Radiant energy – Photocells; circuits and apparatus – Photocell controls its own optical systems
Patent
1985-02-06
1987-01-27
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Photocell controls its own optical systems
356354, G01J 120, G01B 902
Patent
active
046395865
ABSTRACT:
An apparatus and technique are described for phasing the outputs of a multiplier telescope array used as a laser transmitter. The technique uses samples of the transmitted beams to control optical path lengths through the separate telescopes so that the beams add coherently at the receiver. The phasing concept is applicable both to systems which provide inputs to the multiple telescopes by dividing a single laser beam and to systems in which the inputs to the telescopes and multiple, phase-locked laser beams. The approach is also compatible with single line and multi-line lasers, and it does not entail stringent alignment requirements. The concept uses a procedure to find the zero optical path difference condition and to effect fine control of the optical path lengths through the different telescopes. Algorithms are described for estimating the phase mismatch from focal plane measurements.
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A. B. Meinel, "Aperture Synthesis Using Independent Telescopes", Applied Optics, Nov. 1970, vol. 9, No. 11, pp. 2501-2504.
Butts Robert R.
Cusumano Salvatore J.
DeHainaut Christopher R.
Fender Janet S.
Auton William G.
Messinger Michael
Nelms David C.
Singer Donald J.
The United States of America as represented by the Secretary of
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