激光多普勒效应在爆炸冲击测量中的应用研究  

STUDY ON LASER DOPPLER TECHNOLOGY IN MEASUREMENT OF BLAST SHOCK

作　　者：刘宏利[1] 邵磊[1] 贾明雁[2] 胡永乐[2] 王宝光[1] 黄福祥[1] 蒋诚志[1] 

机构地区：[1]天津大学精密测试技术与仪器国家重点实验室,天津300072 [2]西北核技术研究所,西安710024

出　　处：《振动与冲击》2008年第1期97-99,114,共4页Journal of Vibration and Shock

摘　　要：将激光多普勒效应应用于爆炸圆筒实验中,实现了圆筒表面形变过程的动态测量。系统采用了外差式纵向激光多普勒测量结构,利用1/2波片、1/4波片与偏振分光棱镜相结合及外差式参考光结构,有效地提高了多普勒信号的强度与信噪比。在信号处理方面,采用了短时傅里叶的频谱分析方法,提高了系统噪声适应能力和信号处理速度;另外采用了相位差频谱校正技术,实现了频率细化和精度提高。最后给出了在不同爆炸载荷条件下的圆筒实验测量结果。Laser Doppler effect is applied in metal cylindrical tube blast tests to obtain the parameters of high velocity deformation of blast shock.The system is based on optical heterodyne structure,and use half wave plate(HWP),quarter wave plate(QWP) and polarization beam splitter(PBS) to improve the intensity of Doppler signal and signal-noise-ratio.In digital signal processing technology,The short time Fourier transformation(STFT) is employed to analyze the frequency of Doppler signal in order to improve the signal processing speed and the phase difference correction method is employed to improve the frequency identification precision.Finally,the experimental results of metal cylindrical tubes are presented under different blast loading.

关 键 词：爆炸载荷 激光多普勒 频率校正 短时傅里叶变换(STFT) 

分 类 号：O384[理学—流体力学] TN247[理学—力学]