Barrel curved surface electromagnetic ultrasonic variable incident angle body wave weighted and combined imaging detection method and device

Abstract

The invention discloses a barrel curved surface electromagnetic ultrasonic variable incident angle body wave weighted and combined imaging detection method and a barrel curved surface electromagneticultrasonic variable incident angle body wave weighted and combined imaging detection device. The barrel curved surface electromagnetic ultrasonic variable incident angle body wave weighted and combined imaging detection method comprises the steps of: introducing pulse current with the initial excitation frequency of f1 into an electromagnetic ultrasonic oblique incidence SV wave probe, and enabling the interior of a to-be-detected barrel to generate SV waves propagating along an incidence angle theta 1; receiving ultrasonic echoes and acquiring an A scanning signal by the electromagnetic ultrasonic oblique incidence SV wave probe; introducing pulse current with the excitation frequency fi=f1+deltaf*(i-1) into the electromagnetic ultrasonic oblique incidence SV wave probe in sequence, so that SV waves propagating along an incidence angle theta i are correspondingly generated in the to-be-measured barrel; and acquiring A scanning signals of the SV waves which are correspondingly generated by different excitation frequencies fi and propagated along the incident angle theta i, and performing weighted combination and coordinate correction to realize variable incident angle body wave weighted and combined B scanning imaging. By adjusting the excitation frequency, changing the incident angle of the oblique incident SV waves and carrying out weighted combination and coordinate correction on the obtained A scanning signals, B scanning imaging is realized, and the geometric information of the profile of a defect can be obtained.

Description

technical field [0001] The invention relates to the technical field of body barrel detection, in particular to a body wave weighted combined imaging detection method and device thereof for a curved surface of a body barrel by electromagnetic ultrasound with variable incident angles. Background technique [0002] As an important part of conventional weapons such as artillery and firearms, the safety of barrels is not only related to the safety of combatants, but also plays an important role in combat. During the shooting process, the body tube chamber is subjected to high temperature and high pressure, high-speed gunpowder gas, and warhead friction, etc., resulting in micro-cracks on the inner wall. The size and caliber of the chamber will change, which will cause the shell's exit angle and range to deviate from the expected value, reducing the combat accuracy of the shell. [0003] At present, the commonly used body inspection methods include CCD camera method, eddy current...

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Problems solved by technology

[0010] The above-mentioned patents are all based on the plane oblique incident body wave detection method, and the barrel has complex structures such as curved surfaces and variable diameters. The above-mentioned schemes cannot be applied to the imaging detection and in-situ detection of internal defects of the curved surface barrel.

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