The Marconi Company Limited

Gec Avionics Limited

Andrew De Fremont

Bias current to an array of detectors is switched off during periods when the detectors are fruitlessly receiving energy from inside the image housing to either side of an optical aperture thereof. This reduces the generation of heat in the detectors.

Infra-red imager

A telecine apparatus uses a line array electro-optical image transducer which is illuminated with bias light in addition to the projection light passing through the film. The bias light serves to operate the transducer on a linear portion of its characteristic, and the bias light is pulsed on during the integration periods of the transducer so as to give an accurate and reproducible control of the bias value. The transducer itself has a controllable variable integration period.

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Chelmsford, United Kingdom

Andrew De Fremont