Calibration on Measurement System for the Refractive Index of Air Based on Edlén Formula
CUI Jian-jun1,2, LIU Xiang-bin2, KANG Yan-hui2, ZHANG Heng2, LI Jian-shuang1,2
1.State Key Laboratory of Precision Measuring Technology & Instruments,Tianjin University,Tianjin 300072, China;
2.National Institute of Metrology, Beijing 100013, China
Abstract：To verify the performance of refractive index of air measurement system, which has a great influence for accuracy of laser interferometer, one kind of calibration approach is presented for the refractive index of air measurement system of laser interferometer. One special calibration setup is designed which consists of temperature, air pressure and humidity sensors and it is based on Edlén formula to measure the refractive index of air indirectly.Experiment shows that the temperature uncertainty is less than 0.02 ℃ in (5~40)℃, uncertainty of air pressure is 18 Pa in (60~110) kPa and uncertainty of air humidity is 2.0% RH in (10~90) %RH. The relative expend uncertainty of whole system for refractive index of air is 1×10-7, where cover factor k=2.
崔建军, 刘香斌, 康岩辉, 张 恒,李建双. 基于Edlén公式空气折射率测量系统的校准研究[J]. 计量学报, 2014, 35(3): 210-215.
CUI Jian-jun, LIU Xiang-bin, KANG Yan-hui, ZHANG Heng, LI Jian-shuang. Calibration on Measurement System for the Refractive Index of Air Based on Edlén Formula. Acta Metrologica Sinica, 2014, 35(3): 210-215.
2014, Vol. 35 
