Permanent magnet-based magnetic saturation pulsed eddy current infrared nondestructive evaluation method

A technology of pulsed eddy current and evaluation method, which is applied in the direction of coil device, induction heating, material defect testing, etc. It can solve the problems of difficult detection of defects and small penetration depth, and achieve fast detection speed, large detection depth and large observation range Effect

Pending Publication Date: 2020-11-24
RES INST OF NUCLEAR POWER OPERATION +2
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Problems solved by technology

[0004] Since the excitation frequency used by pulsed eddy current infrared is very high, and the relative magnetic permeability of ferromagnetic materials is very large, the penetration depth of the eddy current field is small when using puls

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  • Permanent magnet-based magnetic saturation pulsed eddy current infrared nondestructive evaluation method
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  • Permanent magnet-based magnetic saturation pulsed eddy current infrared nondestructive evaluation method

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Embodiment Construction

[0033] Below in conjunction with accompanying drawing and specific embodiment the present invention is described in further detail:

[0034] for figure 1 The ferromagnetic material tested piece shown in, the detection step of the inventive method is: as figure 1 The experimental device used in the method shown is composed of a computer, a program controller, an induction heater, a cooling device, a heating head, a heating coil, a permanent magnet and an infrared thermal imager. according to figure 1 The connection mode shown connects the computer to the program controller, and the computer synchronously triggers the induction heater and the infrared camera connected to the program controller through the program controller. When the induction heater receives the trigger signal, it applies a pulse current excitation to the heating coil connected to the heating head. The induction heater, the heating head and the heating coil are all connected with the cooling device, and the ...

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Abstract

The invention discloses a permanent magnet-based magnetic saturation pulsed eddy current infrared nondestructive evaluation method. Firstly, a computer controls a program controller to synchronously trigger an induction heater and a thermal infrared imager, the induction heater applies pulse current excitation to a heating coil connected with a heating head while receiving a trigger signal, and acooling device cools the induction heater, the heating head and the heating coil at the same time; a strong static magnetic field is generated around the permanent magnet, a ferromagnetic material reaches magnetic saturation under the action of a permanent magnet, then joule heat is generated under the action of the heating coil, and the surface temperature of the material is changed through heatconduction; and finally, temperature changes are collected through a thermal infrared imager, and defect nondestructive evaluation is conducted on the ferromagnetic material by analyzing the collectedimage sequence. Compared with a traditional pulsed eddy current infrared nondestructive detection method, the method has the advantages that the detection depth of the ferromagnetic material is larger, and the application prospect is wide.

Description

technical field [0001] The invention relates to the field of pulsed eddy current infrared nondestructive detection of ferromagnetic material defects, in particular to a magnetic saturation pulsed eddy current infrared nondestructive evaluation method based on permanent magnets. Background technique [0002] Ferromagnetic materials are one of the main pillar materials of modern industrial and agricultural production. The products of ferromagnetic materials are indicators of a country's economic development, and their demand can roughly reflect the national living standards of a country. As a basic functional material, ferromagnetic materials are used in all aspects of life. At present, ferromagnetic materials are mainly used in telecommunications, motors, televisions and computer storage devices. Various defects in ferromagnetic materials and workpieces are serious hidden dangers in modern industrial equipment, products and weapons. Therefore, in industrial production, ferrom...

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Application Information

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IPC IPC(8): G01N25/72H05B6/06H05B6/10H05B6/36
CPCG01N25/72H05B6/06H05B6/10H05B6/36
Inventor 韩捷仝宗飞解社娟陈洪恩裴翠祥陈振茂
Owner RES INST OF NUCLEAR POWER OPERATION
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