Surface contour measurement by grating projection method based on Talbot effect

M. Thakur; Chenggen Quan; Cho Jui Tay

doi:10.1117/12.621465

12 April 2005 Surface contour measurement by grating projection method based on Talbot effect

M. Thakur, Chenggen Quan, Cho Jui Tay

Proceedings Volume 5852, Third International Conference on Experimental Mechanics and Third Conference of the Asian Committee on Experimental Mechanics; (2005) https://doi.org/10.1117/12.621465
Event: Third International Conference on Experimental Mechanics and Third Conference of the Asian Committee on Experimental Mechanics, 2004, -, Singapore

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.

Citation Download Citation

M. Thakur, Chenggen Quan, and Cho Jui Tay "Surface contour measurement by grating projection method based on Talbot effect", Proc. SPIE 5852, Third International Conference on Experimental Mechanics and Third Conference of the Asian Committee on Experimental Mechanics, (12 April 2005); https://doi.org/10.1117/12.621465

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