基于Hopkinson杆的窄脉冲校准系统∗

摘要

针对目前动态校准装置难以安全产生窄脉冲激励信号的问题，基于Hopkinson压杆技术，以压缩空气作为激励源，采用子弹撞击杆的方式，提出了一种可以产生6~10μs窄脉冲校准系统。该系统选用600 mm ×10 mm的钛合金Hopkinson杆，使用应变片和轴向激光干涉仪同时测量获取窄脉冲信号。利用该系统进行了动态校准实验，实验结果表明，该系统产生的窄脉冲可充分激励起8309的谐振频率，通过幅频特性曲线得其工作频带。%present dynamic calibration deviceproduce narrow pulse excitation signal, based on Hopkinson pressure bar technique, com-pressed air as a source of motivationthe way of bullet, a kind of calibration system that can produce 6~10 μs narrow pulse. The system 600 mm × 10 mm titanium alloy Hopkinson bar, strain gauge and axial laser interferometer measurement for narrow pulse signal at the same time. his system dynamic calibration experiment, the experimental results show that the system can fully motivate resonance frequency of the acceleration sensor 8309, its working frequency band obtained through the amplitude-frequency characteristic curve.