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Proceedings Paper

A hybrid technique for ultra-high dynamic range interferometry
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Paper Abstract

In this paper, we explore the optimization and implementation of multi-wavelength interferometers such that measurements beyond the largest beat wavelength can be achieved reliably. A hybrid beat wavelength approach is presented that also exploits wavelength coincidence between two beat wavelengths in order to measure unambiguously over an extended range. The performance of the approach has been explored both through simulations and experimental validation has been obtained using a fiber interferometer with 4 measurement wavelengths. The initial results have demonstrated 1/200th of a fringe phase resolution giving absolute metrology over 18.16 mm, or a dynamic range of 1 part in 2.4×106.

Paper Details

Date Published: 11 August 2008
PDF: 8 pages
Proc. SPIE 7063, Interferometry XIV: Techniques and Analysis, 70630X (11 August 2008); doi: 10.1117/12.795293
Show Author Affiliations
Konstantinos Falaggis, Univ. of Leeds (United Kingdom)
David P. Towers, Univ. of Leeds (United Kingdom)
Catherine E. Towers, Univ. of Leeds (United Kingdom)

Published in SPIE Proceedings Vol. 7063:
Interferometry XIV: Techniques and Analysis
Joanna Schmit; Katherine Creath; Catherine E. Towers, Editor(s)

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