Mutiple-clock controlled spatial light modulator

Details Mutiple-clock controlled spatial light modulator Mutiple-clock controlled spatial light modulator

1995-12-11

1996-10-15

Hellner, Mark

Optical: systems and elements

Optical modulator

359259, 342 25, 342 54, G02B 2600, G01S 1300

Patent

active

055663826

ABSTRACT:
A SAR radar has an optical processor which uses an electrical-signal-to-light modulator. The modulator includes a tapped delay line which may be either analog or digital, and the signals tapped from the delay line are applied to an array of temporary storage elements, which in the case of analog signals may be a capacitive sample-and-hold, or for digital signals may include storage registers. In order to improve the signal-to-noise ratio (SNR) by comparison with a processor using an acoustic modulator, the signals tapped from the delay line are sampled at a display sampling rate, which is very low by comparison with the signal sampling rate or the highest frequency of interest, and the sampled signals are held until the next following display rate pulse. The signals held in the temporary storage elements are applied to the modulator elements, so that the optical pattern remains fixed for relatively long periods of time during which the optical processing can integrate photons for improved SNR.

REFERENCES:
patent: 4514059 (1985-04-01), McDonnell
patent: 4962382 (1990-10-01), Lee
patent: 5187487 (1993-02-01), Riza
patent: 5307073 (1994-04-01), Riza
patent: 5327274 (1994-07-01), Yamaguchi
patent: 5365237 (1994-11-01), Johnson et al.
patent: 5488504 (1996-01-01), Worchesky et al.

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