Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

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

A Doppler velocimeter and automatic positioning technology, which is applied to devices using optical methods, etc., can solve the problems of low velocity measurement accuracy in the initial movement stage, and the absolute time relationship cannot be obtained, so as to improve the velocity measurement accuracy and improve the accuracy. The effect of improving the recognition accuracy

Active Publication Date: 2020-09-29
XI'AN INST OF OPTICS & FINE MECHANICS - CHINESE ACAD OF SCI
View PDF6 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • An automatic positioning method of the starting point of motion applied to the laser Doppler velocimeter
  • An automatic positioning method of the starting point of motion applied to the laser Doppler velocimeter
  • An automatic positioning method of the starting point of motion applied to the laser Doppler velocimeter

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0050] The content of the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0051] The invention provides a high-precision automatic positioning method for the moment when the moving state changes when using a laser Doppler velocimeter to measure the speed of a measured object changing from a static state to a moving state.

[0052] Such as figure 2As shown, the present invention discloses a method for automatically locating the starting point of motion when a laser Doppler velocimeter is used to measure the object to be measured and starts to move from rest. The specific method includes the following steps:

[0053] 1) Parameter acquisition

[0054] 1.1) Set the sampling frequency f of the laser Doppler velocimeter 0 , The sampling time is T, the laser Doppler velocimeter starts to collect data, and obtains the motion state data of the measured object;

[0055] 1.2) After the data acquisit...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

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...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): G01P3/36
CPCG01P3/36
Inventor 郝歌扬吕沛吴国俊杨钰城吕小鹏
Owner XI'AN INST OF OPTICS & FINE MECHANICS - CHINESE ACAD OF SCI
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com