Optical: systems and elements – Optical modulator – Light wave temporal modulation
Patent
1989-11-14
1992-02-18
LaRoche, Eugene R.
Optical: systems and elements
Optical modulator
Light wave temporal modulation
385 16, G02F 103, G02F 113, G02B 610, G02B 530
Patent
active
050888080
ABSTRACT:
A self-referencing target imaging system 10 capable of long range imaging at visible wavelengths is disclosed herein. The imaging system 10 of the present invention includes a transmitter 20 for illuminating a target 30 with a series of electromagnetic pulses P. The present invention further includes an apparatus 35, 40 and 45 for redirecting first R1 and second R2 reflections of each illuminating pulse P from first 32 and second 34 portions of the target 30, respectively. A frequency modulator 50 driven by a generator 55 shifts the frequency of each first reflection R1 to produce a reference reflection R1' corresponding to each illuminating pulse P. The present invention further includes an arrangement of reflective elements 60 and 65 for respectively combining the reference R1' and the second R2 reflections of each illuminating pulse P to generate a series of combined reflections. A detector 70 generates an imaging signal in response to the series of respectively combined reflections.
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J. L. Smith et al., "Real-Time Optical Processing Using the Liquid Crystal Light Valve", Journal of Applied Photographic Engineering, vol. 5, No. 4, (Fall 1979), pp. 236-243.
Amnon Yariv, Introduction to Optical Electronics, Second Edition, pp. 256-257; 261-262; and 350-351.
Denson-Low W. K.
Duraiswamy V. D.
Hughes Aircraft Company
LaRoche Eugene R.
Lester Evelyn A.
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