SPECIAL SECTION ON OPTICAL METROLOGY DEVELOPMENTS AND APPLICATIONS IN THE TRANSPORTATION INDUSTRY

Absolute phase analysis method for three-dimensional surface profilometry using frequency-modulated grating

[+] Author Affiliations
Yasuyuki Ikeda, Satoru Yoneyama, Motoharu Fujigaki, Yoshiharu Morimoto

Wakayama University, Department of Opto-Mechatronics, 930 Sakaedani, Wakayama?640?8510, Japan E-mail: yoneyama@sys.wakayama-u.ac.jp

Opt. Eng. 42(5), 1249-1256 (May 01, 2003). doi:10.1117/1.1566780
History: Received Aug. 30, 2002; Revised Oct. 7, 2002; Accepted Oct. 7, 2002; Online May 05, 2003
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The authors propose a new high-speed and accurate phase analysis and subsequent phase unwrapping method for grating projection surface profilometry. In the proposed method, a special grating pattern is used for the projection. The light intensity distribution of this grating pattern has a form of a frequency modulated sinusoidal wave. In this grating pattern, two different phase distributions are included. The frequency modulated grating, which can be generated with an LCD projector or a film projector easily, is projected onto an object. Then, nine frames with phase stepping at a regular interval for a cycle are taken by a CCD camera. From these nine pictures, the two wrapped phase distributions are analyzed simultaneously. Then, using these phase distributions, phase unwrapping is carried out at each pixel independently. The 3-D profile of the object can be reconstructed using the absolute phase distribution. Since this method is suitable for high-speed shape measurement, applications to various inspections and 3-D surface digitizing are expected. © 2003 Society of Photo-Optical Instrumentation Engineers.

© 2003 Society of Photo-Optical Instrumentation Engineers

Citation

Yasuyuki Ikeda ; Satoru Yoneyama ; Motoharu Fujigaki and Yoshiharu Morimoto
"Absolute phase analysis method for three-dimensional surface profilometry using frequency-modulated grating", Opt. Eng. 42(5), 1249-1256 (May 01, 2003). ; http://dx.doi.org/10.1117/1.1566780


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