Radiant energy – Invisible radiant energy responsive electric signalling – Infrared responsive
Patent
1986-09-26
1988-07-05
Anderson, Bruce C.
Radiant energy
Invisible radiant energy responsive electric signalling
Infrared responsive
2502521, 340567, 340600, G01J 510
Patent
active
047556749
ABSTRACT:
An infrared detector has at least one infrared-sensitive detector element and at least one infrared source disposed in a common housing with the detector, with the infrared radiation from the source being directed onto the detector element. A pulse generator is connected to the infrared source for pulsing the infrared radiation therefrom. A recognition circuit is connected to the detector element for identifying the pulse sequence of the detector output so as to continuously check the functioning of the detector. A number of such detector elements can be arranged in the housing, with each detector element having a respective infrared source associated therewith. The infrared source may be a heated wire, a chip resistor, or a light emitting diode.
REFERENCES:
patent: 4441023 (1984-04-01), Doctor et al.
patent: 4464575 (1984-08-01), Cholin et al.
patent: 4636643 (1987-01-01), Nakamurz et al.
patent: 4677294 (1987-06-01), Spector et al.
Anderson Bruce C.
Guss Paul A.
Heimann GmbH
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