Sinusoidal fringe projection system based on compact and non-mechanical scanning low-coherence Michelson interferometer for three-dimensional shape measurement

Anna, Tulsi and Dubey, S.K. and Shakher , Chandra and Roy, Amitava and Mehta, D.S. (2009) Sinusoidal fringe projection system based on compact and non-mechanical scanning low-coherence Michelson interferometer for three-dimensional shape measurement. Optics Communications, 282 (7). pp. 1237-1242. ISSN 0030-4018

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Official URL: http://www.sciencedirect.com/science/article/pii/S...

Abstract

We report a sinusoidal fringe projection system based on superluminiscent diode (SLD) as a broad-band light source in conjunction with an acousto-optic tunable filter (AOTF) as frequency tuning device for three-dimensional shape measurement. The present system is based on a compact low-coherence Michelson interferometer system. The conventional interferometric system was modified in which one side of the beam splitter was coated with aluminum oxide which is used as reference mirror. With this modified version, interference fringes can easily be obtained by simply placing the external mirror in contact on the other side of beam splitter. Sinusoidal fringes with multiple spatial-carrier frequency can be generated in real-time using the present system by means of changing the radio-frequency signal to AOTF electronically without mechanically moving any component in the system. The present system was tested by projecting the sinusoidal fringes on a step-like object and 3D shape of the object was reconstructed using Fourier transform fringe analysis technique. The main advantages of the proposed system are completely non-mechanical scanning, easy to align, high stability because of its nearly common-path geometry and compactness.

Item Type: Article
Uncontrolled Keywords: Fourier-transform profilometry;Phase-measuring profilometry;Liquid-crystal display; Grating projection; high -speed; Automatic-measurement; Profile measurement; object shapes; moire; multifrequency
Subjects: CSIO > Optics
Depositing User: Ms. Narinder Kaur
Date Deposited: 24 Feb 2012 17:01
Last Modified: 11 Apr 2012 11:31
URI: http://csioir.csio.res.in/id/eprint/225

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