Radiation detector with remote temperature reference

Details Radiation detector with remote temperature reference Radiation detector with remote temperature reference

1993-04-02

1994-06-07

Dzierzynski, Paul M.

Radiant energy

Invisible radiant energy responsive electric signalling

Infrared responsive

2503381, G01J 526

Patent

active

053192028

ABSTRACT:
A radiation detector employs a thermopile having a potentiometer for calibrating the thermopile output to best suit a particular output meter and sensing application. A thermocouple may be connected in series with the thermopile. The output of the thermopile is calibrated to best match a linear function which intersects the thermopile output function at a temperature in the center of a temperature range of interest. A total output signal of the detector is the sum of the thermopile signal and the thermocouple signal, and is indicative of the temperature of a target emitting radiation sensed by the thermopile. The series connection of the thermopile and the thermocouple allow the thermopile hot junction temperature to be referenced to the cold junction temperature of the thermocouple. Thus, the reference temperature may be remote from the thermopile sensor. A filtering lens may be used to prevent short wavelength radiation from reaching the thermopile sensor, improving the linearity of the thermopile response. Two detectors may be connected differentially to provide a differential output indicative of the temperature difference between two targets. Additionally, a temperature dependent variable resistor may be coupled to the thermopile, providing a variable resistance that combines with the thermopile output response to produce a linearized thermopile output response. Then, the total output signal of the detector for a particular target temperature is independent of fluctuations in local temperature.

REFERENCES:
patent: 4623266 (1986-11-01), Kielb
patent: 4682898 (1987-07-01), Janssen
patent: 4722612 (1988-02-01), Junkert et al.
patent: 4790324 (1988-12-01), O'Hara et al.
patent: 4895164 (1990-01-01), Wood
patent: 4932789 (1990-06-01), Egawa et al.
patent: 5229612 (1993-07-01), Pompei
Willard et al., "Instru. Meth. of Analysis" D. Van Nostrand Comp. (1981) p. 79.
Patent Abstracts of Japan, vol. 10, No. 241, (p. 488) (2297) Aug. 20, 1986, & JP, A, 61071326 (Fujitsu), Apr. 12, 1986, see abstract.

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