温度对高精度光学玻璃折射率均匀性检测的影响

Temperature Effect on High Precision Measurement of Refractive Index Homogeneity of Optical Glass

为了实现光学玻璃折射率均匀性的高精度(0.2×10-6)检测,测量环境温度引入的测量不确定度应小于0.05×10-6。对测量过程中温度引入的不确定度进行了详细分析,总结了温度引起的5种误差源,对各种误差源进行了不确定度分析。结果表明,当测量腔中空气、贴置板、折射率液及被测件的径向温差不超过±0.01℃时,温度引起的测量不确定度为0.031×10-6,满足精度要求。为实验室环境的改造提出了建议,并为高精度玻璃折射率均匀性测量提供了分析数据。

To meet the requirement of high precision measurement （0.2 × 10-6 ） of refractive index homogeneity of optical glass, the uncertainty caused by temperature of measurement environment should be less than 0.05 × 10.6. Uncertainty analysis caused by temperature is taken for five error sources. The result shows that when the radial temperature difference of air, flats, oil, and component in the measurement cavity is --± 0.01 ℃, the uncertainty caused by temperature is 0. 031 × 10-6 , which can satisfy the precision. Important data are offered for high precision measurement of refractive index homogeneity of optical glass, and useful advices are given for the improvement of laboratory enviroment.