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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。
In the measurement of the speed of the moving surface using an arbitrary reflection surface velocity interferometer (VISAR), a unique speed can be obtained with the double sensitivity method. Due to the double sensitivity method to judge the speed of human intervention, so there will be non-unique speed issues. In the imaging VISAR, the phenomenon is exacerbated by problems such as reduced speckle and streaks. A target model that can be used for self-calibration is proposed. The single shock wave velocity can be obtained simultaneously with the shock wave velocity, which improves the dual-sensitivity method. The distance traveled by the moving surface is obtained by integrating the area of the velocity curve. Comparing the integral values of several similar velocity curves with the known thickness of the sample, an accurate history graph of the shock wave velocity can be obtained. At the same time, this method is also a method of verifying the uncertainty of VISAR system experimentally, which is consistent with the theoretical evaluation results, which proves the correctness of this method. This improved dual-sensitivity tachymetry method and uncertainty assessment method can provide technical ideas for the future development of VISAR diagnosis precision.