横向VISAR及其在爆轰驱动楔形靶自由面横向速度测量中的应用

A Transverse VISAR for Measuring Free Surface Transverse Velocity of Detonation-Driven Wedge Target

利用多点双灵敏度VISAR(任意反射面速度干涉仪)和三探头装置,搭建了横向VISAR测量系统。在三探头装置中,一个探头发射并接收激光,另外两个探头从不同方向接收激光。根据三探头接收激光的多普勒频移,可推出测点的纵向和横向速度。开展了爆轰驱动楔形靶实验,利用平面波透镜和Т/Г炸药在10°钢楔形靶中产生平面冲击波,采用横向VISAR测量系统,观测冲击波斜碰撞楔形靶自由面引起的自由面横向运动。测量得到的最大纵向速度约1 680m/s,最大横向速度约140m/s。对横向速度测量不确定度进行了分析,不确定度约为33m/s。

A transverse velocity interferometer system for any reflector （VISAR） has been developed by com- bination of a multipoint VISAR and a tri-probe device. One probe emits and receives laser, and the other two probes receive laser from different directions. The transverse and longitudinal velocities can be deduced from Doppler shift of laser received by the tri-probe. The transverse VISAR were applied to detonation driving wedge target experiments. Planar shock wave in a 10° wedge steel target was generated by plane-wave lens and T/P explosive. The free surface transverse velocities induced by oblique collision of shock wave were meas- ured. The maximum measured longitudinal velocity is about 1 680 m/s,and the maximum measured transverse velocity is about 140 m/s. The uncertainty of the transverse velocity measurement was analyzed, and the un certainty is estimated to be about 33 m/s in the experiments.