Method and device for measuring particle velocity with low velocity and high acceleration characteristics

A particle velocity and high acceleration technology, which is applied in the direction of devices using optical methods, can solve problems such as the inability to accurately measure particle velocity, and achieve the effects of high test efficiency, easy implementation, and low cost

Active Publication Date: 2012-10-10
INST OF MECHANICS - CHINESE ACAD OF SCI
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Problems solved by technology

[0005] Aiming at the problem that the particle velocity with low speed and high acceleration characteristics cannot be accurately measured in the prior art, the present invention proposes a method and device for measuring particle velocity with low speed a

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  • Method and device for measuring particle velocity with low velocity and high acceleration characteristics
  • Method and device for measuring particle velocity with low velocity and high acceleration characteristics
  • Method and device for measuring particle velocity with low velocity and high acceleration characteristics

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Embodiment Construction

[0060] Embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings. It should be noted that, in the case of no conflict, the embodiments in the present application and the features in the embodiments can be combined arbitrarily with each other.

[0061] For a speed of 10 0 ~10 1 m / s magnitude, and the acceleration is 10 9 m / s 2 For the particle surface velocity of the above order of magnitude, the present invention adopts the method of combining the fiber laser Doppler interferometric velocity measurement hardware system with time-frequency transformation data processing software such as short-time Fourier transform or continuous wavelet transform, to realize the moving target surface with the above-mentioned characteristics High time resolution and velocity resolution test of particle velocity, where the time resolution is 0.2ns, and the velocity accuracy is no more than 0.1% error.

[0062] Such as figure 1 As sho...

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Abstract

The invention discloses a method and a device for measuring particle velocity with low velocity and high acceleration characteristics. An optical fiber laser Doppler interference velocity measuring hardware system and a specific-flow short-time Fourier transform or continuous wavelet transform and time frequency transform data processing combined method are used for measuring particle surface velocity at a speed of 100-101m/s order and an acceleration speed higher than 10<9>m/s<2> order. A high time resolution and velocity resolution test for particle velocity of a mobile target surface with the characteristics is realized, wherein the time resolution is 0.2ns; and the error of velocity does not exceed 0.1%. Besides, the method and the device can be used for simultaneously testing the velocities of multiple channels of particles, testing efficiency is high, cost is low, and the method is easy to implement.

Description

technical field [0001] The invention relates to the field of mass point velocity measurement, in particular to a mass point velocity measurement method with low speed and high acceleration characteristics. Background technique [0002] The strong dynamic loads generated by explosions and impacts have the characteristics of high strength, short duration and small scale, which put forward higher requirements for measurement technology and test equipment. Recently, high-speed photography technology, X flash photography technology, high-speed digital oscilloscope and related sensors, light sources and fast electronic equipment have begun to be applied to explosion and impact experiments. The mainstream of the development of diagnostic technology is fast-response, high-resolution, high-sensitivity non-contact measurement technology based on laser and optoelectronic technology, such as various laser interferometry and spectroscopy techniques (velocity and displacement interferomet...

Claims

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Application Information

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IPC IPC(8): G01P3/36
Inventor 宋宏伟黄晨光王健魏延鹏吴先前
Owner INST OF MECHANICS - CHINESE ACAD OF SCI
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