Aviation non-ferrousmagnetic metal pipe fitting corrosion defect inner inspection imaging probe and method

Abstract

The invention discloses an aviation non-ferrousmagnetic metal pipe fitting corrosion defect inner inspection imaging probe and a method. The probe comprises a pair of disk type exciting coils, an axial magnetic field gradient sensor array and a peripheral magnetic field gradient sensor array, wherein the disk type exciting coils are coaxially fixed on a photosensitive resin coil framework; the parameters of the pair of the disk type exciting coils are identical; the magnetic poles of the transient magnetic field excited by each coil are opposite; each of the axial magnetic field gradient sensor array and the peripheral magnetic field gradient sensor array comprises n equal-distance circumferential arrangement axial magnetic field gradient sensors uniformly distributed on the symmetrical surfaces of the pair of disk type exciting coils and a peripheral magnetic field gradient sensor; each axial magnetic field gradient sensor and the one peripheral axial magnetic field gradient sensor are positioned on the same radius of the circumferential arrangement. The invention also provides a detection method of the probe. The fast and high-precision imaging can be realized on the aviation non-ferrousmagnetic metal pipe fitting corrosion defects; the important engineering application values are realized.

Description

technical field [0001] The invention belongs to the technical field of non-destructive testing, and relates to an imaging probe and method for internal inspection of corrosion defects of aviation non-ferromagnetic metal pipe fittings. Background technique [0002] At present, aviation non-ferromagnetic metal pipe fittings are widely used in aircraft, aerospace / aircraft structures. The advantages of aviation non-ferromagnetic metal pipe fittings (such as aluminum alloy pipes, copper pipes, etc.) Reduce the structural weight of the aircraft, improve flight performance and increase economic efficiency. [0003] Due to complex environments such as high temperature and corrosion, aviation non-ferromagnetic metal pipe fittings are prone to corrosion defects during service. The existence of such defects reduces the service life of aviation non-ferromagnetic metal pipe fittings and seriously affects flight safety. It is of great significance to image the corrosion defects of aerosp...

AI Technical Summary

Problems solved by technology

[0003] Due to complex environments such as high temperature and corrosion, aviation non-ferromagnetic metal pipe fittings are prone to corrosion defects during service. The existence of such defects reduces the service life of aviation non-ferromagnetic metal pipe fittings and seriously affects flight safety. It is of great significance to image the corrosion defects of aerospace non-ferromagnetic metal pipe fittings

At present, the pulsed eddy current detection pick-up signals for corrosion defects of aviation non-ferromagnetic metal pipe fittings are mostly induced voltage signals and absolute magnetic field signals, and there is no related research on magnetic field gradient signals. There is still a gap in the research and engineering application of high-precision imaging

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