Infrared target image system employing rotating polygonal mirror

Details Infrared target image system employing rotating polygonal mirror Infrared target image system employing rotating polygonal mirror

1985-03-21

1987-03-17

Westin, Edward P.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

350 65, 350 67, 350 68, H01J 314, G02B 2608

Patent

active

046509976

ABSTRACT:
A rotating polygonal mirror which scans a target both vertically and horizontally in a raster scan electromagnetic illumination or detection system is disclosed. The rotating mirror includes a plurality of individual planar facets disposed around the periphery of the mirror. The facets are arranged so that each of them intersects the principal axis of rotation of the mirror at a predetermined angle characteristic of the particular facet. A perpendicular to each facet drawn from the substantial center of the facet in its horizontal dimension passes through the axis of rotation. By this geometry, a target is scanned by horizontal scan lines in a manner which is equivalent to prior art mirrors having a plurality of facets all of which are parallel to the axis of rotation, and the vertical stepping of the raster scan is accomplished by stepping between adjacent facets of the mirror having distinct angles of intersection with the axis of rotation. An infrared, raster scan detection system in which a plurality of parallel horizontal scan lines are scanned by each facet of the mirror is also disclosed.

REFERENCES:
patent: 4520504 (1985-05-01), Walker et al.

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