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TECHNICAL BRIEFS

Separation of Additive and Subtractive Moiré Patterns

[+] Author and Article Information
J. A. Clark, A. J. Durelli

Civil Engineering and Mechanics Department, The Catholic University of America, Washington, D. C.

J. Appl. Mech 38(1), 266-269 (Mar 01, 1971) (4 pages) doi:10.1115/1.3408753 History: Received January 20, 1970; Revised April 29, 1970; Online July 12, 2010

Abstract

Using a spatial filtering technique, moiré patterns can be observed that correspond to different forms of the indicial equation describing the parametric properties of gratings and moiré. In particular both the additive and subtractive moirés are obtained individually over the field. This method, combined with a previously developed method for obtaining spatial partial derivatives from deformed gratings, permits the experimental determination of the whole field of Cartesian shears and rigid rotations.

Copyright © 1971 by ASME
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