Coherent moire technique for obtaining slope and curvature of stress patterns

Subrata K. Bhadra; Samir Kumar Sarkar; Rabindra Nath Chakraborty; Amitabha Basuray

doi:10.1117/12.179403

1 October 1994 Coherent moiré technique for obtaining slope and curvature of stress patterns

Subrata K. Bhadra, Samir Kumar Sarkar, Rabindra Nath Chakraborty, Amitabha Basuray

Author Affiliations +

Optical Engineering, Vol. 33, Issue 10, (October 1994). https://doi.org/10.1117/12.179403

Abstract

A method for studying the stress-induced birefringence over the area of a sample by simultaneous application of shearing interferometry and moiré techniques is dealt with. This is a method by which one can have the fringe pattern for the first and second derivative of the birefringence distribution in the form of the slope and curvature of the test wavefront. There is, however, a method of obtaining the second derivative fringe system by using a four-exposure holographic technique in which the pattern is generated by shearing of two holograms of deformed surface. This is related to stress distribution in the structure under test. In the presented method, on the other hand, the test wavefront carries the information of stress distribution in terms of birefringence. The suggested experimental setup can provide the slope and curvature of the test wavefront in a single exposure.

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Subrata K. Bhadra, Samir Kumar Sarkar, Rabindra Nath Chakraborty, and Amitabha Basuray "Coherent moiré technique for obtaining slope and curvature of stress patterns," Optical Engineering 33(10), (1 October 1994). https://doi.org/10.1117/12.179403

Published: 1 October 1994

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