflected energy can be calculated.
Claim 16
Independent Claim
196 words
A method of using an optical fiber transducer system for measurement of a parameter of a test medium by transmitting energy and comparing same to energy reflected by the medium characterised in that it includes the following steps: triggering the signal for a power supply in accordance with at least two colour frequencies of timed pulses, generating a pulsing power supply of energy at predetermined colour frequencies in response to said triggering of energy, emitting bursts of light energy at said predetermined colour frequencies in response to said pulsing power supply, detecting said bursts of light at said predetermined colour frequencies as same are transmitted and storing information relative to same, multiplexing said predetermined transmitted light bursts of predetermined colour frequencies into a common output, imposing a delay upon said common transmitted distinct colour frequencies, sending said delayed common output along a fibre optic to a test medium, receiving said colour frequencies reflected from a test medium through said fiberoptic, detecting and storing said reflected colour frequencies with the same detector, and providing the detected information regarding the transmitted and reflected colour frequencies to a computer so that the percentage of reflected energy can be calculated.
References Cited (Backward Citations)
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