Electromagnetic inspection method based on hall sensor array and electromagnetic inspection system based on hall sensor array

Abstract

The invention relates to an electromagnetic inspection system which comprises a magnetic field generation device and a magnetic field detection device, wherein the magnetic field detection device inspects a magnetic induction component through detecting a magnetic field generated by the magnetic field generation device; the magnetic field generation device mainly comprises a full-bridge inverter, a main control chip, a cross magnet yoke and a power supply detection module, and is mainly used for generating an electromagnetic field for magnetizing a workpiece; and the magnetic field detection device comprises a hall sensor array, a data acquisition module, a data processing module and a data display module, and is used for detecting and displaying magnetic lines generated around the workpiece by the magnetic field generation device. By virtue of the electromagnetic inspection system, the defects of a magnetic powder inspection mode in a nondestructive detection process are overcome; the detection time and detection range of single charging are prolonged and improved; and the detection rate and detection speed of the single charging are increased.

Description

technical field [0001] The invention relates to a non-destructive testing system, in particular to an electromagnetic flaw detection method and system based on a Hall sensor array. Background technique [0002] As a mature non-destructive testing method, magnetic particle inspection has been widely used in various fields at home and abroad. The basic principle of magnetic particle inspection is: the magnetic permeability of ferromagnetic materials is much greater than that of non-ferromagnetic materials. To analyze the magnetic flux density β=μH, B magnetic force lines pass through the unit area of ​​the workpiece, but B magnetic force lines cannot be allowed to pass through the unit area of ​​the defect area, forcing a part of the magnetic force lines to squeeze into the material below the defect, and others The magnetic field lines have to be forced to escape from the surface of the workpiece to form magnetic flux leakage, and the magnetic powder will be attracted by the ...

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Problems solved by technology

These two methods have high requirements on the surface smoothness of the test piece, high requirements on the technology and experience of the test personnel, and the detection range is small and the speed is slow.

Regardless of whether it is a dry method or a wet method, the magnetic powder used for detection will be adsorbed on the surface of the detected workpiece due to its own remanence, which is not easy to be removed, which may affect the use of the workpiece. The remaining micro-magnetic marks will also affect the performance of magnetic particle inspection

On the other hand, this flaw detection method consumes a certain amount of magnetic powder and carrier liquid every time it is used, which causes huge waste, and the residual magnetic powder and carrier liquid will cause pollution

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