Radiant energy – Photocells; circuits and apparatus – Photocell controls its own optical systems
Patent
1989-05-11
1990-07-24
Westin, Edward P.
Radiant energy
Photocells; circuits and apparatus
Photocell controls its own optical systems
356121, G01J 120
Patent
active
049437097
ABSTRACT:
An adaptive optics system is disclosed which has a phase detector to detect phase distortions acquired by an input beam, and a separate phase adjustor which predistorts a transmission beam so that it is restored to its proper phase during transmission back through the same medium travelled by the input beam. The phase adjustor consists of a liquid crystal mechanism with an area substantially greater than that of the phase detector, thereby permitting high power operation. Liquid crystal pixels in the phase adjustor have dual transistor signal storage circuits which apply operating signals to the pixels without significant decay or flicker. The phase adjustor can be constructed in either a reflective or transmissive mode. Two phase adjustors may be placed in series to enhance response time and/or process an unpolarized beam. A data processor interfaces between the phase detector and phase adjustor. The data processor may include a capability for providing phase adjustment information for a plurality of transmission wavelengths based upon the detected distortion of an input beam at only one of the wavelengths.
REFERENCES:
patent: 4141652 (1979-02-01), Feinleib
patent: 4537471 (1985-08-01), Grinberg et al.
patent: 4725138 (1988-02-01), Wirth et al.
John Hardy, "Active Optics: A New Technology for the Control of Light", Proc. of IEEE, vol. 66, No. 6, Jun. 1979, pp. 651-697.
Charles Apt, "Perfecting the Picture", IEEE Spectrum, Jul. 1985, pp. 60-66.
A. I. Lakatos, "Promise and Challenge of Thin-Film Silicon Approaches to Active Matrices", 1982 Int'l Display Research Conf., pp. 146-151.
S. Sherr, "Electronic Displays", A Wiley-Interscience Publication, pp. 304-311.
Grinberg Jan
O'Meara, Jr. Thomas R.
Welkowsky Murray S.
Beck George C.
Coble Paul M.
Denson-Low Wanda K.
Duraiswamy V. D.
Hughes Aircraft Company
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