Radiant energy – Photocells; circuits and apparatus – Photocell controls its own optical systems
Patent
1977-05-31
1978-12-12
Dahl, Lawrence J.
Radiant energy
Photocells; circuits and apparatus
Photocell controls its own optical systems
244176, 356152, G01J 120
Patent
active
041297750
ABSTRACT:
An imaging detector system for improving the lock-on stability of an optical system and in particular a multi-dither coat system. A quadrant non-coherent detector is disposed beneath a variable stop iris for receiving focused light from a target. The quadrant detector generates a signal in each quadrant sensor region which has a value proportional to the intensity of the light impinging on that sensor region. The signals so generated are processed in a signal processor to generate x-y steering command signals which drive a motor which in turn drives a slewing mirror so that the area of the quadrant detector upon which the greatest light intensity occurs is centered relative to the iris aperture when viewed in the direction of the return optical energy. When the high-intensity region is centered, the aperture of the variable stop iris is decreased to prevent the problem of glint jump.
REFERENCES:
patent: 3268185 (1966-08-01), Eckermann, Jr.
patent: 3286953 (1966-11-01), Meisenholder
patent: 4020340 (1977-04-01), Cooke
Coldrick - "Optical Sensors for Spacecraft Attitude Determination - Optics & Laser Technology, pp. 129-141; Jun. 1972.
Dahl Lawrence J.
Hughes Aircraft Company
Link, Jr. Lawrence V.
MacAllister W. H.
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