Comparison of carrier removal methods in Fourier transform fringe analysis

摘要

A key step in the Fourier transform method (FTM) of fringe pattern analysis is carrier removal. In this paper, the existing methods of fringe carrier removal in FTM are reviewed and a comparison of three different methods, translation of the sidelobe to the frequency origin, least-squares fit and subtraction of the phase of the undeformed carrier fringes, is also presented. Computer-generated fringe patterns were used in order to determine the differences between the original and the retrieved phase distributions. Several figures of merit are proposed to assess the performance of the mentioned methods.