Abstract

A computer-based method is developed to measure the out-of-plane motion of a surface which might arise, for example, from the deflection of a structural component or as a result of contouring a 3-D surface with respect to a reference plane. Artificial speckles are projected onto the test surface using an ordinary 35-mm projector equipped with a clear glass slide sprayed with black paint. Speckle patterns are digitally recorded as the surface changes its shape, and the apparent in-plane movements of the projected speckle are computed over the full field by numerically correlating small subsets extracted from each pattern. These shifts are related to the deflection of the surface with respect to its initial location.

© 1986 Optical Society of America

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