Imaging using fourth-order correlations of coherent fields

John D. Gonglewski; David G. Voelz; David Charles Dayton; Timothy J. Schulz

doi:10.1117/12.161997

9 November 1993 Imaging using fourth-order correlations of coherent fields

John D. Gonglewski, David G. Voelz, David Charles Dayton, Timothy J. Schulz

Proceedings Volume 2029, Digital Image Recovery and Synthesis II; (1993) https://doi.org/10.1117/12.161997
Event: SPIE's 1993 International Symposium on Optics, Imaging, and Instrumentation, 1993, San Diego, CA, United States

Abstract

Correlations of coherent backscatter intensities have been used to form Fourier spectra of coherently illuminated objects. Both second and some fourth-order correlations have been studied. We add to this by describing a new method using fourth order field correlations for imaging. If one knows the actual object speckle field, or certain sheared versions of it, then it is possible through fourth-order correlations to obtain the incoherent brightness function of the object. The technique will allow simultaneous averaging-out of both field phase distortions, certain field measurement noises, and laser speckle.

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John D. Gonglewski, David G. Voelz, David Charles Dayton, and Timothy J. Schulz "Imaging using fourth-order correlations of coherent fields", Proc. SPIE 2029, Digital Image Recovery and Synthesis II, (9 November 1993); https://doi.org/10.1117/12.161997

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KEYWORDS

Speckle

Critical dimension metrology

Speckle pattern

Image restoration

Information operations

Signal to noise ratio

Backscatter

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