Optical: systems and elements – Holographic system or element – Fourier transform holography
Patent
1990-01-18
1992-10-27
Arnold, Bruce Y.
Optical: systems and elements
Holographic system or element
Fourier transform holography
250550, 2502086, 359 86, 359559, 359561, 382 31, G02B 2746, G03H 116, G06K 976
Patent
active
051594749
ABSTRACT:
The Fourier transform optical processing system of the present invention includes generating an electrical signal in response to a first image and modulating a beam of coherent light with means that is responsive to the electrical signal. A Fourier transform image of the modulated coherent light beam is formed, an then detected. The detector provides a second electrical signal representative of the Fourier transformed image. Other aspects of the invention include comparing the second electrical signal to a reference electrical signal for producing an output signal representing any differences; optically preprocessing the image; detecting the Fourier transform image and generating signals representative of its Fourier transform characteristics; and modulating a coherent light beam using a liquid crystal or other spatial light modulating device.
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Casasent David P.
Franke Marc A.
Hekker Roeland M. T.
Livny Izhak M.
Mercurio Gregory S.
Arnold Bruce Y.
E. I. Du Pont de Nemours and Company
Lerner Martin
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