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Title: Surface profiling of a transparent object by use of phase-shifting Talbot interferometry
Authors: Thakur, M. 
Tay, C.J. 
Quan, C. 
Issue Date: 1-May-2005
Citation: Thakur, M., Tay, C.J., Quan, C. (2005-05-01). Surface profiling of a transparent object by use of phase-shifting Talbot interferometry. Applied Optics 44 (13) : 2541-2545. ScholarBank@NUS Repository.
Abstract: Talbot interferometry is used to study the surface profile of a transparent object. Periodic patterns are produced by illuminating a grating with a collimated laser beam. The object is placed on the self-image plane of the grating. The deformed grating image, which interferes with another grating, results in the Talbot interferometric fringes. The fringe pattern is recorded on a CCD camera for subsequent analysis, and the phase variation is achieved by a linear translation stage. In this application two specimens are tested to demonstrate the validity of the method; one is a transparent object with a spherical shape with a height of less than 350 μm, and the other is a transparent object with an uneven surface of 50 μm average height. The experimental results are compared with the test results obtained with the mechanical stylus method. © 2005 Optical Society of America.
Source Title: Applied Optics
ISSN: 00036935
DOI: 10.1364/AO.44.002541
Appears in Collections:Staff Publications

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