Digital processing of Young's fringes in speckle photography

Duan-Jun Chen; Fu-Pen Chiang

doi:10.1117/12.55730

1 November 1990 Digital processing of Young's fringes in speckle photography

Duan-Jun Chen, Fu-Pen Chiang

Author Affiliations +

Optical Engineering, Vol. 29, Issue 11, (November 1990). https://doi.org/10.1117/12.55730

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.

Citation Download Citation

Duan-Jun Chen and Fu-Pen Chiang "Digital processing of Young's fringes in speckle photography," Optical Engineering 29(11), (1 November 1990). https://doi.org/10.1117/12.55730

Published: 1 November 1990

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