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Proceedings Paper

Spatially frequency-multiplexed number-theoretic phase unwrapping technique for the Fourier-transform profilometry of objects with height discontinuities and/or spatial isolations
Author(s): Mitsuo Takeda; Quan Gu; Masaya Kinoshita; Hideaki Takai; Yousuke Takahashi
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Paper Abstract

To enhance the performance of the Fourier-transform profilometry, a phase unwrapping technique is proposed which is based on the number theory combined with spatial frequency multiplexing. The technique enables the automatic three-dimensional shape measurement of the objects that have discontinuous height steps and/or spatially isolated surfaces, which has not been possible by conventional fringe projection techniques. Another feature of the technique is that it requires only a single fringe pattern, which makes possible the measurement of objects in very fast motion. Experimental results are presented that demonstrate the validity of the principle. Keywords: phase unwrapping, profilometry, fringe analysis, optical metrology, heterodyne interferometry, Fourier transform

Paper Details

Date Published: 17 July 1996
PDF: 8 pages
Proc. SPIE 2860, Laser Interferometry VIII: Techniques and Analysis, (17 July 1996); doi: 10.1117/12.276333
Show Author Affiliations
Mitsuo Takeda, Univ. of Electro-Communications (Japan)
Quan Gu, Univ. of Electro-Communications (Japan)
Masaya Kinoshita, Univ. of Electro-Communications (Japan)
Hideaki Takai, Univ. of Electro-Communications (Japan)
Yousuke Takahashi, Univ. of Electro-Communications (Japan)


Published in SPIE Proceedings Vol. 2860:
Laser Interferometry VIII: Techniques and Analysis
Malgorzata Kujawinska; Ryszard J. Pryputniewicz; Mitsuo Takeda, Editor(s)

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