1 May 1989 Comparative Holographic Moire Interferometry: Separation Of Moire Fringes From The Carrier Interference Pattern
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Abstract
Comparative holographic moire interferometry (CHMI) permits defect detection by comparison of the mechanical responses of two macroscopically identical specimens at equal loading. In the present work a technique of moire fringe separation is suggested that is amenable to automatic readout. Two approaches are proposed and experimentally verified: phase shifting of the carrier interference pattern and auxiliary carrier fringe generation with subse-quent optical filtering. The phase shifting method is applicable to an additive moire scheme with two reference beams. Auxiliary carrier fringe generation can be used in both additive and multiplicative CHMI. The frequency constraints of the latter method due to the optical recording arrangement and mechanical responses of the tested specimen are analyzed.
V. Sainov, E. Simova, "Comparative Holographic Moire Interferometry: Separation Of Moire Fringes From The Carrier Interference Pattern," Optical Engineering 28(5), 285550 (1 May 1989). https://doi.org/10.1117/12.7976997
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