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The determination of the zero-order interferometric region and its central fringe in white-light interferometry

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Abstract:

In a white-light interferometer the ambiguities of the determination of the zero-order interferometric region and its central fringe decrease the resolution of the system. In this paper, we report an efficient method to make the amplitude difference between the zero- and first-order interferometric regions, and that between the central fringe and its side fringes dominant. By the use of our signal-processing scheme, it is found theoretically and experimentally that the minimum signal-to-noise ratio required for the determination of the zero-order interferometric region and its central fringe is greatly reduced.

Keywords: White-light interferometry; fringe identification; signal processing

Document Type: Original Article

DOI: http://dx.doi.org/10.1078/0030-4026-00005

Affiliations: Information Optics Laboratory, Shanghai Institute of Optics and Fine Mechanics, Academia Sinica, P.O. Box 800-211, Shanghai 201800, China

Publication date: January 1, 2001

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