Compound pressure-bearing equipment internal flaw detection system capable of combining flux leakage coarse detection with ultrasonic accurate measurement

Abstract

The invention discloses a compound pressure-bearing equipment internal flaw detection system capable of combining flux leakage coarse detection with ultrasonic accurate measurement. The system consists of a Hall element array, a U-shaped magnetic core, an exciting coil, a signal processor, a power supply module, a single chip microcomputer, a power amplifier stimulation end impedance matching device, an emission probe, a receiving probe and an upper computer, wherein the single chip microcomputer outputs a low-frequency alternating signal to the exciting coil; the U-shaped magnetic core is magnetized to enable the U-shaped magnetic core to form a local flux leakage environment with a construction member to be detected, a detected magnetic conduction component forms a leakage magnetic fieldon a defect position and is sensed by the Hall element array positioned in an area; after the detected magnetic conduction component is subjected to signal processing, the detected magnetic conduction component is sent into the upper computer to be processed so as to preliminarily give a damage position; and ultrasonic detection is used for accurately measuring the position to give a specific damage situation. The system combines coarse detection with accurate detection, is more flexible in checkout and higher in accuracy, and is an innovation for a traditional flux-leakage-based detection principle.

Description

technical field [0001] The invention belongs to the technical field of instruments and meters for non-contact metal detection, and in particular relates to a magnetic flux leakage nondestructive detection technology based on the principle of magnetic vacuum leakage combined with electromagnetic ultrasonic detection technology. Background technique [0002] Since American Hawke discovered the prototype of the principle of magnetic flux leakage detection, that is, magnetic particle detection, in 1922, the theory of magnetic flux leakage detection and its engineering application have been extensively studied. [0003] The corresponding theoretical research includes magnetic dipole and finite element method to solve the magnetic field static distribution problem, AMEET magnetic flux leakage reverse inversion problem, MUKHOPADHYAY, etc. The analysis of the relationship between the defect geometric parameters and its leakage field and scanning speed. [0004] The principle of magn...

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Problems solved by technology

[0005] Detectors under these theories often have weak leakage magnetic fields of defects, and the magnetic noise caused by the relative posture jitter between the probe and the object always exists, so that the detection method is always "zero" distance contact detection, and the detection of probe shoes Can only work close to the object to be tested

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