加速度传感器动态校准系统不确定度评估方法的研究

Research on uncertainty evaluation method of dynamic calibration system for acceleration sensor

摘要:

针对加速度传感器动态校准获取其工作频带的过程中,因校准系统存在测试不确定度导致传感器校准不准确的问题,设计了某型号加速度传感器的动态校准试验,以试验数据为依据提出了系统不确定度评估方法。通过对冲击试验台为冲击激励源构成的动态校准系统测试过程中几个主要误差源的分析,结合文中提出的系统不确定度评估方法计算出校准系统的测试标准不确定为1.77%,扩展不确定度为3.54%。对比测量仪器特性评定相关指标可知该校准系统符合工程校准需要,而该评估方法的提出对校准系统的不确定度评估有一定的现实指导意义。

Abstract:

for acceleration sensor dynamic calibration to obtain the operating frequency band, for the above process, due to the calibration of the system existence test uncertainty leads to the problem of inaccurate sensor calibration design dynamic calibration test of a certain type of acceleration sensor, using experimental data as the basis the system uncertainty evaluation method. Through the analysis of several major error sources of shock testing machine for impact excitation source dynamic calibration system of testing process, combined with the system proposed in this paper, uncertainty degree evaluation method of calculated system calibration test standard uncertainty is 1.77%, and the expanded uncertainty of 3.54%. It is known that the calibration system can meet the requirements of Engineering calibration, and the evaluation method is of practical significance to the evaluation of the uncertainty of the calibration system.