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Magnetism gathering type eddy current sensor

An eddy current sensor and magnetic gathering technology, which is applied in the direction of material magnetic variables, etc., can solve the problems of low signal strength and detection sensitivity

Pending Publication Date: 2021-05-11
BEIJING UNIV OF TECH
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  • Abstract
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Problems solved by technology

[0005] The purpose of the present invention is to propose a high-sensitivity magnetic-concentration eddy current sensor for coating defect detection, aiming at the problems of low signal strength and detection sensitivity of ordinary coils, and improving the signal amplitude from two aspects of the excitation signal and the receiving signal

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  • Magnetism gathering type eddy current sensor
  • Magnetism gathering type eddy current sensor
  • Magnetism gathering type eddy current sensor

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Embodiment Construction

[0025] The present invention will be further described below in conjunction with the accompanying drawings and examples, and the following examples are only descriptive and not restrictive, and cannot be used to limit the protection scope of the present invention.

[0026] The schematic diagram of the structure of the magnetic-condensation eddy current sensor is as follows: figure 1 shown. The sensor includes an excitation coil 1 , a coil bobbin 2 , a Hall sensor 3 , a funnel-shaped magnetic shield 4 and a cylindrical ferrite core 5 . The detection object is No. 45 steel sprayed with iron-based amorphous coating, and the specification is 100×50×10 (unit: mm). The excitation coil is funnel-shaped, and the bottom inner diameter, outer diameter, height and wire diameter of the coil play a decisive role in the induced eddy current density and the secondary magnetic field strength in the test piece. The specific size is determined according to the simulation results. According to...

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Abstract

The invention discloses a magnetism gathering type eddy current sensor. The sensor is a magnetic focusing eddy current sensor formed by combining an exciting coil, a coil framework, a Hall sensor, a funnel-shaped magnetic shielding cover and a ferrite magnetic core. Because the magnetic core, the magnetic shielding cover and other structures are added, magnetic lines of force are bound in the sensor, and the magnetic leakage effect and the background magnetic field are reduced. And the structure of the funnel-shaped exciting coil is introduced, so that a magnetic field gathering effect can be achieved, the magnetic field at the central position of the sensor can be enhanced along with the increase of the inclination angle, and the signal intensity is improved. According to the sensor, the defect detection capability is improved from two aspects of exciting signals and receiving signals, the identification rate of tiny defects of a coating is effectively improved, and the sensitivity of detection signals is enhanced.

Description

technical field [0001] The invention relates to a magnetism-concentrating eddy current sensor for coating detection, which belongs to the technical field of electromagnetic nondestructive testing. Because the center of the magnetic field area is concentrated, the recognition rate of tiny defects can be effectively improved, and the sensitivity of detection signals can be enhanced. Background technique [0002] During the preparation process of the coating, defects such as tiny cracks and pores often appear. The expansion of cracks will lead to delamination of the coating, and vertical cracks will lead to structural failure. At present, the most commonly used equipment testing coating methods include: eddy current testing, metallographic testing, terahertz testing, ultrasonic technology, infrared testing, etc. Although the measurement error of metallographic testing is relatively small, reaching the micron level, the production and processing process of the experimental speci...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/90
Inventor 龚裕黄晓菲刘增华陈政宇田九洲何存富
Owner BEIJING UNIV OF TECH
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