自校准靶型在冲击波实验中的应用

在使用任意反射面速度干涉仪(VISAR)测量运动表面速度的过程中,利用双灵敏度方法可以获得唯一的速度。由于双灵敏度方法对速度的判断需要人为干预,所以就会出现速度的非唯一性问题。在成像型VISAR中,由于散斑和条纹质量下降等问题,该现象更加严重。提出了一种可进行自校准判断的靶型,可以在获得冲击波速度的同时获得唯一冲击波速度,从而改进了双灵敏度方法。通过积分速度曲线的面积,获得运动表面所经历的距离。比较几组相近速度曲线的积分值与已知样品的厚度,可以获得准确的冲击波速度历史曲线图。同时该方法也是一种从实验上验证VISAR系统不确定度的方法,与理论上的评估结果相互吻合,证明了该方法的正确性。这种改进的双灵敏度测速方法和不确定度评估方法,可为未来的VISAR诊断精密化发展提供技术思路。

Self-Check Target for Shock-Wave Experiment with Radiation Drive Source

The shock-wave velocity can be obtained with two-sensitivity method on the measurement of shock-wave velocity with imaging velocity interferometric system for any reflector (VISAR) . Since the decision difference for shock-wave velocity, the velocity curve may be not unique. This problem will be serious due to the effect of speckle and decrease of fringe pattern. The new method for target design is provided. After comparing the area of shock-wave velocity and the thickness of transparent window, the shock-wave velocity can be confirmed. And the uncertainty of VISAR system can be achieved which is agreement with the theoretical prediction. This method, which presents the shock wave velocity and uncertainty of VISAR, provides the new way for accurate diagnosis by VISAR system.