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Low-order torsional mode electromagnetic acoustic array transducer

A technology of array sensor and torsional mode, which is applied in the direction of ultrasonic/sonic/infrasonic generation to achieve high modal energy, uniform static magnetic field strength, and improved signal energy and signal-to-noise ratio

Active Publication Date: 2013-12-11
北京中盈盘古智能技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

So far, there have been few reports on sensors designed to excite the T(0,1) mode in pipelines based on the Lorentz force

Method used

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  • Low-order torsional mode electromagnetic acoustic array transducer
  • Low-order torsional mode electromagnetic acoustic array transducer

Examples

Experimental program
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Effect test

Embodiment

[0029] The device shown in the figure is used to achieve defect detection of alloy steel pipes.

[0030] For defect detection of alloy steel pipes, the electromagnetic acoustic array sensor that excites the T(0,1) mode, A, rubidium iron boron magnet array, B, racetrack coil, C, PPM electromagnetic acoustic sensor housing, D, flexible printed circuit board, E. Electromagnetic acoustic array sensor, F, impedance matching network, G, RPR-4000 high-energy pulse transmitter / receiver, H, digital filter, I, computer, J, alloy steel pipe.

[0031] The alloy steel pipe J, the specification is 42×5×1000 (unit: mm), the material is 12Cr1MoV alloy steel pipe, the density is 7.85g / cm3, and the Poisson's ratio is 2.7. Image 6 The dispersion curve of the torsion mode in the alloy steel pipe is given in the above parameters. For testing other specifications and material pipes, the parameters of the electromagnetic acoustic array sensor can be adjusted accordingly according to this example.

[003...

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Abstract

The invention discloses a low-order torsional mode electromagnetic acoustic array transducer which is characterized by comprising a plurality of PPM (Pulse Position Modulation) electromagnetic acoustic transducers, wherein each PPM electromagnetic acoustic transducer comprises a rubidium ferrum boron magnet array (A) and at least one runway type coil (B) in a flexible printed circuit board; the PPM electromagnetic acoustic transducers are uniformly distributed at the periphery of a ring pipe structure; adjacent magnets in the rubidium ferrum boron magnet arrays (A) generate static magnetic fields in opposite directions; the width of each magnet is equal to half of the T (0,1) mode wavelength at excitation frequency; the magnets are the same in shape, are in strip-type arc shapes, and are placed together tightly to form a tile shape; the centers of the rubidium ferrum boron magnet arrays (A) are coincided with those of the runway type coils (B); the runway type coils (B) are concentrated on one flexible printed circuit board (D); and the runway type coils (B) are connected in parallel. The low-order torsional mode electromagnetic acoustic array transducer can effectively excite and receive T (0,1) mode ultrasonic guided waves; when the transducer is mounted, the surface of a pipeline is not required to be treated; the accuracy of a result is high; the repeatability is good; and a detection process is convenient and quick.

Description

Technical field [0001] The invention belongs to the field of ultrasonic guided wave nondestructive testing, which can excite the T(0,1) mode in the pipeline and perform nondestructive testing on the pipeline. Background technique [0002] Ultrasonic guided wave technology has high-efficiency, rapid and large-scale defect detection capabilities, and can perform non-destructive testing of structural materials of plates, tubes and rods. Therefore, ultrasonic guided wave technology is widely used in non-destructive evaluation and health monitoring of various engineering structures. Among them, the guided wave method using axisymmetric longitudinal wave mode and torsional wave mode can realize the rapid and efficient detection of pipelines, especially the T(0,1) mode excited in the pipeline. The wave packet structure of the T(0,1) mode is simple and has non-dispersive characteristics, which enables the incident signal to maintain the signal waveform during the propagation process, and...

Claims

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Application Information

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IPC IPC(8): G01N29/34
Inventor 何存富胡跃刚焦敬品吴斌
Owner 北京中盈盘古智能技术有限公司
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