Computer-assisted techniques to evaluate fringe patterns

Cesar A. Sciammarella; Gopalakrishna K. Bhat

doi:10.1117/12.135311

1 January 1992 Computer-assisted techniques to evaluate fringe patterns

Cesar A. Sciammarella, Gopalakrishna K. Bhat

Proceedings Volume 1553, Laser Interferometry IV: Computer-Aided Interferometry; (1992) https://doi.org/10.1117/12.135311
Event: San Diego, '91, 1991, San Diego, CA, United States

Abstract

Strain measurement using interferometry requires an efficient way to extract the desired information from interferometric fringes. Availability of digital image processing systems makes it possible to use digital techniques for the analysis of fringes. In the past, there have been several developments in the area of one dimensional and two dimensional fringe analysis techniques, including the carrier fringe method (spatial heterodyning) and the phase stepping (quasi-heterodyning) technique. This paper presents some new developments in the area of two dimensional fringe analysis, including a phase stepping technique supplemented by the carrier fringe method and a two dimensional Fourier transform method to obtain the strain directly from the discontinuous phase contour map.

Citation Download Citation

Cesar A. Sciammarella and Gopalakrishna K. Bhat "Computer-assisted techniques to evaluate fringe patterns", Proc. SPIE 1553, Laser Interferometry IV: Computer-Aided Interferometry, (1 January 1992); https://doi.org/10.1117/12.135311

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