Device detecting magnetic conduction component defect based on magnetic striction torsion wave

Abstract

A device to detect defects of magnetic conducting structures based on magnetoconstriction torsional waves belongs to an ultrasonic nondestructive detector, which overcomes shortcomings of high guide wave attenuation of vertical mode and remarkable frequency dispersion effect. During detection, it is unnecessary to process surfaces of the structure. The present invention comprises a pulse signal generator, a power amplifier, a magnetoconstriction torsional wave sensor, a signal preprocessor, an A/D converter and a computer. Wherein, the magnetoconstriction torsional wave sensor is composed of an excitation unit and a receiving unit. The computer controls generation of pulse signals. The pulse signal is amplified by the power amplifier and then generates torsional waves in the structure through the excitation unit. The receiving unit receives the torsional wave from the structure, which is processed by the signal preprocessor and then converted into digital signals by the A/D converter. The computer obtains defect information of the structure. The present invention can conveniently excite and receive torsional waves, detect defects along axis of the structure and adapt to long-distance detection of clad pipes and cables with PE jacket.

Description

technical field [0001] The invention belongs to an ultrasonic nondestructive testing device, in particular to a device for detecting defects of components such as pipelines and stay cables based on magnetostrictive guided waves. Background technique [0002] In the prior art, the detection of defects in pipes, steel rods, steel wire ropes and similar magnetically permeable components mainly uses methods such as magnetic powder, eddy current, and ultrasound. One problem with the above method is that if a specific part of the component is to be detected, the sensor must be placed or scanned over the corresponding position. However, some positions are inaccessible in actual use, such as the peach-shaped ring of the steel wire rope, and the pipeline buried deep in the ground. These parts are often the key parts in use. Ultrasonic guided waves have the advantages of a little excitation and can detect a certain distance, and are gradually applied to detection practice. Patent No....

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Problems solved by technology

Patent Application No. 200480038549.4 discloses a method and system for torsional wave detection of heat exchange tubes. It mainly uses a guided wave probe scheme to generate and receive torsional wave signals from the inside of the tube to detect defects. Excite and receive torsional waves outside the pipeline, and the inner surface of the component must be treated when testing the component

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