温度条件对大尺寸测量装置精度影响的研究

大尺寸测量装置由于测量范围大,其测量精度受诸多因素影响,其中大尺寸测量装置所处环境条件变化会影响其测量精度。基于中国计量科学研究院地下一层实验室80m长度标准装置,在空调控温状态和自然温度状态(不控温)下,进行了长度测量范围为10,30,70m的测量精度实验研究,得到空调控温状态下折射率补偿误差分别为7.0,10.5,21.0μm;自然温度状态下折射率补偿误差分别为2.5,2.9,3.9μm。实验结果表明:大尺寸测量装置在自然温度状态下能得到更高的测量精度,当测量范围大于30m时,测量精度可优于10^-7量级。

Study of Temperature States Influence on the Accuracy of Large Size Measuring Devices

Large-scale measuring device has a wide measuring range, the measurement accuracy of the device is affected by many factors, among them, the change of the environmental conditions of the large size measuring device will affect its measurement accuracy. Based on the indoor 80m length standard device of National Institute of Metrology, China, the measurement accuracy experiment of 10m, 30m, 70m in the air conditioning temperature control state and natural temperature state (not controlled temperature) were designed to study, the refractive index compensation errors in the air-conditioning temperature control state were 7.0μm, 10.5μm, and 21.0μm, and the refractive index compensation errors in the natural temperature state were 2.5μm, 2.9μm, and 3.9μm respectively. The experimental results show that the large-scale measuring device can obtain higher measurement accuracy under natural conditions, and when the measuring range is greater than 30m, the measurement accuracy can be better than 10^-7 magnitude.