Circular-array-type magnetostriction sensor based on orthogonal encircling coil

Abstract

The invention relates to a circular-array-type magnetostriction sensor based on an orthogonal encircling coil. The circular-array-type magnetostriction sensor comprises a ferrocobalt band, a rectangular coil, a circular coil and a mechanical clamping device, wherein the rectangular coil and the circular coil are orthogonally encircled on the ferrocobalt band. The rectangular coil is preliminarily encircled on the ferrocobalt band, bonded through epoxy resin and solidified with an outside rubber layer to form a semi-cylindrical-shell detection unit. Two detection units are directly buckled or stuck to the surface of a structure such as a circular pipe and a circular rod by adopting epoxy resin and form an access after being connected through a conducting plug pin. The bar-type circular coil is encircled outside each detection unit and penetrates through the mechanical clamping device to form an access by adopting an adaptor; the mechanical clamping device can be used for applying radial load onto the circular coil and the detection units. The circular-array-type magnetostriction sensor can be used for exciting and receiving a torsional-mode ultrasonic guide wave in the circular pipe and the circular rod structure and has higher energy exciting efficiency; moreover, the structure is simple, multichannel excitation and receiving of the torsional-mode ultrasonic guide wave can be realized, and a foundation is provided for a focus imaging algorithm of the pipeline detection.

Description

Technical field: [0001] A circular array magnetostrictive sensor based on orthogonal surrounding coils belongs to the technical field of ultrasonic nondestructive testing, and its function is to excite and receive torsional mode ultrasonic guided waves in structures such as circular tubes and rods. Background technique: [0002] Ultrasonic guided wave technology has shown great potential in engineering applications, which can realize comprehensive and rapid scanning of structures such as plates, shells, pipes, and rods, and greatly improve detection efficiency. In addition, the defect signal obtained by guided wave detection has a high degree of recognition, and combined with the signal analysis method, high-precision positioning of defects can also be realized. With the use of alloy strips with high magnetostriction coefficients, it is easier to excite torsional mode ultrasonic guided waves in structures such as pipes. Conventional magnetostrictive sensors have been widely ...

AI Technical Summary

Problems solved by technology

Based on the structure of conventional magnetostrictive sensors, there are preliminary research reports on array sensors, but their structures are complex and the consistency between array elements is poor.

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