成像型任意反射面速度干涉仪测速精度检测

Accuracy examination of shock speed measurement by imaging velocity interferometer system for any reflector

基于神光Ⅲ原型装置,提出了一种对成像型任意反射面速度干涉仪(VISAR)测量冲击波速度的精度进行实验检验的方法。针对一般双灵敏度VISAR存在的多值问题,该方法利用厚度已知的样品获得了准确的冲击波速度历史曲线图,并给出其测速精度。同时在理论上对这套测速系统进行了不确定度评估,预估结果与实验结果相吻合,验证了这种方法的正确性。此外,该方法还可用于单灵敏度VISAR确定条纹丢失的数目,仅凭一台条纹相机就可确定速度历史曲线。

Based on SG-Ⅲ prototype laser facility, an experimental method to examine the accuracy of shock speed measurement by imaging velocity interferometer system for any reflector（VISAR） was developed. The conventional double-sensitivity method leads to multiple results. Whereas, with samples of known thickness, the accurate curve of shock wave velocity and accuracy of shock speed measurement were achieved by the proposed method. Also a theoretical calculation of this system was carried out. The theoretical and experimental results agree with each other perfectly. This method can also help to acquire the number of lost fringes on single-sensitivity VISAR. With only one streak camera, the accurate curve of shock wave velocity can be achieved.