Infra red photo detector systems

Details Infra red photo detector systems Infra red photo detector systems

G - Physics

08

C

340/155.2

G08C 21/00 (2006.01) G01B 11/00 (2006.01) H01L 31/09 (2006.01)

Patent

CA 1248199

ABSTRACT An infra red photo detector system comprises a piece of detector material, such as CdxHgl-xTe, InSb, InAs, egc, carrying at least a pair of spaced electrodes. An optical arrangement directs a small spot of radiation onto the detector. The position of the small spot on the much larger detector is found by applying an electrical bias between the electrodes causing a drift of photo carriers. The bias may be of alternating polarity and the detector output measured at each polarity. Alternatively, a high frequency bias may be applied and the A.C. offset from the detector used to indicate spot position. Alternatively the spot position may be modulated or swept along the detector by a mirror moving in a saw tooth scanning action.

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