A Wide Velocity Domain Imaging Doppler Velocimeter

Abstract

The invention discloses a wide speed range imaging Doppler velocimeter, which comprises a probe optical module, a light collection imaging module, a front interference module, a rear low speed interference module, a rear high speed interference module and a recording module. A wide-velocity domain imaging Doppler velocimeter adopting the above technical scheme, through the design of the front interference module with unequal arms, the rear low-speed interference module and the rear high-speed interference module, combined with the polarization probe light and the polarization selection function , can realize high-precision diagnosis from low-speed to high-speed process in a single shot, filling the gap in the field of speed measurement for simultaneous measurement of low-speed and high-speed processes, in the fields of high energy density physics, astrophysics, and laser inertial confinement fusion It has important scientific research and economic value.

Description

technical field [0001] The invention relates to the technical field of laser interference velocimetry, in particular to a wide velocity domain imaging Doppler velocimeter. Background technique [0002] In the research of high energy density physics, based on laboratory conditions, the equation of state of materials under extreme pressure conditions is studied, whether it is for exploring astrophysical processes such as the formation of the universe and the state of the earth's crust, or for laser inertial confinement fusion such as loading efficiency and material opacity Research is an important research tool. Under laboratory conditions, loading samples indirectly driven by laser is one of the important ways to generate ultra-high pressure state. According to the thermodynamic path of loading, it can be mainly divided into impact loading and quasi-isentropic loading. Under the condition of impact loading, the pressure state of the material is obtained by measuring the velo...

AI Technical Summary

Problems solved by technology

Among them, VISAR is a velocity interferometric velocimeter. It adopts high-resolution optical imaging and can perform high-precision diagnosis of the velocity history of the shock wave inside a tiny sample. It is mainly used in the study of material characteristics in a laser-driven high-voltage state, but is limited by its velocity measurement principle. , cannot perform high-precision diagnosis on low-speed processes; AFDISAR is a displacement interference single-point velocimeter with high sensitivity and is suitable for low-speed diagnosis. The velocity surface uniformity of the sample to be tested can be obtained through multiple sets of configurations

Because it obtains the velocity information of the sample to be tested through an optical fiber array, the spatial resolution is poor, and it is usually suitable for velocity diagnosis of large-sized samples such as flyers

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