Radiant energy – Photocells; circuits and apparatus – Photocell controls its own optical systems
Patent
1976-03-08
1977-11-01
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Photocell controls its own optical systems
244 316, 250209, G01J 120
Patent
active
040567206
ABSTRACT:
A relatively large field of view is scanned to derive an indication of a point source, optical energy emitter being in the field of view, without recognizing relatively large, non-point emitters in the field of view. Each detector in an array of linearly, arranged point source detectors generates an output current in response to the energy irradiating it. The detectors have slightly displaced, narrow fields of view which are scanned so that the field of view of each detector traces a relatively narrow, substantially straight line path across the large field of view. The paths traced by a pair of detectors are substantially parallel and close enough to each other to enable the images of large targets to be indicated as undulations having approximately the same wave shape at substantially the same time positions at the outputs of the pair of detectors. Each of a plurality of negative feedback differential operational amplifiers, one for each pair of detectors, includes complementary input and output terminals which are connected to the detectors so that a point source target illuminating one of the detectors is indicated by the polarity of a pulse output of the amplifier. The inputs of the amplifier are connected to spatially arranged detectors in the array so that the large targets are subtracted in the amplifier and are not indicated in the amplifier output. In response to the output signal of each amplifier, an indication is derived to indicate which of the detectors is responsive to a point source.
REFERENCES:
patent: 2939963 (1960-06-01), Rideout
patent: 3311748 (1967-03-01), Volpe et al.
patent: 3353022 (1967-11-01), Schwartz
patent: 3657547 (1972-04-01), Mansfield
patent: 3783271 (1974-01-01), Abbott et al.
patent: 3944814 (1976-03-01), Goto
Miller Joseph D.
Williams, Jr. Louis A.
Cincinnati Electronics Corporation
Nelms David C.
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