Noncontacting thermometer

Details Noncontacting thermometer Noncontacting thermometer

1997-03-25

2000-04-11

Fulton, Christopher W.

Thermal measuring and testing

Temperature measurement

In spaced noncontact relationship to specimen

2503381, 374133, 374170, G01J 520

Patent

active

060480920

ABSTRACT:
This invention concerns a noncontacting type thermometer which is improved in sensitivity of detection and accuracy of measurement and meanwhile adapted to prevent a thermistor element itself from self-generation of heat. A pulse voltage generating circuit 15 generates a pulse voltage of a rectangular waveform having a pulse wave height, a pulse width, and a pulse cycle enough to render negligible the effects of the self-generation of heat of a thermistor bolometer element in accordance with the thermal capacity of the thermistor bolometer. A detecting circuit 20 admits the pulse voltage, generates a differential voltage arising from a change in the magnitude of resistance corresponding to the amount of an incident infrared radiation of an infrared radiation detecting thermistor bolometer element RA, and amplifies this differential voltage by means of a differential amplifier 24. A voltage adding circuit 30 admits a pulse voltage generated from the differential amplifier 24 synchronously with the pulse cycle of the pulse voltage generated from the pulse voltage generating circuit 15 and adds a prescribed number of pulses of the pulse voltage to produce an ultimate measured voltage.

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Proceedings of the Nuclear Science Symposium and Medical Imaging Conference, Santa Fe, Nov. 2-9, 1991, vol. 2 of 3, Nov. 2, 1991, Institute of Electrical and Electronics Engineers, pp. 1169-1172, XP000348017 Devlin M., et al: "A DC-Coupled, High Sensitivity Bolometric Detector System for the Infrared Telescope in Space."

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