Real-time phase step measurement using the volume enclosed by a surface algorithm in self-calibrating phase-shifting interferometry

Abstract This manuscript presents a simple, and very efficient method capable of measuring in real-time the phase steps from an interferogram varying with the time. Within a range ( 0 , 2 π ) given by the phase steps of two fixed reference interferograms. The phase differences among the dynamic and reference interferograms are computed by an algorithm of type self-calibrating generalized phase-sifting interferometry based on geometric concept of volume enclosed by a surface. This proposal has the property to accept or reject the measured data, and its calibration process is very easy, which are very important advantages, so it is a very practical method. Theoretical model is described, verified with a numerical simulation, and applied to measure experimentally the phase steps in three optical tables with different conditions.

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