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Omnidirectional horizontal shearing modal magnetostrictive sensor

A horizontal shearing and magnetostrictive technology, applied in the directions of ultrasonic/sonic/infrasonic waves, etc., can solve the problems of poor detection repeatability, high requirements for nickel sheet bonding, and difficulty in winding sensor coils. Signal-to-noise ratio, neatly arranged effect

Active Publication Date: 2015-08-05
BEIJING UNIV OF TECH
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AI Technical Summary

Problems solved by technology

In 2013, Y.Y.Kim et al. designed an omnidirectional SH by using a ring coil and a cylindrical permanent magnet wound on a nickel sheet. 0 Modal magnetostrictive sensor, but the coil winding of the sensor is difficult, and the requirements for nickel sheet bonding are high, and the detection repeatability is poor

Method used

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Embodiment Construction

[0031] The present invention will be further described below in conjunction with drawings and embodiments.

[0032] Based on the magnetostrictive effect, an omnidirectional horizontal shear mode magnetostrictive sensor is designed, and the sensor is used to excite a single-mode circumferentially consistent SH on the aluminum plate. 0 modal.

[0033] The structure diagram and decomposition diagram of the omnidirectional horizontal shear mode magnetostrictive sensor are as follows: figure 1 , 2 As shown, it includes a sensor housing 1, a NdFeB magnet 2, a spiral coil 3, and a circular nickel sheet 4. The detection object is an aluminum plate with a specification of 1000×1000×1 (unit: mm). Figure 5 are the dispersion curves of group velocity and phase velocity of the aluminum plate above. Use epoxy glue to bond the circular nickel sheet 4 on the surface of the aluminum plate, arrange the four fan-shaped NdFeB magnets 2 evenly in the circumferential direction on the circular ...

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Abstract

The invention discloses an omnidirectional horizontal shearing modal magnetostrictive sensor, and belongs to the field of ultrasonic non-destructive testing. The sensor comprises a sensor shell, a fan-shaped rubidium-iron-boron magnet, a manually wound spiral coil and a circular nickel plate, the circular nickel plate is adhered on the surface of an aluminum plate to be detected after the edge of the circular nickel plate is grinded, the sensor shell and the rubidium-iron-boron magnet are fixed right above the circular nickel plate, the circular nickel plate can generate shearing deformation based on the magnetostrictive effect of ferro-magnetic nickel and transmits the deformation to the aluminum plate, and an omnidirectional horizontal shearing mode SH0 is excited in a plate structure. An omnidirectional testing experiment verifies that the developed magnetostrictive sensor can excite the horizontal shearing mode SHO spreading along a 360-degree direction. By the aid of the developed omnidirectional horizontal shearing modal magnetostrictive sensor and an array combination imaging algorithm thereof, wide-range and high-efficiency defect imaging of the plate structure can be realized, and the sensor has great application values and potentials in the field of health monitoring and non-destructive evaluation for the plate structure.

Description

technical field [0001] The invention is an omnidirectional horizontal shear mode magnetostrictive sensor, which belongs to the field of ultrasonic nondestructive testing, and can excite SH propagating along a 360° direction in a plate structure. 0 Modal guided waves. Background technique [0002] Ultrasonic guided wave technology is an emerging non-destructive testing technology, which has the advantages of large detection range, high efficiency, and small attenuation. It is quite sensitive to structural surface defects and internal defects, and can realize the In recent years, the effective detection has received extensive attention. 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. Due to the low...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N29/34
Inventor 刘增华胡亚男吉美宁谢穆文刘秀成何存富吴斌
Owner BEIJING UNIV OF TECH
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