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Comparison of the fringe visibility created by zero and first order diffracted beams in a dispersive interferometer

Hassan, Mothana A., Jiang, Xiang and Martin, Haydn (2012) Comparison of the fringe visibility created by zero and first order diffracted beams in a dispersive interferometer. In: Proceedings of The Queen’s Diamond Jubilee Computing and Engineering Annual Researchers’ Conference 2012: CEARC’12. University of Huddersfield, Huddersfield, pp. 110-115. ISBN 978-1-86218-106-9

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Abstract

Interferometery is an important technique which can provide high resolution measurement of surface
topography. In this paper an interferometer with a dispersive probe, sourced by a super-luminescent diode is considered. One important parameter for the effective operation of such an interferometer is the fringe visibility. In this paper the fringe visibility of the first order diffracted light is compared with the reflected (zero order) light from the grating. This is done by modulating the reference beam of the interferometer and recording the fringe modulation on a CCD array. The fringe visibility formed from the first order beam was found to be lower than the zero order, resulting from the efficiency of the diffraction grating.

Item Type: Book Chapter
Uncontrolled Keywords: Surface metrology, interferometer, phase shifting, dispersive probing
Subjects: T Technology > TA Engineering (General). Civil engineering (General)
Schools: School of Computing and Engineering
School of Computing and Engineering > Computing and Engineering Annual Researchers' Conference (CEARC)
School of Computing and Engineering > Centre for Precision Technologies
School of Computing and Engineering > Centre for Precision Technologies > Surface Metrology Group
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Depositing User: Sharon Beastall
Date Deposited: 02 May 2012 12:21
Last Modified: 02 May 2012 12:21
URI: http://eprints.hud.ac.uk/id/eprint/13460

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