摘要
在实际应用中,电磁超声换能器EMAT(Electromagnetic Acoustic Transducer)的转换效率低是一个普遍存在的问题。为了提高接收信号的幅度,通过两种永久磁铁结构对比后,提出一种基于Halbach阵列的永磁铁的新型结构模型。对磁铁的提离距离进行仿真实验,结果表明最合适提离距离为2 mm。通过理论计算与有限元方法验证了其结构的可行性与有效性,信噪比是传统EMAT结构的1.9倍。新型EMAT结构验证实验结果表明,接收信号信噪比为传统EMAT结构1.77倍,信噪比误差在7%以内。
The low conversion efficiency of electromagnetic acoustic transducer(EMAT)is a common problem in practical application.After comparing two permanent magnet structures,a new structural model of a permanent magnet based on the Halbach array is proposed for improving the amplitude of the received signal.The lift-off distance is simulated and experimented,and the most suitable lift-off distance is 2 mm.Through theoretical calculations and simulation of the finite element method,the feasibility and effectiveness of the structure are verified.The signal-to-noise ratio(SNR)is 1.9 times of the traditional EMAT structure.The results of the new EMAT structure verification experiment show that the signal-to-noise ratio of the received signal is 1.77 times of the traditional EMAT structure and the SNR error is within 7%.
作者
唐东林
侯军
TANG Donglin;HOU Jun(College of Mechanical and Electrical Engineering,Southwest Petroleum University,Chengdu 610500,China)
出处
《传感技术学报》
CAS
CSCD
北大核心
2018年第10期1489-1493,共5页
Chinese Journal of Sensors and Actuators
基金
四川省科技厅科技支撑计划项目(2017FZ0033)
