EP0119724A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Dual sensor radiation pyrometer
Assignee: USS Constitution Museum
•
Filing: 1984-02-13
•
Granted: —
•
Expires: 2004-02-13
Abstract
Abstract A pyrometer for determining the temperature of a surface in the presence of reflected radiation has two infrared radiations sensors, each responsive to different wave length, positioned to receive radiation from the surface. An adjustment factor is developed from sensor response signals when reflected radiation and surface temperatures are the same, and is combined with sensor response characteristics over a range of surface and sensor indicated temperatures to develop a correction factor which when multiplied by the indicated temperature provides the actual surface temperature.
Inventors
- 👤 Ralph Gerald Rudolph
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-28 22:05
CPC Classifications
G; G01; G01K; G01K13/00; G01K13/10; G01J; G01J5/00; G01J5/60
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
189 words
A pyrometer for measuring the surface temperature of a heated object in the presence of reflected radiation at a different temperature comprising: a. a first infrared radiation sensor positioned to receive radiation from the surface for providing a first signal indicative of temperature, b. a second infrared radiation sensor, having a response to wave lengths of infrared radiation different than the first sensor, positioned to generally receive radiation from the same surface area as the first sensor for providing a second signal indicative of temperature, c. means connected to the first and second sensors for providing an adjustment factor responsive to the sensor signals and the response characteristics of the sensors, said adjustment factor being zero when the reflected radiation temperature and surface temperatures are the same, d. means connected to the means for providing an adjustment factor for providing a correction factor responsive to the adjustment factor and the response characteristics of the sensors, and e. means connected to the means for providing the correction factor and one of said signals for providing an indication of the surface temperature when the correction factor is multiplied by said signal.
Claim 2
Dependent Claim
189 words
A pyrometer for measuring the surface temperature of a heated object in the presence of reflected radiation at a different temperature comprising: a. a first infrared radiation sensor positioned to receive radiation from the surface for providing a first signal indicative of temperature, b. a second infrared radiation sensor, having a response to wave lengths of infrared radiation different than the first sensor, positioned to generally receive radiation from the same surface area as the first sensor for providing a second signal indicative of temperature, c. means connected to the first and second sensors for providing an adjustment factor responsive to the sensor signals and the response characteristics of the sensors, said adjustment factor being zero when the reflected radiation temperature and surface temperatures are the same, d. means connected to the means for providing an adjustment factor for providing a correction factor responsive to the adjustment factor and the response characteristics of the sensors, and e. means connected to the means for providing the correction factor and one of said signals for providing an indication of the surface temperature when the correction factor is multiplied by said signal.
Claim 3
Dependent Claim
171 words
A pyrometer according to claim 1 in which the means for providing an adjustment factor includes: a. a first amplifier connected to the first sensor for providing a first voltage output responsive to the radiation received by the first sensor, b. a first logarithmic amplifier connected to the first amplifier for providing a logarithmic response to the first voltage output, c. a second amplifier connected to the second sensor for providing a second voltage output responsive to the radiation received by the second sensor. d. a second logarithmic amplifier connected to the second amplifier for providing a logarithmic response to the second voltage out, e. a first function generator, connected to the first logarithmic amplifier and responsive to the first logarithmic response and the response characteristics of the first and second sensors when the reflected radiation and surface temperatures ane the same for providing a calculated value for the second logarithmic response, and f. means connected to the second logarithmic amplifier and the first function generator for providing an adjustment factor.
Claim 4
Dependent Claim
39 words
A pyrometer according to claim 2 which includes a first valley picker circuit connected between the first amplifier and the first logarithmic amplifier and a second valley picker circuit connected between the second amplifier and the second logarithmic amplifier.
Claim 5
Dependent Claim
69 words
A pyrometer according to claim 2 or 3 in which the means for providing a correction factor includes: a. a second function generator for providing a temperature correction factor responsive to the adjustment factor and the response characteristics of the sensors and b. means connected to the second function generator for providing an adjustment to the output of the second generator in accordance with the emittance of the surface.
Claim 6
Dependent Claim
96 words
A pyrometer according to claim 4 in which the means for providing an indication of the surface temperature includes: a. means connected to the first logarithmic amplifier and responsive to the first logarithmic response and the first sensor characteristics for providing a signal indicative of the temperature of the radiation received by the first sensor and b. means connected to the means for providing a temperature correction factor and the means for providing a signal indicative of the temperature of the radiation received by the first sensor for providing a signal indicative of the surface temperature.
Claim 7
Dependent Claim
84 words
A pyrometer according to claim 2 or 3 in which the means for providing a correction factor includes: a. a third function generator for providing a ratio correction factor for the ratio of the first voltage output and the second voltage output and responsive to the adjustment factor and the response characteristics of the sensors, and b. means connected to the third function generator for providing an adjustment to the output of the third function generator in accordance with the emittance of the surface.
Claim 8
Dependent Claim
140 words
A pyrometer according to claim 6 in which the means for providing an indication of the surface temperature includes: a. circuit means connected to the first logarithmic amplifier and the second logarithmic amplifier for providing an output representative of the ratio off the first voltage output and the second voltage output, b. means connected to the means for providing an output representative of the ratio of the first and second voltage outputs, and responsive to the ratio output and the response characteristics of the sensors for providing a signal indicative of the temperature of the radiation received by the sensors, and c. means connected to the means for providing a ratio correction factor and the means for providing a signal indicative of the temperature of the radiation received by the sensors for providing a signal indicative of the surface temperature.
Claim 9
Dependent Claim
76 words
A pyrometer according to claim 2 or 3 in which the means for providing a correction factor includes: a. a fourth function generator for providing a voltage correction factor for the first voltage output and responsive to the adjustment factor and the response characteristics of the sensors, and b. means connected to the fourth function generator for providing an adjustment to the output of the fourth function generator in accordance with the emittance of the surface.
Claim 10
Dependent Claim
99 words
A pyrometer according to claim 8 in which the means for providing an indication of the surface temperature includes: a. circuit means connected to the first amplifier and the means for providing a correction factor for the first voltage output and responsive to the first voltage output and the voltage output correction factor for providing an output representative of a corrected voltage output, and b. means connected to the means for providing a corrected first voltage output and responsive to the corrected first voltage output and the sensor response characteristics for providing a signal indicative of the surface temperature.
Claim 11
Independent Claim
24 words
A method of determining the temperature of a heated surface in the presence of reflected radiation at a different temperature comprising the steps of
Claim 12
Independent Claim
24 words
A method of determining the temperature of a heated surface in the presence of reflected radiation at a different temperature comprising the steps of
Claim 13
Dependent Claim
23 words
placing a first infrared radiation sensor to receive emitted and reflected radiation from the surface and provide a first signal indicative of temperature,
Claim 14
Dependent Claim
23 words
placing a first infrared radiation sensor to receive emitted and reflected radiation from the surface and provide a first signal indicative of temperature,
Claim 15
Dependent Claim
36 words
placing a second infrared radiation sensor, having a response to wavelengths of infrared radiation different than the first sensor, to receive emitted and reflected radiation from the surface and provide a second signal indicative of temperature,
Claim 16
Dependent Claim
36 words
placing a second infrared radiation sensor, having a response to wavelengths of infrared radiation different than the first sensor, to receive emitted and reflected radiation from the surface and provide a second signal indicative of temperature,
Claim 17
Dependent Claim
22 words
deriving an adjusted first signal from the second signal with the emitted and reflected radiation assumed to be at the same temperature,
Claim 18
Dependent Claim
22 words
deriving an adjusted first signal from the second signal with the emitted and reflected radiation assumed to be at the same temperature,
Claim 19
Dependent Claim
15 words
combining the first signal and the adjusted first signal to provide an adjustment factor, and
Claim 20
Dependent Claim
15 words
combining the first signal and the adjusted first signal to provide an adjustment factor, and
Claim 21
Dependent Claim
18 words
combining the adjustment factor and a signal indicative of temperature to provide a signal indicative of surface temperature.
Claim 22
Dependent Claim
18 words
combining the adjustment factor and a signal indicative of temperature to provide a signal indicative of surface temperature.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
Maintenance schedule is calculated for granted US utility patents.