Thermal detector

Details Thermal detector Thermal detector

1989-12-27

1990-08-14

Howell, Janice A.

Radiant energy

Invisible radiant energy responsive electric signalling

Infrared responsive

2503384, 250332, G01J 520

Patent

active

049489631

ABSTRACT:
A thermal detector comprises a thin film diode transistor coated with infrared absorbent material, and mounted on a thermally insulating support such as silicon oxide, foam glass or foam plastics material. The support may be recessed to improve insulation. The detector may be an array of diodes or transistors, and the diodes may be LEDs. Addressing may be line-by-line or co-ordinate selection. A transistor detector array may be arranged for signal integration and sample switching. A chopper may be used to modulate radiation illuminating the detector, whose output is fed to subtractive circuitry. Alternatively, a transistor detector array may incorporate additional transistors for bias current subtraction, each detecting transistor forming a long-tailed pair configuration with a respective additional transistor.

REFERENCES:
patent: 2977477 (1961-03-01), Rosi et al.
patent: 3891993 (1975-06-01), Beneking
patent: 4142925 (1979-03-01), King et al.
patent: 4224520 (1980-09-01), Greene et al.
patent: 4242706 (1980-12-01), McCormack et al.
patent: 4360732 (1982-11-01), Chapman et al.
Lynch et al., "Optical Transducer" (250/338 SE) IBM Tech. Discl. Bull. vol. 12, No. 6, (Nov.-69) p.875.
Thom et al., "InSb CCDs & Other MIs Devices . . . " 1975 Intern. Conf. on the Appli. of CCDS San Diego, Calif. Oct./75.

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