Share Email Print
cover

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
Format Member Price Non-Member Price
PDF $14.40 $18.00
cover GOOD NEWS! Your organization subscribes to the SPIE Digital Library. You may be able to download this paper for free. Check Access

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)

© SPIE. Terms of Use
Back to Top