Radiant energy – Infrared-to-visible imaging – Including detector array
Patent
1993-12-10
1995-08-29
Hannaher, Constantine
Radiant energy
Infrared-to-visible imaging
Including detector array
250330, 2503383, 250351, G01J 510
Patent
active
054462835
ABSTRACT:
A thermal image detector and, more particularly, linear or matrix pyroelectric detectors. These detectors work differentially in successive phases of illumination and masking via a shutter that is synchronized with signal processing circuits. The detector generates differential measurement signals representing variations of pyroelectric signals recorded during a cycle comprising a masking phase and an illumination phase. To eliminate fixed pattern noise, it is proposed to make the measurements by difference between two successive cycles of masking and illumination, the order of the illumination/masking cycles being reversed between the two cycles but the measurements being made identically in both cycles. A memory records the signals during a cycle. A subtractor subtracts the signal of the current cycle from the signal recorded in the previous cycle.
REFERENCES:
patent: 4072863 (1978-02-01), Roundy
patent: 4115692 (1978-09-01), Balcerak et al.
patent: 4866275 (1989-09-01), Jaeger et al.
Hannaher Constantine
Thomson-CSF Semiconducteurs Specifiques
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