Variation in displacement values along projection moire fringes in contour difference and vibration analysis of structures

Philip Hopstone; Avi Katz; Jacob Politch

doi:10.1117/12.55561

1 January 1990 Variation in displacement values along projection moire fringes in contour difference and vibration analysis of structures

Philip Hopstone, Avi Katz, Jacob Politch

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Optical Engineering, Vol. 29, Issue 1, (January 1990). https://doi.org/10.1117/12.55561

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.

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Philip Hopstone, Avi Katz, and Jacob Politch "Variation in displacement values along projection moire fringes in contour difference and vibration analysis of structures," Optical Engineering 29(1), (1 January 1990). https://doi.org/10.1117/12.55561

Published: 1 January 1990

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