Effects Of The Atmospheric Air In Interferometric Distance Measurement Using A CO2 Laser

1 January 1987

proceedings article
Published by SPIE-Intl Soc Optical Eng

p. 521-522
https://doi.org/10.1117/12.967377

Abstract

At present, the high-accuracy measurements of absolute distances up to several tens of meters are required in the many fields of science and industry. Recently, we have developed a new infrared laser interferometer (SIDM) which uses a 10.6-μm-0O2 laser as a light source [1]. In this wavelength region, the laser light is not very absorbed by the atmospheric air and the CO₂ laser can emit many laser lines which are necessary for multi-wavelength interferometry. However, for determining the distance with an accuracy of better than 1x10^-7, the refractive index of air under length measurement is required with a high accuracy. In this paper, the effects of the atmospheric air is described on the infrared interferometric length-measurement.

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