Torsional mode guided-wave magnetostrictive sensor based on double-ring permanent magnet array

Abstract

The invention provides a torsional mode guided-wave magnetostrictive sensor based on a double-ring permanent magnet array. The sensor mainly comprises two symmetrical semi-ring sensor components which are connected and coated on the pipeline surface through an elastic fastener. Each semi-ring sensor component mainly comprises a double-row permanent magnet array, two ferrocobalt strips, detection coils, a rubber shell and an epoxy resin layer; the two ferrocobalt strips are pre-bent into an arc to adapt to an outer diameter of a tested pipeline, and two sides are fixed by a molding base; the detection coil is wound on the two ferrocobalt strips in a fixed spacing manner, and alternating current is introduced to form an alternating magnetic field along the length direction of the ferrocobalt strips; rectangular permanent magnets in the double-row permanent magnet array are adsorbed on the outer sides of the ferrocobalt strips in the same direction, and a static magnetic field along the width direction of the ferrocobalt strips is provided. Alternating current signals with a phase difference of 90 degrees are introduced into two groups of detection coils in the sensors, and direction controllable torsional mode guided-waves are generated to be used for pipeline defect detection.

Description

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AI Technical Summary

Benefits of technology

This technology improves how an acoustic transducer works when excited at different frequencies for better performance or efficiency compared to traditional methods like piezoelectric ceramics. It also allows for easy replacement if needed without having to remove all parts from its original position.

Problems solved by technology

This patented describes a new type of device called a torque-mode guided sound wave (TG) magnetoacouscerierature system that has been developed over time. It includes detectors made up from ferrite or other materials embedded into plastic material placed inside pipelines. These devices use special techniques like inductor technology to generate signals when subjected to external force fields such as pressure pulses caused by explosions or natural phenomena like fires. They have potential applications in various industries including oil exploration and gas industry.

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