Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1986-07-18
1988-01-05
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
35821316, H04N 314
Patent
active
047178302
ABSTRACT:
An infrared imaging system includes a scanner of infrared radiation emanating from a subject, the radiation being scanned past an array of radiation detectors disposed on a common substrate. A set of amplifiers connecting with a multiplexer is built upon the array of detectors, individual ones of the amplifiers connecting with respective ones of the detectors. Each amplifier is composed of a structure having the components of a charge-coupled device and includes circuitry for pulsing a charge-coupled device repetitively. A transistor switching circuit interconnects a detector with its corresponding charge-coupled device for modulating the magnitude of charge in each charge packet propagating through the device. A pair of integrators is disposed on the common substrate, and a steering circuit steers modulated and unmodulated pulses to alternate ones of the integrators. A subtraction circuit forms the difference of output integrated signals from the integrators to produce amplified detected signals which are substantially free of drift associated with semiconductor material used in fabricating the detectors and the charge-coupled devices. Samples of the detected signals provide pixels in an image of the subject.
REFERENCES:
patent: 4435730 (1984-03-01), Bendell et al.
patent: 4635126 (1987-01-01), Kinoshita
patent: 4651015 (1987-03-01), Nishizawa et al.
Allen Stephone B.
Karambelas A. W.
Nelms David C.
Santa Barbara Research Center
Taylor Ronald L.
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