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To analyze phase distributions of grating and fringe patterns in real-time, several methods were proposed by many researchers. In this paper, four methods to measure shapes of three-dimensional objects developed by the authors are shown. The first is a phase-shifting scanning moire method. The second is a phase-difference scanning moire method. The third is a phase-shifting method using the correlation of the rectangular brightness of a projected grating and two rectangular functions. The last is an integrated phase-shifting method. These methods can provide accurate phase distributions of grating lines and fringe lines in real-time.
The principles of these methods and applications to measure shape, strain and stress analysis are shown.
moire, fringe pattern, grating projection, phase, shape measurement, real-time
Professor, Faculty of Systems Engineering, Wakayama University, Wakayama,
Research Associate, Faculty of Systems Engineering, Wakayama University, Wakayama,