Since its introduction by Brunning et al. in 1974, the phase-stepping interferometry has become considered one of the best, quickest and most elegant interferometric techniques. It has found applications in great number of wavefront measuring devices for optical elements control, surface profiling, recognition of shape and deformation, as well as measurement of vibration amplitudes and phases . In this paper some applications of the phase stepping technique in the refractometry of inhomogeneous objects are reported
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