广角任意反射面速度干涉仪虚像性质

Virtual image properties of wide-angle velocity interferometer system for any reflector

通过分析虚像连续性和位置分辨,指出点集散判据相比相位差判据更适合用于广角任意反射面速度干涉仪(VISAR)靶虚像模型构建。基于点集散判据计算了椭球镜形状参数、像面记录方式、冲击波面倾斜对广角VISAR靶虚像的影响,发现虚像外内径之比总保持在8左右,且10^(-5)(k-400)<m<10^(-5)k(k与m为广角VISAR靶形状参数)时,椭球镜加工误差对像面影响较小;对像面进行平面检测难以得到动态干涉条纹;广角VISAR诊断区域允许波面平均倾斜不超过2°。讨论了广角VISAR靶虚像相干性、异形光纤面板的加工、椭球镜参数的选取、物像重构等问题,对诊断实验提出了参考建议。虚像性质研究为广角VISAR诊断能力提升奠定了基础,对惯性约束聚变内爆对称性诊断具有重要意义。

By comparing the continuity and resolution of virtual image at“point convergence criterion”and“phase difference criterion”,it is proposed that the former is more suitable for virtual image model of wide-angle velocity interferometer system for any reflector(VISAR).Based on“point convergence criterion”,the effects of ellipsoidal mirror parameters,image recording method and shock wave tilt on the virtual image of the wide-angle VISAR target are analyzed.It is discovered that the ratio of outer and inner diameter of the virtual image is about 8 and the ellipsoidal mirror processing error has little influence on image surface when10^(-5)(k-400)<m<10^(-5)k(k and m are the shape parameters of wide-angle VISAR target),it is difficult to obtain dynamic interference fringes in plane detection and wide-angle VISAR diagnosis allows the average inclination angle of shock wave not to exceed 2°.Issues such as virtual image interference of wide-angle VISAR,processing of special-shaped fiber optic panels,selection of ellipsoidal mirror parameters and image reconstruction are discussed,and some suggestions for diagnostic experiments are given.The research on properties of virtual image lays a foundation for the improvement of wideangle VISAR diagnostic capability,and is of great significance for the symmetry diagnosis in inertial confinement fusion.