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Proceedings Paper

Surface contour measurement by grating projection method based on Talbot effect
Author(s): M. Thakur; Chenggen Quan; Cho Jui Tay
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Paper Abstract

Motivated by the Talbot-effect, a grating projection system was designed. Periodic patterns were produced from the projection of a grating illuminated by collimated laser beam. The self- image of the grating is projected on object surface and the deformed grating image is captured by a CCD Camera for subsequent analysis. The phase variation is achieved by using a linear translation stage incorporated to the grating. In this application, a coin with an uneven surface of less than 0.2 mm is tested to demonstrate the validity of the method. The experimental results are compared with test results using mechanical stylus method.

Paper Details

Date Published: 12 April 2005
PDF: 5 pages
Proc. SPIE 5852, Third International Conference on Experimental Mechanics and Third Conference of the Asian Committee on Experimental Mechanics, (12 April 2005); doi: 10.1117/12.621465
Show Author Affiliations
M. Thakur, National Univ. of Singapore (Singapore)
Chenggen Quan, National Univ. of Singapore (Singapore)
Cho Jui Tay, National Univ. of Singapore (Singapore)


Published in SPIE Proceedings Vol. 5852:
Third International Conference on Experimental Mechanics and Third Conference of the Asian Committee on Experimental Mechanics
Chenggen Quan; Fook Siong Chau; Anand Asundi; Brian Stephen Wong; Chwee Teck Lim, Editor(s)

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