Laser radiation protected horizon sensor with successive reststr

Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system

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250347, 350642, H01J 314

Patent

active

049142879

ABSTRACT:
A horizon sensor which senses the horizon and produces a signal which indicates orientation with respect thereto is provided for scanning the horizon or distant line of discontinuity in optical radiation by a detector sensitive to such radiation and using the signals generated by the detector in crossing the line of discontinuity in optical radiation for attitude control of moving bodies. A scanner for the detector has two successive reflecting elements in optical alignment with the detector for reflectively applying predetermined optical radiation from a scanned field of view which includes the line of discontinuity in optical radiation. Reststrohlen mirrors which absorb and transmit predetermined laser radiation and reflect said predetermined optical radiation comprise the two successive reflecting elements which perform the scanning for protecting the horizon sensor from laser radiation damage by preventing the application of the laser radiation from reaching the detector or other sensitive components of the horizon sensor.

REFERENCES:
patent: 4088884 (1978-05-01), Rast et al.
patent: 4328421 (1982-05-01), Falbel
patent: 4772080 (1988-09-01), Tustison

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