测量爆炸冲击过程多普勒信号拾取技术

Doppler Signal Picking Technology in Measurement of Blast Shock

采用优化后的外差式纵向激光多普勒进行了光路测量,利用短时傅里叶变换最大主值频率法和小波变换模极大值法分析处理多普勒信号,有效地抑制了爆炸信号的噪声.系统测量距离4.5 m,测量速度范围-10 m/s^20 m/s,相对误差小于100/.试验证明,该方法能有效地拾取反映爆炸过程动态特性的多普勒信号,实现对爆炸容器高速动态形变参数的精确测量.

An optimized heterodyne longitudinal laser Doppler optical structure is adopted to improve the intensity of Doppler signal. Both the most principle frequency method based on short time Fourier transform and the modulus maximum method based on wavelet transform are employed to deal with explosion Doppler signal, which can restrain noise effectively. The measurement distance reaches 4.5 m, the measurement range of deformation speed is from - 10 m/s to 20 m/s, and the relative error of measurement is less than 1%. The experiments indicate that the method can pick up Doppler signal associated with dynamic characteristics of blast shock effectively, and realize accurate measurement of high velocity deformation parameters of explosion container.