Radiant energy – Invisible radiant energy responsive electric signalling – Infrared responsive
Patent
1997-05-14
2000-01-11
Westin, Edward P.
Radiant energy
Invisible radiant energy responsive electric signalling
Infrared responsive
2503381, G01J 506
Patent
active
060139145
ABSTRACT:
A circuit for detecting electromagnetic radiation such as infrared radiation includes one or more sensor elements which convert the electromagnetic radiation into an electric signal. A field effect transistor receives the electric signal of the sensor elements. An impedance which is ohmic, inductive, or both is connected between the supply voltage and the field effect transistor to filter high frequencies so that false detections by the detecting circuit are eliminated.
REFERENCES:
patent: 4626687 (1986-12-01), Nora et al.
patent: 4697081 (1987-09-01), Baker
patent: 4933559 (1990-06-01), Tamura et al.
Boylestad et al. "Electronic Devices and Circuit Theory" p. 630, 1972.
Hanig Richard
Heimann Optoelectronics GmbH
Westin Edward P.
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