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Torsional mode magnetostriction sensor array

An array sensor and magnetostrictive technology, applied in the direction of magnetic materials, magnetic objects, permanent magnets, etc., can solve the problems of low energy conversion efficiency, improve energy and signal-to-noise ratio, arrange neatly, improve signal energy and signal The effect of the noise ratio

Active Publication Date: 2014-08-27
BEIJING UNIV OF TECH
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Problems solved by technology

However, compared with piezoelectric sensors, EMAT has lower energy conversion efficiency

Method used

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  • Torsional mode magnetostriction sensor array
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  • Torsional mode magnetostriction sensor array

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Embodiment Construction

[0037] The present invention will be further described below in conjunction with the accompanying drawings and examples, and the following examples are only descriptive and not restrictive, and cannot be used to limit the protection scope of the present invention.

[0038] like figure 1 , figure 2 Schematic diagram of the assembly and disassembly of the torsional mode magnetostrictive array sensor. The magnetostrictive sensor of the improved planar solenoid array MPSA coil is used as the array unit to form a circular array sensor suitable for pipeline detection, that is, the torsional mode magnetostrictive array sensor, including NdFeB magnet 1, sensor housing 2, and MPSA coil 3. Nickel belt4. The detection object is alloy steel pipe, the specification is (unit: mm), the material is 12Cr1MoV alloy steel pipe, the density is 7.85g / cm 3 , Poisson's ratio is 0.27. Image 6 The dispersion curve of the torsional mode in the alloy steel pipe 13 under the above parameters is g...

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Abstract

The invention discloses a torsional mode magnetostriction sensor array, and belongs to the field of ultrasonic non-destructive testing. According to the phenomenon that an SH wave vibration mode in a plate is similar to a torsional mode in a pipeline, an MPSA (modified planar solenoid array) coil suitable for pipeline configuration and array is provided, and the torsional mode magnetostriction sensor array is designed and researched to excite the torsional mode in a pipeline. Tests verify that a T (0, 1) mode can be excited on a pipeline by the researched torsional mode magnetostriction sensor array, and in the tests, the frequency response characteristic of the sensor array is tested. The sensor array is used for rapidly and effectively detecting the position of a defect in an alloy steel pipe, the positioning precision is relatively high, and a basis is established for implementing two-dimensional defect imaging in the pipeline by the sensor array combined with a phased array principle.

Description

technical field [0001] The invention relates to a torsional mode magnetostrictive array sensor, which belongs to the field of ultrasonic non-destructive testing, and can excite the ultrasonic guided wave of the torsional mode in the pipeline structure. Background technique [0002] Due to the advantages of large detection range, high efficiency, and small attenuation, ultrasonic guided waves are quite sensitive to structural surface defects and internal defects, and can realize effective detection of structures such as plates, shells, pipes, and rods, and have attracted widespread attention in recent years. . Because the propagation characteristics of ultrasonic guided waves (such as dispersion, multi-mode and attenuation, etc.) are directly related to its detection effect. Based on the propagation characteristics of the guided wave in the structure, it is very important to select the appropriate detection mode and frequency range. In pipeline structure detection, the low-...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N29/07H01F1/057H01F7/02
Inventor 刘增华樊军伟胡亚男张祯何存富吴斌
Owner BEIJING UNIV OF TECH
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