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Frequency-multiplex Fourier-transform profilometry: a single-shot three-dimensional shape measurement of objects with large height discontinuities and/or surface isolations

1997; Optica Publishing Group; Volume: 36; Issue: 22 Linguagem: Inglês

10.1364/ao.36.005347

0003-6935

Mitsuo Takeda, Quan Gu, Masaya Kinoshita, Hideaki Takai, Yosuke Takahashi,

Thermography and Photoacoustic Techniques

The performance of Fourier-transform profilometry is enhanced by a new technique that is based on spatial frequency multiplexing combined with the Gushov-Solodkin phase unwrapping algorithm. The technique permits the three-dimensional shape measurement of objects that have discontinuous height steps and/or spatially isolated surfaces, which has not been possible by conventional Fourier-transform profilometry. An important feature of the technique is that it requires only a single fringe pattern; the single-shot recording makes possible the instantaneous three-dimensional shape measurement of discontinuous objects in fast motion. Experimental results are presented that demonstrate the validity of the principle.