Sandwich Shearography: A Technique For The Cancellation Of Unknown Rigid Body Displacements In Shearography

H. A. Lamprecht; E. van Rooyen

doi:10.1117/12.962747

25 April 1990 Sandwich Shearography: A Technique For The Cancellation Of Unknown Rigid Body Displacements In Shearography

H. A. Lamprecht, E. van Rooyen

Author Affiliations +

Proceedings Volume 1162, Laser Interferometry: Quantitative Analysis of Interferograms: Third in a Series; (1990) https://doi.org/10.1117/12.962747
Event: 33rd Annual Technical Symposium, 1989, San Diego, United States

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.

Citation Download Citation

H. A. Lamprecht and E. van Rooyen "Sandwich Shearography: A Technique For The Cancellation Of Unknown Rigid Body Displacements In Shearography", Proc. SPIE 1162, Laser Interferometry: Quantitative Analysis of Interferograms: Third in a Series, (25 April 1990); https://doi.org/10.1117/12.962747

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