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Proceedings Paper

Interferometry with referencing of wavelength
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Paper Abstract

In this contribution we present an approach to incremental interferometric measurements of displacements over a limited range where the atmospheric wavelength of the coherent laser source is either directly stabilized to a mechanical reference or is corrected to fit to the reference. The idea comes from the possibility to use a highly stable material for a reference frame, material which can perform thermal expansion coefficients on the level 10-8/K within a large temperature range up to 50K. Over a range of several K which may be the practical range for displacement measurements the coefficient is even smaller. This may outperform the best techniques of correction for the variations of the refractive index of air. The mechanics is always a part of the measurement setup and represents one of the sources of uncertainty. A link of the refractive to the mechanical reference can practically eliminate another source of uncertainty.

Paper Details

Date Published: 26 July 2011
PDF: 6 pages
Proc. SPIE 8001, International Conference on Applications of Optics and Photonics, 80010X (26 July 2011); doi: 10.1117/12.892700
Show Author Affiliations
Josef Lazar, Institute of Scientific Instruments (Czech Republic)
Ondrej Cip, Institute of Scientific Instruments (Czech Republic)
Martin Cizek, Institute of Scientific Instruments (Czech Republic)
Jan Hrabina, Institute of Scientific Instruments (Czech Republic)
Zdenek Buchta, Institute of Scientific Instruments (Czech Republic)


Published in SPIE Proceedings Vol. 8001:
International Conference on Applications of Optics and Photonics
Manuel Filipe Costa, Editor(s)

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