Differentiation of Moiré Patterns by Optical Spatial Filtering

[+] Author and Article Information
F. P. Chiang, R. P. Khetan

Department of Mechanics, College of Engineering, State University of New York, Stony Brook, N. Y.

J. Appl. Mech 42(1), 25-28 (Mar 01, 1975) (4 pages) doi:10.1115/1.3423547 History: Received October 01, 1973; Online July 12, 2010


By placing a moiré pattern behind the first field lens of an optical spatial processor its diffraction spectrum will be formed at the first image plane of the system. This diffraction spectrum is filtered to give two images only along a selected direction. The third field lens collects the selected orders to form the Moiré pattern at the second image plane. However, if a recording photographic plate is placed at a certain distance away from the second image plane, a double image occurs which is shifted along the selected direction. The resulting moiré-of-moiré pattern depicts the partial derivative contours of the model.

Copyright © 1975 by ASME
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