Effects of the environment on refractive index of air in long gauge block interferometer
Journal article
Authors/Editors
Strategic Research Themes
No matching items found.
Publication Details
Author list: Ranusawud M., Limsuwan P., Somthong T., Vacharanukul K.
Publication year: 2013
Volume number: 37
Issue number: 3
Start page: 782
End page: 786
Number of pages: 5
ISSN: 0141-6359
eISSN: 0141-6359
Languages: English-Great Britain (EN-GB)
View in Web of Science | View on publisher site | View citing articles in Web of Science
Abstract
The environment parameters, i.e. temperature, pressure, humidity and CO2 concentration affecting the refractive index of air play an important role on the long gauge block measurement using interferometer. In this paper, the environment parameters in a measurement chamber had been continuously investigated more than 24 h. The refractive index was then calculated by using an updated Edl้n equation. The stability of the refractive index of air in the experiment is 0.1 ื 10-6 with the measurement uncertainty of 4.32 ื 10-8 at the confidential level k = 2. While the sensitivity of the pressure of air was small, it was an evidence that the pressure of air mainly contributed to the stability of the refractive index of air due to its large variation. Furthermore, the calculated refractive index of air was employed to correct the length of long gauge blocks. The correction for 1 m long gauge block in interferometer system is 0.270 mm, 0.269 mm and 0.267 mm which are respectively based on the three laser wavelengths at 532 nm, 633 nm and 780 nm. ฉ 2013 Elsevier Inc.
Keywords
Gauge block, Interferometer, Sensitivity coefficient
Contact Information