An automatic positioning method of the starting point of motion applied to the laser Doppler velocimeter

Abstract

The invention relates to a motion starting point automatic positioning method applied to a laser Doppler velocimeter. The motion starting point automatic positioning method solves the two defects of atraditional laser Doppler velocimeter: 1, the speed measurement precision in the initial motion stage is low; 2, and a relationship between an absolute moment and a movement speed of a measured object cannot be obtained. The motion starting point automatic positioning method comprises the following steps of (1) data acquisition and (2) calculation of a moment t1 when a measured object starts to move from a static state. The motion starting point automatic positioning method can automatically position to the absolute moment when the measured object starts to move from the static state, is convenient to obtain the relation between the absolute moment and the object movement speed, and improves the speed measurement precision in the initial movement stage.

Description

technical field [0001] The invention relates to the field of laser Doppler velocity and acceleration measurement, in particular to an automatic positioning method for a motion starting point applied to a laser Doppler velocimeter. Background technique [0002] Laser Doppler velocity measurement technology is a high-precision non-contact velocity measurement technology based on the optical Doppler effect, which is widely used in various fields. The structure of a typical laser Doppler velocimeter is as follows: figure 1 As shown, the laser emitted by the laser passes through the front lens L 1 After that, it is divided into two paths by the beam splitter, one path of reflected light is directed to the object, and the other path of transmitted light is directed to the mirror M 1 surface. Scattered light on the surface of the measured object and the 1 The two paths of light reflected from the surface are determined by M 2 reflected by the collimating mirror L 2 Collimated...

AI Technical Summary

Problems solved by technology

[0011] When a laser Doppler velocimeter is used to measure the speed of a measured object that changes from a static state to a moving state, the traditional laser Doppler velocimeter cannot automatically locate the absolute moment when the motion state of the measured object changes, so there are the following two disadvantages : 1. The speed measurement accuracy in the initial motion stage is low; 2. The relationship between the absolute moment and the moving speed of the measured object cannot be obtained

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