Experimental Study on Edlén's Equation in the Temperature Range from 20°C to 60°C

Yoshihiko SHIMIZU; Yoshiaki AKIMOTO; Yoshihisa TANIMURA; Hirokazu MATSUMOTO; Akito OKAMOTO

doi:10.2184/lsj.20.3_146

Yoshihiko SHIMIZU, Yoshiaki AKIMOTO, Yoshihisa TANIMURA, Hirokazu MATSUMOTO, Akito OKAMOTO

Author information

Keywords: Edlén's equation, Refractive index of air, Interferometric length measurement

JOURNAL FREE ACCESS

1992 Volume 20 Issue 3 Pages 146-151

DOI https://doi.org/10.2184/lsj.20.3_146

Details

Abstract

Edlén's equation which is available for determining the refractive index of air around 20°C in lengtn measurement, was experimentally studied in the temperature range from 20°C to 60°C. The experiment were made by using a fringe-counting He-Ne laser interferometer and meteorolo-gical sensors. The difference between the air refractive indices derived from the interferometer and Edlen's equation was estimated to be about 2×10^-⁶ at an air temperature of 60°C.

Corresponding author

Register with J-STAGE for free!