Brown Nathan P, Jennings Christopher A, De La Cruz Christopher, Dolan Daniel H
Sandia National Laboratories, P.O. Box 5800, Albuquerque, New Mexico 87185-1189, USA.
Rev Sci Instrum. 2024 Jun 1;95(6). doi: 10.1063/5.0215360.
The apparent velocity measured by an interferometric surface velocimeter is a function of both the surface velocity and the time derivative of the refractive index along the measurement path. We employed this dual sensitivity to simultaneously measure km/s surface velocities and 1018 cm-3 average plasma densities with combined VISAR (velocity interferometer system for any reflector) and PDV (photonic Doppler velocimetry) measurements in experiments performed on the Z Pulsed Power Facility. We detail the governing equations, associated assumptions, and analysis specifics and show that the surface velocity can be extracted without knowledge of the specific plasma density profile.
干涉式表面速度计测量的视在速度是表面速度和沿测量路径的折射率时间导数的函数。在Z脉冲功率设施上进行的实验中，我们利用这种双重灵敏度，通过结合VISAR（任意反射器速度干涉仪系统）和PDV（光子多普勒测速法）测量，同时测量了千米/秒的表面速度和10的18次方立方厘米的平均等离子体密度。我们详细介绍了控制方程、相关假设和分析细节，并表明无需了解特定的等离子体密度分布即可提取表面速度。
