Thermal image detector with fast shutter period, and method of o

Details Thermal image detector with fast shutter period, and method of o Thermal image detector with fast shutter period, and method of o

1993-12-28

1995-07-11

Dzierzynski, Paul M.

Radiant energy

Infrared-to-visible imaging

2503383, G01J 562

Patent

active

054323487

ABSTRACT:
The disclosure relates to thermal image detectors and, more particularly, to linear or matrix type pyroelectic detectors. These detectors work differentially, in successive phases of masking and illumination, by use of a shutter that is synchronized with the signal processing circuits. The detected signals are shed in the form of charge packets into a shift register (RD). To reduce the noises that are proportional to the duration of the illumination or masking phases, the shutter is made to work at higher speed and several successive illumination/masking cycles are carried out by making the shift register go backward between two cycles. The shift register is emptied to give an image signal only after two or more cycles.

REFERENCES:
patent: 3849651 (1974-11-01), Ennulat
patent: 3979604 (1976-09-01), Bate
patent: 4072863 (1978-02-01), Roundy
patent: 5262647 (1993-11-01), Kumada
patent: 5283438 (1994-02-01), Dautriche

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