Real-Time Phase Detection For Fringe-Pattern Analysis Using Digital Signal Processing

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A real-time phase detection method is proposed for restoring three-dimensional profile from fringe patterns generated by deformed grating method or interferometry. The method uses the digital signal processing technique, DPLL(digital phase-locked loop), for extracting the phase distribution directly from the video signal of fringe image. This method is easy to apply to practical measurements and vision systems which need a fast information processing capability, because the phase distribution can be extracted in video-rate with high accuracy and it is suited to a computer base system. The principles and the experimental results are presented in this paper.

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