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Optical Engineering

Digital processing of Young's fringes in speckle photography
Author(s): Duan-Jun Chen; Fu-Pen Chiang
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Paper Abstract

A new technique for fully automatic diffraction fringe measurement in pointwise analysis of speckle photographs is presented. The fringe orientation and spacing are initially estimated with the help of a 1-D fast Fourier transform (FFT). A 2-D convolution filter is then applied to enhance the estimated image. A fringe pattern with high signal-to-noise ratio is achieved, which makes feasible precise determination of the displacement components. The halo effect is also optimally eliminated in a new way by a halo-division technique. High reliability and accurate determination of displacement components are achieved over a wide range of fringe densities, with the computation time comparing favorably with those for the 2-D autocorrelation method and the iterative 2-D FFT method.

Paper Details

Date Published: 1 November 1990
PDF: 8 pages
Opt. Eng. 29(11) doi: 10.1117/12.55730
Published in: Optical Engineering Volume 29, Issue 11
Show Author Affiliations
Duan-Jun Chen, State Univ. of New York/Stony Brook (United States)
Fu-Pen Chiang, SUNY/Stony Brook (United States)

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