温度对高精度光学玻璃折射率均匀性检测的影响

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。

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

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.