A Magnetic Concentration Pulse Eddy Current Coil Detection Sensor

A technology for detecting sensors and pulsed eddy currents, which is applied in the direction of instruments, measuring devices, scientific instruments, etc., can solve the problems of wide magnetic field distribution area, weak signal, and large noise, so as to improve detection ability, heat generation problem, and detection signal signal. The effect of the noise ratio

Active Publication Date: 2020-03-24
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The problem existing in the existing coil structure is that the generated magnetic field is widely distributed in space and scattered, the signal detected by the detection sensor is weak and the noise is large

Method used

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  • A Magnetic Concentration Pulse Eddy Current Coil Detection Sensor
  • A Magnetic Concentration Pulse Eddy Current Coil Detection Sensor
  • A Magnetic Concentration Pulse Eddy Current Coil Detection Sensor

Examples

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Embodiment

[0029] figure 1 It is a working principle diagram of a magnetic concentration pulse eddy current coil detection sensor of the present invention.

[0030] In this example, if figure 2 As shown, a magnetic concentration pulsed eddy current coil detection sensor of the present invention includes: an inner iron core 1 , a detection coil 2 , an inner shield 3 , an excitation coil 4 , an outer shield 5 and a casing 6 .

[0031] in, figure 2 (a) main view, figure 2 (b) is a top view, image 3 It is the real top view of the sensor without the housing. The sensor described in the present invention will be specifically described below in conjunction with these two figures.

[0032] The inner iron core 1 is a solid cylinder, located at the center of the entire sensor, and is made of ferromagnetic material with high magnetic permeability. In this embodiment, it is made of a ferrite bar to enhance the magnetic field strength. Improve the detection depth and detection signal streng...

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Abstract

The invention discloses a magnetic concentration pulsed eddy current coil detection sensor and a housing; a ferromagnetic material with high magnetic permeability is used as isolation between the excitation coil and the detection coil, and ferromagnetic material with high magnetic permeability is used outside the excitation coil The magnetic material is used as a shield to concentrate the distribution area of ​​the magnetic field generated by the excitation coil. Specifically, the signal source sends a square wave signal to the excitation coil, and the excitation coil generates a magnetic field under the drive of the square wave signal. When the detection coil detects the magnetic field generated by the excitation coil After the magnetic field, it is superimposed with the magnetic field generated by the measured component, and then the superimposed magnetic field is input to the data acquisition module through the terminal, and finally the collected detection signal is obtained through the host computer processing.

Description

technical field [0001] The invention belongs to the technical field of pulsed eddy current non-destructive testing, and more specifically relates to a magnetic concentration pulsed eddy current coil detection sensor. Background technique [0002] Non-destructive testing technology is based on the premise of not destroying the internal structure of the object to be tested, and uses physical methods to detect and evaluate possible defects inside the object. Eddy current is an important method among many categories of non-destructive testing methods. Its principle is to apply an alternating current at the end of the excitation coil to generate an alternating magnetic field. The magnetic field generates alternating eddy currents in the test piece. The eddy current in the medium generates a secondary magnetic field, and the detection sensor is used to detect the superimposed field of the source magnetic field and the secondary magnetic field, and through the analysis of the detec...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N27/90
CPCG01N27/9006
Inventor 高斌邓炜汤光平李建文孙朝明田贵云
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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