Method and apparatus for adaptive real-time optical correlation using phase-only spatial light modulators and interferometric detection
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United States of America Patent
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Jan 4, 1994
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N/A
app pub date -
Sep 14, 1992
filing date -
Sep 14, 1992
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Abstract
A video-rate correlator constructed with a phase-only spatial light modulator and video camera. The phases of the Fourier spectra of a test and reference image are measured by real-time fringe scanning interferometry. The two phase images are then electronically subtracted. The optical Fourier transform of this difference produces the phase-only correlation response. This correlator is real-time adaptive, in that it uses live imagery, and neither the test or reference images need any preprocessing off-line. Especially small optical layouts, which also efficiently use light for correlation, can be configured through the use of specific embodiments, which use only a single phase-only spatial light modulator and Fourier transform lens.
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