Precise measurement of the difference of the air-refractive indices between visible and near-infrared wavelengths using two-color interferometer

Ichiro Fujima; Shige Iwasaki; Guangping Xie; Katuo Seta

doi:10.1117/12.369380

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11 November 1999 Precise measurement of the difference of the air-refractive indices between visible and near-infrared wavelengths using two-color interferometer

Ichiro Fujima, Shige Iwasaki, Guangping Xie, Katuo Seta

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Proceedings Volume 3897, Advanced Photonic Sensors and Applications; (1999) https://doi.org/10.1117/12.369380
Event: International Symposium on Photonics and Applications, 1999, Singapore, Singapore

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.

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Ichiro Fujima, Shige Iwasaki, Guangping Xie, and Katuo Seta "Precise measurement of the difference of the air-refractive indices between visible and near-infrared wavelengths using two-color interferometer", Proc. SPIE 3897, Advanced Photonic Sensors and Applications, (11 November 1999); https://doi.org/10.1117/12.369380

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