A pitch-variation moiré fringes method of temporal phase unwrapping profilometry

Abstract

A method of pitch-variation moiré fringes is proposed to realize the temporal phase unwrapping for three-dimensional profilometry. On the basis of the principle of moiré pattern, we achieve variable spatial frequencies of fringes in a moiré pattern by rotating two gratings. Furthermore a five-point fitting method is used to automatically compute the central position of side-lobe spectrum of the moiré fringes. Finally, a generalized temporal phase unwrapping algorithm is introduced to process the three-dimensional reconstruction. The theoretical analysis and experimental results show the validity of the proposed method.

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