精密离心机静态半径测量不确定度的温度特性分析

Temperature Characteristics of Uncertainty of Static Radius Measurement of Precision Centrifuge

目的研究温度对精密离心机静态半径测量不确定度的影响。方法以静态半径测量反算法为基础,推导静态半径测量不确定度的温度特性模型,设计精密恒温装置,并进行试验,获取加速度计在1 g离心机场下不同温度时的输出数据,并进行分析。结果基于温度特性模型,确定了影响静态半径测量不确定度的主要因素。试验数据结果表明,在加速度计工作范围内(50~60℃),静态半径测量不确定度随温度递增呈现“先增后减”的分布规律,且在50℃时进入到了10‒7量级。结论加速度计的温度敏感性是影响静态半径测量不确定度的最主要因素,精密控温能显著提高静态半径测量精度。

This paper is intended to research the influence of temperature on the uncertainty of static radius measurement of precision centrifuge.Based on back calculation methods of static radius measurement,a mathematical model was deduced,a precision constant temperature device was designed,to obtain the output data of the accelerometer at different temperatures in a 1g centrifugal field.Based on the temperature characteristic model,the key factors affecting the uncertainty of static radius measurement were determined.The test data analysis results showed that,within the recommended operating range of the accelerometer(50~60℃),the uncertainty of static radius measurement showed a distribution law of“increasing first and then decreasing”with increasing temperature,and entered the order of 10‒7 magnitude at 50℃.The temperature sensitivity of the accelerometer is the most important factor affecting the uncertainty of static radius measurement.Precision temperature control is an important means to improve the static radius measurement accuracy.