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Optical Engineering

Coherent moiré technique for obtaining slope and curvature of stress patterns
Author(s): Subrata K. Bhadra; Samir Kumar Sarkar; Rabindra Nath Chakraborty; Amitabha Basuray
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Paper 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.

Paper Details

Date Published: 1 October 1994
PDF: 5 pages
Opt. Eng. 33(10) doi: 10.1117/12.179403
Published in: Optical Engineering Volume 33, Issue 10
Show Author Affiliations
Subrata K. Bhadra, Univ. of Calcutta (India)
Samir Kumar Sarkar, Univ. of Calcutta (India)
Rabindra Nath Chakraborty, Univ. of Calcutta (India)
Amitabha Basuray, Calcutta Univ. (India)

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