New detector for thermal imaging systems

Physics – Optics

Scientific paper

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Imaging Techniques, Infrared Detectors, Semiconductor Devices, Thermal Mapping, Cryogenic Equipment, Fabrication, Mercury Cadmium Tellurides

Scientific paper

An infra-red device which performs both the detection and time delay integration functions in serial or serial-parallel scan thermal imaging systems is described. The device consists of a strip of n-type cadmium mercury telluride the dimensions of which are determined by the system optics and scan speed. A constant current provides bias through the two ohmic end contacts, and the third contact, also ohmic, is a potential probe for signal read-out. The bias field is sufficiently high for excess minority carriers generated optically over a significant fraction of the filament length to reach the negative end contact before recombination occurs in the bulk. The device provides reduced electronic complexity, simplified detector fabrication, and simplified cryogenic encapsulations with fewer electrical leads.

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