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Optics Letters

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  • Editor: Anthony J. Campillo
  • Vol. 31, Iss. 13 — Jul. 1, 2006
  • pp: 1979–1981

High-accuracy determination of water vapor refractivity by length interferometry

René Schödel, Alexander Walkov, and Ahmed Abou-Zeid  »View Author Affiliations


Optics Letters, Vol. 31, Issue 13, pp. 1979-1981 (2006)
http://dx.doi.org/10.1364/OL.31.001979


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Abstract

Humidity is the most problematic parameter for the accurate determination of the refractive index of air. Besides the fact that the humidity measurement can be limiting, the existing empirical equations for the refractive index of moist air are either restricted to 20 ° C or are based on insufficient knowledge of the refractivity of water vapor. To overcome this problem, a new kind of measurement method for the refractivity of water vapor is suggested that is based on the accurate measurement of the absolute length of a step length by interferometry under vacuum conditions and subsequent measurements at different well-defined absolute water vapor pressures.

© 2006 Optical Society of America

OCIS Codes
(120.0120) Instrumentation, measurement, and metrology : Instrumentation, measurement, and metrology
(120.3180) Instrumentation, measurement, and metrology : Interferometry
(120.5710) Instrumentation, measurement, and metrology : Refraction

ToC Category:
Instrumentation, Measurement, and Metrology

History
Original Manuscript: February 27, 2006
Revised Manuscript: April 20, 2006
Manuscript Accepted: April 20, 2006

Citation
René Schödel, Alexander Walkov, and Ahmed Abou-Zeid, "High-accuracy determination of water vapor refractivity by length interferometry," Opt. Lett. 31, 1979-1981 (2006)
http://www.opticsinfobase.org/ol/abstract.cfm?URI=ol-31-13-1979


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