Automatic initiation of target crossover recovery in a pyroelect

Details Automatic initiation of target crossover recovery in a pyroelect Automatic initiation of target crossover recovery in a pyroelect

1986-07-28

1987-08-11

Britton, Howard W.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

250333, 250334, 358163, H04N 533

Patent

active

046865667

ABSTRACT:
A system and method are disclosed for initiating target crossover recovery in a pyroelectric camera by electronically detecting crossover and automatically initiating recovery in response thereto. The video signal appearing at the output of the video amplifier during readout of the vidicon tube is coupled to a level detector to detect crossover by sensing a positive signal having an amplitude greater than any such signal producible during readout arising from an optical input to the video amplifier, with reliability of detection being enhanced by use of an automatic balancing circuit providing a stable reference. The output from the level detector, indicative of sensed crossover of an area (or all) of the target of the pyroelectric tube, is either directly used to trigger an automatic target poling circuit which returns the pyroelectric tube back to normal operation, or is coupled to a time delay for delaying repoling of the target to allow an image to continue for a period of time after an area of the target has been crossed over in order to avoid loss of information.

REFERENCES:
patent: 4031394 (1977-06-01), Felix
patent: 4072863 (1978-02-01), Roundy
patent: 4100574 (1978-07-01), Felix
patent: 4177483 (1979-12-01), Felix
patent: 4225882 (1980-09-01), Moiroud
patent: 4288817 (1981-09-01), Igel
patent: 4437118 (1984-03-01), Singer
patent: 4481535 (1984-11-01), Hodd

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