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Proceedings Paper

Sandwich Shearography: A Technique For The Cancellation Of Unknown Rigid Body Displacements In Shearography
Author(s): H. A. Lamprecht; E. van Rooyen
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Paper Abstract

A new speckle-shearing interferometric method that allows the cancellation of unknown rigid body displacements in shearography is presented. The technique, referred to as sandwich shearography, combines the advantages of sandwich holography and conventional shearography, to measure displacement derivatives directly. The method involves the recording of two different speckle patterns on separate photographic plates. The plates are then sandwiched together and placed in a Fourier filtering setup, to obtain fringes depicting contours of constant strain. A method to cancel rigid body translations and rotations is described. Experimental verification of the method is presented and discussed.

Paper Details

Date Published: 25 April 1990
PDF: 12 pages
Proc. SPIE 1162, Laser Interferometry: Quantitative Analysis of Interferograms: Third in a Series, (25 April 1990); doi: 10.1117/12.962747
Show Author Affiliations
H. A. Lamprecht, University of Pretoria (South Africa)
E. van Rooyen, University of Pretoria (South Africa)


Published in SPIE Proceedings Vol. 1162:
Laser Interferometry: Quantitative Analysis of Interferograms: Third in a Series
Ryszard J. Pryputniewicz, Editor(s)

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