Phase-step calibration for phase-stepped interferometry.
A novel method to set the proper phase steps, as used in phase-stepped interferometry, is presented. It is indicated how and when this method can be used. With only two images one can deduce the relative phase step between them by calculating the correlation between the two images. The error of the proposed method is shown to be smaller than 0.1%.
van Brug
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Optics Research Group, Laboratory of Applied Physics, Delft University of Technology, Lorentzweg 1, 2628 CJ Delft, the Netherlands. brug@optica.tn.tudelft.nl