Abstract
The VanderLugt spatial frequency correlation technique for detecting changes in the grating period is analyzed numerically. A proposal for real-time quantitative measurement of the surface effects caused by events, such as diffusion or magnetostriction, is also discussed. Normalized correlation intensity peak values, presented as sensitivity curves, were computed for various grating parameters and several types of grating profile. Results indicated that a number of sensitivity curves describe the same change in the grating period, and the technique was found to be essentially profile independent.
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