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

Eddy current displacement detection method

A displacement detection, eddy current technology

Inactive Publication Date: 2011-01-19
UNIV OF ELECTRONICS SCI & TECH OF CHINA
View PDF5 Cites 16 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to overcome the shortcomings of the large calibration workload of the existing eddy current displacement detection device, an eddy current displacement detection method is proposed, and the eddy current displacement detection device using this method can match a variety of measured objects with different electromagnetic characteristics

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
  • Eddy current displacement detection method
  • Eddy current displacement detection method
  • Eddy current displacement detection method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0029] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments. like figure 1 and figure 2 As shown, a specific embodiment of an eddy current displacement detection method of the present invention is disclosed, including:

[0030] Step 1. Generate a sinusoidal excitation signal U 0 : The sinusoidal excitation signal U is generated by the signal generation module 0 and input it into the eddy current probe coil module, U 0 Expressed by formula (1),

[0031] u 0 =A 0 cos(ωt+φ 0 ) Formula 1)

[0032] In formula (1), U 0 is the sinusoidal excitation signal, A 0 is the amplitude of the sinusoidal excitation signal, ω is the angular frequency, t is the time variable, φ 0 is the initial phase of the sinusoidal excitation signal, where A 0 and ω are preset known quantities; φ 0 A known quantity obtained by measurement.

[0033] In this embodiment, the signal generation module includes a cont...

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 an eddy current displacement detection method. The method comprises the following steps of: 1, generating a sinusoidal excitation signal, namely generating the sinusoidal excitation signal U0 by a signal generation module and inputting the sinusoidal excitation signal U0 into an eddy current probe coil module; 2, generating a response signal, namely after inputting the sinusoidal excitation signal into the eddy current probe coil module, probing the change of impedance of an eddy current probe module caused by the change of displacement of the eddy current probe coil module and a detected object to acquire the response signal according to the electromagnetic induction principle, and inputting the response signal into a response signal separation module; and 3, separating the response signal, namely dividing the response signal into a first path of response subsignal and a second path of response subsignal by the response signal separation module, and the like. The eddy current displacement detection method has the advantage of capacity of finishing the displacement detection of detected objects made of various materials by using a set of eddy current displacement detection device, so the times of calibration is reduced, the interchangeability of eddy current displacement detection devices is improved, and the cost is reduced.

Description

technical field [0001] The invention belongs to the technical field of non-destructive testing, in particular to the eddy current non-destructive displacement testing technology. Background technique [0002] Eddy current nondestructive testing technology uses the principle of electromagnetic induction to realize detection, measurement and evaluation. When a current that changes harmonically with time is input to the probe coil above a measured object, a magnetic field is first generated around the coil, which is called a primary magnetic field. According to the principle of electromagnetic induction, when the distance between the measured object and the probe coil is small enough, an eddy current is generated in the measured object, and the eddy current also generates a magnetic field (secondary magnetic field), which hinders the change of the primary magnetic field, thereby causing the coil change in impedance. Because the coupling effect of the primary magnetic field an...

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 Applications(China)
IPC IPC(8): G01B7/02G01N27/90
Inventor 杜平安于亚婷杨拓
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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