A Large Lift-Off Nondestructive Testing Method Based on the Interaction Between AC Magnetic Field and MFL Field

被引：1

作者：

Wang, Rongbiao ^{[1
]}

Deng, Zhiyang ^{[1
]}

Liu, Rui ^{[1
]}

Kang, Yihua ^{[1
]}

Zhang, Jikai ^{[1
]}

Tang, Jian ^{[1
]}

机构：

[1] Huazhong Univ Sci & Technol, State Key Lab Digital Mfg Equipment & Technol, Wuhan, Peoples R China

来源：

ELECTROMAGNETIC NONDESTRUCTIVE EVALUATION XXII | 2019年 / 44卷

关键词：

Large lift-off; Eddy Current Probes; MFL; EDDY-CURRENT;

D O I：

10.3233/SAEM190009

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

The magnetic leakage field of the crack gets weaker rapidly as the lift-off value increases, which makes the detection more difficult, especially for many insulated pipes. On the other hand, for eddy current testing, the AC magnetic flux of the excitation coil decreases exponentially with respect to the probe lift-off value, meanwhile, the surface eddy current density decreases rapidly according to the law of electromagnetic induction. To achieve the inspection in a large lift-off, a large life-off NDT method based on the interaction between AC Magnetic field and MFL field is proposed. A series of simulations and experiments are conducted to verify its feasibility.

引用

页码：44 / 49

页数：6

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