Infrared scanning and display system having a noncontacting angl

Details Infrared scanning and display system having a noncontacting angl Infrared scanning and display system having a noncontacting angl

1977-10-28

1979-05-01

Kominski, John

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250237G, 250347, G01D 540

Patent

active

041525884

ABSTRACT:
A scanning mirror position sensor operable from the back side of a scanning mirror which utilizes the front side of the mirror for scanning a scene to be interrogated or displayed. A rectangular uniformly distributed light source is reflected from the back surface of the scanning mirror across a grating consisting of alternate transparent and opaque regions placed in the focal plane in front of a single large area photodetector. As the light from the light source sweeps across the grating, the detector is alternately energized and deenergized to form a serial pulse train which is coupled to a pulse counter which accumulates the pulse count to thereby provide a continual and accurate measure of the mirror position.

REFERENCES:
patent: 3068361 (1962-12-01), Lannan
patent: 3364813 (1968-01-01), McKinney

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