Multiplication and Interpolation of Moiré Fringe Orders by Purely Optical Techniques

[+] Author and Article Information
C. A. Sciammarella, N. Lurowist

Department of Engineering Science and Mechanics, University of Florida, Gainesville, Fla.

J. Appl. Mech 34(2), 425-430 (Jun 01, 1967) (6 pages) doi:10.1115/1.3607700 History: Received June 10, 1966; Revised October 16, 1966; Online September 14, 2011


Two new, purely optical techniques are introduced to increase the sensitivity of the moiré method. One of the techniques makes it possible to observe moiré fringes of fractional orders. Observation of moiré fringes of the p/5-order are reported, which means that, with the 300-lines-per-in. grid utilized in the examples presented in the paper, it is possible to observe the same pattern that could be observed with a 1500-lines-per-in. grid. The other technique makes it possible to read fractional orders by a compensation technique similar to Tardy’s compensation process utilized in photoelasticity.

Copyright © 1967 by ASME
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