An Imaging Doppler Velocimeter

Abstract

The invention discloses an imaging type Doppler velocimeter, which at least includes a probe light module, a light-receiving imaging module, a front interference module, a rear interference module and a recording module, wherein the light-receiving imaging module includes a first imaging mirror , a second imaging mirror and a third imaging mirror, the first imaging mirror is arranged between the probe light module and the front interference module, and the second imaging mirror is arranged between the front interference module, the rear interference module and the sample In between, the third imaging mirror is arranged between the rear interference module and the recording module. An imaging-type Doppler velocimeter using the above technical solutions, using a newly designed Doppler interference structure, based on the principle of Doppler frequency shift combined with interference diagnosis, realizes high precision for the low-speed motion process of a hundred-micrometer-scale sample Diagnosis, that is: high-precision diagnosis of the velocity evolution history of low-velocity samples in one-dimensional space, fills the gap of high-precision diagnosis of low-velocity processes in fields such as laser inertial confinement fusion.

Description

technical field [0001] The invention relates to the technical field of laser interference velocimetry, in particular to an imaging Doppler velocimeter. Background technique [0002] With the development of science and technology, traditional coal, petroleum and other fossil energy sources are ultimately limited and cannot meet the growing energy needs of mankind for a long time. Energy gain through inertial confinement fusion is one of the effective ways for laboratories to realize controlled energy, and it has important research value both in the civilian economy and in the military field. With the improvement of the development capability of high-energy laser devices, it is one of the important ways of inertial confinement fusion to rely on super-power-density laser pulses to compress the target pellet to a high-temperature and high-density state, and then achieve fusion ignition. At the same time, the extreme states such as high pressure and high density formed in the pr...

AI Technical Summary

Problems solved by technology

[0004] The area-array optical fiber displacement interferometer developed on the basis of AFDISAR can measure the velocity evolution process at multiple positions on the surface of a large sample, but it is only suitable for the velocity measurement of samples with millimeter or even centimeter size such as air cannon-driven flyers

In the research of laser inertial confinement fusion, the sample size is usually only on the order of hundreds of microns, so it is impossible to use the area array fiber displacement interferometer for space-resolved velocity measurement

Therefore, in experimental platforms such as laser inertial confinement fusion research, there is still a lack of a diagnostic device that can measure the low-speed motion process (speed <10km / s) of a sample on the order of hundreds of microns with high precision.

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