Radiant energy – Photocells; circuits and apparatus – Photocell controls its own optical systems
Patent
1990-06-15
1991-06-25
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Photocell controls its own optical systems
356353, G01J 120
Patent
active
050269771
ABSTRACT:
A closed loop system sends one portion of a coherent laser beam along a first path and another portion of the beam along a second path which is directed at a mirror formed on piezoelectric membrane. After reflection, both return beams are mixed on a photodetector array and the array output is analyzed to determine the values of a charge distribution on the piezoelectric membrane which will null or maintain constant the phase of the mixed beam.
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Allen Stephone
Nelms David C.
The Charles Stark Draper Laboratory Inc.
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