A least squares procedure to fit irradiance measurements of a digitalized interferogram data to a sinusoidal function has been described in the literature by Greivenkamp. On the other hand, a general theory of phase stepping algorithms based on Fourier theory has been described by Freischlad and Kouliopoulos. In this paper it is shown that Greivenkamp results for a least squares procedure may be easily obtained from this Fourier theory.
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