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12 December 1984 Moire Interferometry for Deformation and Strain Studies
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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 ℓ/in.) were used, providing a sensitivity of 0.417 μm/fringe order (16.4 μin./fringe order). Excellent fringe contrast was obtained in all cases, even for gradients of 64 fringes/mm (1600 fringes/in.). A 4-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.
© (1984) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Daniel Post "Moire Interferometry for Deformation and Strain Studies", Proc. SPIE 0503, Application, Theory, and Fabrication of Periodic Structures, DiffractionGratings, and Moire Phenomena II, (12 December 1984); https://doi.org/10.1117/12.944825
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