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Proceedings Paper

Precise measurement of the difference of the air-refractive indices between visible and near-infrared wavelengths using two-color interferometer
Author(s): Ichiro Fujima; Shige Iwasaki; Guangping Xie; Katuo Seta
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Paper Abstract

Optical measurement technique is widely used in length measurement, such as laser interferometers and electronic distance meters. The correction of air refractive index is necessary because the optical path length should be converted to the geometrical length in most vases. In order to obtain an average refractive index through the optical path, Edlen's formulae have been widely used with environmental measurements of air temperature, pressure, humidity and carbon dioxide concentration. In recent days, more precise formulae for calculating a refractive index of air have been desired in IR region. However, the measurement accuracy for near IR region is not sufficient.

Paper Details

Date Published: 11 November 1999
PDF: 6 pages
Proc. SPIE 3897, Advanced Photonic Sensors and Applications, (11 November 1999); doi: 10.1117/12.369380
Show Author Affiliations
Ichiro Fujima, National Research Lab. of Metrology (Japan)
Shige Iwasaki, National Research Lab. of Metrology (Japan)
Guangping Xie, Nanyang Technological Univ. (Singapore)
Katuo Seta, National Research Lab. of Metrology (Japan)

Published in SPIE Proceedings Vol. 3897:
Advanced Photonic Sensors and Applications
Robert A. Lieberman; Anand Krishna Asundi; Hiroshi Asanuma, Editor(s)

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