Abstract
When a laser beam illuminates an optically rough surface, the reflected wavelets mutually interfere to form a pattern of random dots called speckles which carry the surface roughness information. And when a specimen is strained plastically, its surface roughness changes as a result. Thus, by illuminating a deformed specimen with a smoothly polished surface and monitoring the reflected speckle pattern via a pattern recognition technique, the state of plastic deformation can be accertained. An example of this technique's application to detecting the initiation and propagation of a fatigue crack is presented.
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