爆炸冲击的激光多普勒远距离测量技术的研究

Technique of Remote Measurement of Blast Shock Based on Laser Doppler Effect

利用激光多普勒效应和数字信号处理方法,获取爆炸冲击过程中的高速变形参数,以此作为对爆炸强度分析的依据。根据爆炸变形的特点,设计了外差式纵向激光多普勒测量系统,提出了相应的数字滤波和频谱分析的信号处理方法,实现了爆炸变形的动态测量。系统测量的位移量程为±30mm,速度量程为-10^+20m/s,测量距离为4.5m。与振动台的试验对比,位移测量相对误差小于1%。给出了圆筒钢制爆炸容器在300gTNT当量炸药爆炸过程中弹性变形的测量结果。

The paameters of high velocity deformation of blast shock to analyze explosive power are obtained with laser Doppler effect and digital signal processing. According to te characteristic of explosive deformation,a heterodyne longitudinal laser Doppler system has been designed. In addition, corresponding ways of digital filtering and spectrum analysis have been put forward to realize dynamic measurement of explosive deformation. The deformation measurement range is ±30 mm,and the deformation speed is from -10 m/s to ＋20 m/s,and the measuring distance reaches 4. 5 m. The relative error of displacement measurement is less than 1% in comparison with that measured by a reference vibration platform. Finally,the experimental results of deformation of columned steel explosive container are given under the condition of 300 g TNT explosion.