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A. J. Durelli angle applied axis base length beam birefringent boundary camera Cartesian Chapter circular ring subjected computed coordinate corresponding curve deformed body deformed grating density determined diametral compression direct strain disk displacement component distance between fringes dots elasticity epoxy equations error Eulerian Eulerian strain field Figure film fringe order fringe pattern fringe spacing geometric grating lines grid hologram horizontal interferometer isobathics isochromatics isoclinics isopachics isothetic lines Lagrangian load levels loci of points master grating master-grating lines measured Mech mismatch Mohr's circle moire effect moire fringes moire method moire pattern moire-of-moire obtained optical out-of-plane displacement partial derivatives perpendicular photoelastic photograph pitch Plexiglas points exhibiting Poisson's ratio position principal strains principal stresses produced radial ratio rotation rubber sensitivity shear strain shift shown in Fig specimen grating strain analysis strain tensor subjected to diametral superposed surface techniques thickness u-field undeformed velocity zero