基于小尺寸Hopkinson杆的动态校准系统

The Dynamic Calibration System Based on Micro-Hopkinson Bar

针对高g值高安装谐振频率加速度计动态校准过程中高g值窄脉冲加速度激励信号难以产生的难题,提出了基于小尺寸Hopkinson杆的动态校准系统。该系统采用压缩空气作为激励源,小尺寸精密校准杆作为加载装置来产生窄脉冲加速度激励信号,并通过轴向激光干涉仪进行激励信号的测量。且校准实验结果表明,该系统可以充分激起安装谐振频率为180kHz的高g值加速度计B&K 8309的高阶谐振频率,校准结果较为理想。

In order to generate narrow shock pulse excited a high-g accelerometer with high resonance frequency, a dynamic calibration system based on the micro-Hopkinson bar was put forward. Compressed air was used for excitation source in this calibration system, micro alignment bar was used as a loading device, and axial laser inter- ferometer was used for measuring the excitation signal. It was demonstrated that this system is effective for amplitude-frequency response characteristic calibration of a high-g aceelerometer such as B＆K 8309 whose resonance frequency is 180 kHz, and various resonance frequencies of 8309 were excited using the narrow shock pulse which was generated by the above system.