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Speed Measurement Feasibility by eddy current effect in the High-Speed MFL Testing

Structural Durability & Health Monitoring 2023年第4期17卷 299-314页

作者： Zhaoting Liu Jianbo Wu Sha He Xin Rao Shiqiang Wang Shen Wang Wei Wei School of Mechanical Engineering Sichuan UniversityChengdu610065China Safety Environment Quality Surveillance and Inspection Research Institute of CNPC Chuanqing Drilling&Exploration Guanghan618300China Chengdu Xionggu Oil&Gas Technology Co. Ltd.Chengdu610000China Chengdu Institute of Special Equipment Inspection and Testing Chengdu610036China

It is known that eddy current effect has a great influence on magnetic flux leakage testing(MFL).Usually,contacttype encoder wheels are used to measure MFL testing speed to evaluate the effect and further compensate testing signals.This speed measurement method is complicated,and inevitable abrasion and occasional slippage will reduce the measurement accuracy.In order to solve this problem,based on eddy current effect due to the relative movement,a speed measurement method is proposed,which is contactless and simple.In the high-speed MFL testing,eddy current induced in the specimen will cause an obvious modification to the applied field.This modified field,which is measured by Hall sensor,can be utilized to reflect the moving speed.Firstly,the measurement principle is illustrated based on Faraday’s law.Then,dynamic finite element simulations are conducted to investigate the modified magnetic field distribution.Finally,laboratory experiments are performed to validate the feasibility of the proposed method.The results show that Bmz(r1)and Bmx(r2)have a linear relation with moving speed,which could be used as an alternative measurement parameter.

关键词： Magnetic flux leakage testing(MFL) speed measurement eddy current effect modified magnetic field

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Design and ﬁrst result of combined Langmuir-magnetic probe on J-TEXT tokamak

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Plasma Science and Technology 2022年第5期24卷 39-47页

作者：杨庆虎陈志鹏郝志刚赵扬明徐鑫李述豪阳杰严伟江中和陈忠勇王能超杨州军潘垣丁永华 the J-TEXT Team International Joint Research Laboratory of Magnetic Conﬁnement Fusion and Plasma Physics State Key Laboratory of Advanced Electromagnetic Engineering and TechnologySchool of Electrical and Electronic EngineeringHuazhong University of Science and TechnologyWuhan 430074People’s Republic of China

In order to measure boundary electrostatic and magnetic fluctuations simultaneously,a combined Langmuir-magnetic probe(CLMP)has been designed and built on joint-Texas experimental tokamak.The probe consists of 8 graphite probe pins and a 3D magnetic probe,driven by a mechanical pneumatic device.By means of simulation,the shielding effect of the graphite sleeve on the magnetic fluctuation signal is explored,and the influence of the eddy current was reduced by cutting the graphite sleeve.In the experiment,it has been verified that the mutual inductance of electromagnetic signals can be ignored,and a 70–90 k Hz electromagnetic mode is observed around the last closed magnetic surface.The establishment of CLMP provides data for the exploration of the coupling of electrostatic and magnetic fluctuations.

关键词： J-TEXT Langmuir probe magnetic probe eddy current effect electromagnetic mode

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