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https://doi.org/10.1364/AO.44.002541
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. https://doi.org/10.1364/AO.44.002541 | 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 | URI: | http://scholarbank.nus.edu.sg/handle/10635/61438 | ISSN: | 00036935 | DOI: | 10.1364/AO.44.002541 |
Appears in Collections: | Staff Publications |
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