Measurement of Surface-Displacements Normal to Line of Sight by Holo-Moiré Interferometry

[+] Author and Article Information
Y. Y. Hung, C. E. Taylor

Department of Theoretical and Applied Mechanics, University of Illinois, Urbana, Ill.

J. Appl. Mech 42(1), 1-4 (Mar 01, 1975) (4 pages) doi:10.1115/1.3423518 History: Received January 01, 1974; Revised August 01, 1974; Online July 12, 2010


This paper describes a new technique called “Holo-moiré interferometry” which combines the moiré and holographic techniques so that full-field measurement of the displacements normal to the line of sight is achieved. The method is particularly useful in measuring in-plane displacements; a type of measurement for which the conventional moiré technique is too insensitive, and for which holographic interferometry requires pointwise separation of displacement components from a multiple-hologram scheme. Holo-moiré interferometry overcomes the major limitations of both. An example which compares experimental with analytical predictions is presented. The limitations of the scheme are discussed.

Copyright © 1975 by ASME
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