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12 December 1984 Moire Interferometry for Deformation and Strain Studies
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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.
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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);

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