Magnetostrictive guided wave sensor

Abstract

The invention discloses a magnetostrictive guided wave sensor, which is prepared by fixing two permanent magnets with opposite polarity at lower ends at two sides of a supporting bracket, allowing a rotating bracket to pass through a central hole of the supporting bracket, locating the rotating bracket in a central hole of a heat-resistant insulation layer with embedded excitation coils, and attaching a Fe-Co-V disc on the lower surface of the heat-resistant insulation layer, wherein the rotating bracket can drive the supporting bracket to rotate, and the heat-resistant insulation layer is located between the two permanent magnets with opposite polarity. According to the invention, on basis of an action mechanism of magnetic field, force field, and heat field coupling, comprehensive quantitative characteristic models of ultrasonic guided wave and echo are analyzed and studied to form an ultrasonic guided wave sound field control theory and a method with comprehensively optimized properties such as information carrying integrity and sensitivity to various defects, and a phased array technique and a wavelet transformation technique are employed as strategies to achieve nondestructive examination for metal pipes by real-time quantitative magnetostrictive guided wave. The sensor can be applied for online detection of high temperature metal pipes.

Description

technical field [0001] The invention relates to a guided wave sensor, in particular to a magnetostrictive guided wave sensor used in online detection of high-temperature pipeline defects. Background technique [0002] High temperature (usually refers to working temperature higher than 100°C) metal pipes are widely used components in thermal power, nuclear power, refining, metallurgy, heating and other fields. Long-term operation under high temperature conditions is prone to fatigue, creep, corrosion, wear, etc. Failure, once the metal pipe leaks or breaks, it will cause a large loss of medium in the metal pipe, and may cause catastrophic accidents such as explosion and fire, directly affecting the safe operation of the equipment and causing great harm to the lives of personnel and the surrounding environment. There has always been a strong demand for online, real-time, accurate and convenient metal pipeline defect detection technology that is convenient for safety evaluation...

AI Technical Summary

Problems solved by technology

When the above technology uses magnetostrictive technology for detection, the designed excitation or receiving probe can only realize the excitation of a single mode, either the longitudinal mode or the torsional wave mode, and the defects of different directions and depths have different effects on different modes. Sensitivity to wave excitation is different, and defects in metal pipes are often irregular, requiring multiple modes (longitudinal wave mode, torsional wave mode, bending mode) composite inspection

At present, there is no sensor that can conveniently realize multiple excitation modes applied to the detection of metal pipelines

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