Observation Of Difference Displacement Fringes Using Comparative Holography And Its Application To The Detection Of Concealed Flaws

Pramod K. Rastogi

doi:10.1117/12.938587

25 November 1986 Observation Of Difference Displacement Fringes Using Comparative Holography And Its Application To The Detection Of Concealed Flaws

Pramod K. Rastogi

Author Affiliations +

Proceedings Volume 0661, Optical Testing and Metrology; (1986) https://doi.org/10.1117/12.938587
Event: 1986 Quebec Symposium, 1986, Quebec City, Canada

Abstract

Comparative holography is an important development in laser based metrology. The technique provides holographic interferometry with the ability to optically subtract the phase terms to obtain a fringe pattern corresponding to the difference in deformations of two nominally identical specimens. After laying a theoretical foundation to the technique, the paper evokes a couple of practical configurations to implement the technique. The method is experimentally demonstrated and results obtained in application to flaw detection are presented. Finally, a few considerations into the formation of the difference displacement fringes are briefly stated.

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Pramod K. Rastogi "Observation Of Difference Displacement Fringes Using Comparative Holography And Its Application To The Detection Of Concealed Flaws", Proc. SPIE 0661, Optical Testing and Metrology, (25 November 1986); https://doi.org/10.1117/12.938587

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