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Proceedings Paper

Triple-exposure shearography for the measurement of surface slopes
Author(s): Cho Jui Tay; Huai Min Shang; D. Choong
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Paper Abstract

This paper presents an optical technique for the measurement of surface slope based on laser speckle-shearing interferometry. The technique employs an image shearing camera which records sheared images of an object illuminated by an expanded laser beam. Three exposures on the object are made after the light source is moved in a prescribed manner, resulting in the fringe pattern representing lines of constant surface slopes. In contrast to the previous double exposure method, this method has the advantage of increased sensitivity. The theory of the technique as well as some experimental results are presented.

Paper Details

Date Published: 20 March 1997
PDF: 6 pages
Proc. SPIE 2921, International Conference on Experimental Mechanics: Advances and Applications, (20 March 1997); doi: 10.1117/12.269851
Show Author Affiliations
Cho Jui Tay, National Univ. of Singapore (Singapore)
Huai Min Shang, National Univ. of Singapore (Singapore)
D. Choong, National Univ. of Singapore (Singapore)

Published in SPIE Proceedings Vol. 2921:
International Conference on Experimental Mechanics: Advances and Applications
Fook Siong Chau; C. T. Lim, Editor(s)

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