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Proceedings Paper

Observation Of Difference Displacement Fringes Using Comparative Holography And Its Application To The Detection Of Concealed Flaws
Author(s): Pramod K. Rastogi
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Paper 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.

Paper Details

Date Published: 25 November 1986
PDF: 10 pages
Proc. SPIE 0661, Optical Testing and Metrology, (25 November 1986); doi: 10.1117/12.938587
Show Author Affiliations
Pramod K. Rastogi, Swiss Federal Institute of Technology (Switzerland)


Published in SPIE Proceedings Vol. 0661:
Optical Testing and Metrology
Chander Prakash Grover, Editor(s)

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