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研究了一种压阻式三轴高g加速度计的霍普金森杆法测试实验及其数据处理方法。被测加速度计安装于标定杆的端部,从高压气舱中射出的子弹高速撞击标定杆,所产生的冲击以应力波的形式在标定杆中传播,并可以通过安装在杆中部的应变计记录。通过比较应变计的输出和加速度计输出的积分,可以计算得出被测加速度计的灵敏度。利用这种标定方法,测试了一种压阻式单片集成三轴高g加速度计的Z轴单元和X轴单元的灵敏度,测试结果分别为(2.18μV/g)/5V和(2.15μV/g)/5V。这一测试结果与利用自由落杆测试系统得出的测试结果基本吻合,表明本文所采用的测试系统及实验数据处理方法是可信的。
A Hopkinson bar test and its data processing method for a piezoresistive three-axis high-g accelerometer are studied. The accelerometer under test is mounted on the end of the calibration rod. The bullet fired from the high-pressure air tank strikes the calibration rod at high speed. The impact generated in the calibration rod propagates in the form of stress wave and can be transmitted through the strain gauge recording. By comparing the output of the strain gage with the output of the accelerometer, the sensitivity of the accelerometer under test can be calculated. Using this calibration method, the sensitivity of a piezoresistive monolithic integrated three-axis high-g accelerometer with Z-axis and X-axis was tested and the results were 2.18μV / g and 2.15μV / g) / 5V. The test results are basically consistent with the test results using the free-fall test system, indicating that the test system and experimental data processing methods used in this paper are credible.