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Optical Engineering

Variation in displacement values along projection moire fringes in contour difference and vibration analysis of structures
Author(s): Philip Hopstone; Avi Katz; Jacob Politch
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Paper Abstract

This paper presents a qualitative and quantitative analysis of timeaveraged projection moire vibration measurements for a plate and a cylindrical shell. It is pointed out that although moire fringes are generally considered to represent a constant contour difference or constant vibration level, in practice, variations in local grid pitch values on the test-item surface result in wide variations in measured displacement levels for given fringe numbers, which must be taken into consideration for quantitative evaluation.

Paper Details

Date Published: 1 January 1990
PDF: 3 pages
Opt. Eng. 29(1) doi: 10.1117/12.55561
Published in: Optical Engineering Volume 29, Issue 1
Show Author Affiliations
Philip Hopstone, Rafael (Israel)
Avi Katz, Rafael (Israel)
Jacob Politch, Technion--Israel Institute of Technology (Israel)

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