基于精密离心机的线加速度计交叉耦合系数的校准

Calibration for the Cross-coupling Coefficients of Linear Accelerometers Base on Precision Centrifuge

介绍了精密离心机上进行加速度计交叉耦合系数的校准方法。分析了试验半径反算法、回归迭代法的测量步骤及处理方法并根据加速度计的试验半径,对交叉轴、横向轴安装状态下,安装标称位置对准误差产生的原因进行了分析,并研究了对准误差对二次项系数测量的影响。最终确定了建模方法,并对校准结果作了不确定度分析。

A calibration method for the cross-coupling coefficients of linear accelerometers was researched in this paper. The calibration test was conducted on a precision centrifuge. The calculation of radius and the procedure of iterative regression method were analyzed in this paper. According to the principle of measurement,the sources of alignment error were analyzed in the installation condition of both the crossed-axis and the transverse axis. The calibration accuracy was verified by the calculation of radius,the definition of alignment error for nominal installation angle and the research of influence on the second-order coefficients by alignment error. The modeling method was established and the uncertainty of calibration result was analyzed.