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Proceedings Paper

Discerning holographic and shearographic carrier fringes using the hyperboloids in holodiagrams
Author(s): Huai Min Shang; Chenggen Quan; Cho Jui Tay; Y.Y. Hung
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Paper Abstract

The carrier fringe is frequently used together with conventional double-exposure holography and shearography. The pattern of the carrier fringes to be used is affected by the pattern of the deformation fringes, for instance, parallel fringe-lines will not be useful for beam bending problems and concentric circular carrier fringes will be unsuitable for circular plates under axisymmetrical loading. The formation of holographic fringe patterns has been explained using the moire fringes that are generated by optically differentiating the ellipsoids of holodiagrams. This paper describes a new method based on the hyperboloids instead of ellipsoids. With this method, the hyperboloids directly depict holographic carrier fringe patterns; to understand the formation of shearographic patterns, only one optical differentiation is made on the hyperboloids. This therefore will allow easy understanding of how the light source should be shifted in generating the appropriate carrier fringe patterns.

Paper Details

Date Published: 13 June 2001
PDF: 6 pages
Proc. SPIE 4317, Second International Conference on Experimental Mechanics, (13 June 2001); doi: 10.1117/12.429640
Show Author Affiliations
Huai Min Shang, National Univ. of Singapore (Singapore)
Chenggen Quan, National Univ. of Singapore (Singapore)
Cho Jui Tay, National Univ. of Singapore (Singapore)
Y.Y. Hung, National Univ. of Singapore (United States)

Published in SPIE Proceedings Vol. 4317:
Second International Conference on Experimental Mechanics
Fook Siong Chau; Chenggen Quan, Editor(s)

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