高g值加速度传感器激光绝对法冲击校准技术研究

Shock calibration for a high-g accelerometer using a laser interferometer

在详细分析反射式激光多普勒原理的基础上,研究了高g值加速度传感器的冲击校准方法。该方法利用Hopkinson杆作为加载手段,利用差动式激光多普勒干涉仪来绝对复现冲击加速度的量值。针对高g值压阻加速度传感器SIMIT-AYZ-60k进行了一系列的校准试验,利用积分运算法和最小二乘法的组合从准动态条件下的校准数据得到了准静态条件下的传感器冲击灵敏度。试验表明,这种方法实现了利用脉宽有限的激励脉冲对固有频率在20 kHz以上的高g值加速度传感器的校准,校准的不确定度可以满足冲击测试的工程需求。

Based on analysis of the reflecting type laser Doppler principle, a method for shock calibration of a high- g piezoresistive accelerometer was studied here. A Hopkinson bar was used to generate an excited acceleration pulse absolutely measured using a differential laser interferometer. A set of calibration tests was conducted for a high-g accelerometer SIMIT-AYZ-60k. The shock sensitivity of the accelerometer was calculated with the quasi-dynamic calibration data using the least square method. It was demonstrated that this method is effective for shock calibration of high-g accelerometers whose natural frequencies are above 20kHz using the excited pulse with a definite duration; the calibration accuracy is adequate to meet the requirements of engineering measurement.