Characteristic Research and Analysis of EMATs Transduction Efficiency for Surface Detection of Aluminum Plate
Electromagnetic acoustic technique possesses many distinct advantages, such as being free of couplant, no requirement of test-piece preconditioning, and being able to excite pure surface acoustic wave, etc. It can effectively detect the surface and subsurface quality of aluminum plates, which is quite hard for the traditional piezoelectric technique. However, the deficiency of designing theories of electromagnetiC acoustic transducers (EMATs) leads to poor transduction efficiency of the transducers. Combining the practical detection requirements of aluminum plates, this paper built mathematical model of EMATs. Based on simulation of the model, we analyzed the distribution regularity of the eddy current, magnetic field, and Lorentz force produced by a surface wave EMAT. By studying the influence of EMAT parameters on the energy of the excited surface wave, we obtained the relationship between main structural parameters of the EMAT and the transducers transduction efficiency, which indicates that, the decrease of lift-off distance, coil conductors width, magnets length and width, and the increase of magnets thickness could effectively improve the transduction efficiency of the EMAT. Ultimately, validity and accuracy of the model was verified by experiment.
surface detection of aluminum plate electromagnetic acoustic transducer electromagnetic surface wave transduction efficiency.
Shujuan Wang Lei Kang Penghao Xin Guofu Zhai
School of Electrical Engineering and Automation,Harbin Institute of Technology Xidazhi Street 92,150001 Harbin,China
国际会议
2009 9th International Conference on Electronic Measurement & Instruments(第九届电子测量与仪器国际会议 ICEMI2009)
北京
英文
4177-4183
2009-08-16（万方平台首次上网日期，不代表论文的发表时间）