基于外差激光干涉法的三轴向振动绝对校准方法研究

与单轴向振动激励相比,三轴向标准振动台能够模拟被校三轴向加速度计的实际应用环境。利用三轴向标准振动台获取被校加速度计真实的空间响应特性,以实现被校加速度计的精确校准。立足于加速度矢量理论与三轴向加速度计的灵敏度矩阵模型,提出基于带通采样的外差激光干涉法的三轴向振动绝对校准方法,通过计算被校加速度计的灵敏度矩阵实现其校准。实验结果表明,该方法能够同时实现高精度的三轴向加速度计主轴与横向灵敏度的校准,有效地降低了校准时间与重复安装误差。

Research on the Method of the Triaxial Primary Vibration Calibration Using the Heterodyne Interferometry

Compared with the one-axial vibration excitation in the traditional calibration method, the triaxial standard vibration exciter can simulate the actual application environment of the calibrated accelerometer. The spatial response characteristic of the accelerometer can be obtained by using the triaxial standard vibration exciter to realize the accurate calibration of the accelerometer. The sensitivity matrix model of the triaxial accelerometer was proposed which used the bandpass based on heterodyne interferometry triaxial primary vibration calibration method and the theory of the acceleration vector. This method realizes the calibration of the accelerometer by calculating its sensitivity matrix. The experimental results show that this method can simultaneously realize the high precise calibration of the principal and the transverse sensitivities of the triaxial accelerometer, and this method can effectively reduce the calibration time and the error caused by the repetitive installations.