Comparative holographic interferometry-a tool for nondestructive inspection

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Abstract
Comparative holography offers to holographic interferometry the capability to compare interferometrically two physically different but macroscopically identical specimens as to their resistance to strength. One of the first developments has been toward the detection of flaws by generating fringes corresponding to the difference in displacement components of the identically stressed master and test object. The purpose of this brief communication is to outline the basis of comparative holography in application to flaw detection. Experimental results obtained in the case of a practical flaw inspection problem are presented. Apart from its ability to render significant services in nondestructive inspection, comparative holographic interferometry is expected to find applications in other engineering problems having considerable practical interest.

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