高冲击加速度传感器频响窄脉冲标定测试技术

High-g Accelerometer Frequency Response Calibration Test Technology Based on Narrow Pulse Principle

摘要:

针对高冲击加速度传感器的频响计量测试问题，设计了一种可实现冲击加速度传感器频响窄脉宽标定系统。该系统采用Hopkinson杆为试验装置，以激光多普勒测速仪作为基准信号测量装置，基于窄脉冲频响计量测试原理，采用汉宁窗和三次插值方法对信号进行处理，基于LabVIEW和MATLAB开发环境编写数据处理程序，实现对被校MEMS冲击传感器频响的快速解算。试验结果表明，该系统能够快速解算出高冲击加速度传感器的幅频特性函数，对传感器工作频带的估计误差低于10%。该系统避免了不同窄脉冲激励条件下，对基准信号和加速度传感器输出信号进行处理的复杂流程，采用适于常规输入信号的信号处理方法，提升了约20%频响测试效率，实现了对加速度传感器频响的快速标定测试。

Abstract:

In order to calibrate the frequency response of high-g accelerometer, a system for calibrating the frequency response of high-g accelerometer with narrow pulse width is designed in this paper. The system uses the Hopkinson bar as the test device, the laser Doppler velocimeter as the reference signal measuring device, based on the measurement principle of narrow pulse frequency response. The Hanning window and cubic interpolation method with higher accuracy are selected to process the signal, and the program is written on the LabVIEW and MATLAB development environment to realize the calculation of the frequency response of the calibrated MEMS high g accelerometer. The test results show that the system can calculate the amplitude-frequency characteristics of high-g accelerometers, the estimated error of the working frequency band of the sensor is less than 10%, and the obtained sensor frequency response characteristics are consistent. So as to improve the efficiency of frequency response calculation, the system abandons the previous specialized signal processing method, adopts a signal processing method that is generally applicable to input signals, improved the frequency response test efficiency by about 20%, and this system is practical in the fast calibration test of accelerometer frequency response.