计量学报2012，Vol.33Issue(1)：1-4,4.DOI:10.3969/j.issn.1000-1158.2012.01.01
光干涉法高精度材料线膨胀系数测量
Thermal Expansion Coefficient Measurements with Precision Interferometer
摘要
Abstract
The thermal expansion measurements with NIM' s precision interferometer are described. The measurements are based on the observation of the length change of the material samples as a function of a temperature using laser interferometry. The interferometer and the material sample up to 1m are situated in a tight enclosure which temperature is controlled by a water circulation within a temperature range from 5 ℃ to 40 ℃. A heat-balanced interference mirror was designed. A high precision temperature measuring system is used for measuring the temperature of the material sample and the air. The accurate determination of the refractive index of air and the real-time compensation of zero error are accomplished. Using an 500 mm gauge block, thermal expansion coefficient is measured with a relative deviation of less than 0. 2% , and it was compared with those of Physikalisch-Technische Bundesanstalt (PTB) of Germany. The coefficient of thermal expansion can be obtained with a uncertainty less than 3 × 10-8K-1.关键词
计量学/线膨胀系数/激光干涉测量/空气折射率/不确定度Key words
Metrology/ Thermal expansion coefficient/ Laser interferometry/ Air refractive index/ Uncertainty分类
通用工业技术引用本文复制引用
张旭东,苏永昌,叶孝佑..光干涉法高精度材料线膨胀系数测量[J].计量学报,2012,33(1):1-4,4.基金项目
科技部基础条件平台项目(PT0709-3) （PT0709-3）
