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Optical Engineering

Moire Interferometry For Deformation And Strain Studies
Author(s): Daniel Post
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Paper Abstract

Recent advances in high sensitivity moire interferometry are described. In-plane displacement fields are shown for very challenging problem areas: adhesive joints in tension and in bending, flexure of quasi-isotropic composite laminates, and fatigue cracks in aluminum. Reference gratings with 2400 lines/mm (60,960 //in.) were used, providing a sensitivity of 0.417 Am/fringe order (16.4 Ain./fringe order). Excellent fringe contrast was obtained in all cases, even for gradients of 64 fringes/mm (1600 fringes/in.). A four-beam optical system to produce two orthogonal virtual reference gratings was employed. The question of unknown relative displacements in two-body problems was answered by use of a soft bridge between the bodies to provide a continuous path for the fringe count.

Paper Details

Date Published: 1 August 1985
PDF: 5 pages
Opt. Eng. 24(4) doi: 10.1117/12.7973547
Published in: Optical Engineering Volume 24, Issue 4
Show Author Affiliations
Daniel Post, Virginia Polytechnic Institute and State University (United States)

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