采用RLC激励的EMAT圆柱探头设计参数分析

摘要

电磁超声换能器( EMAT)的线圈探头是激发和接收检测信号的传感器,为获得满足检测需要的具有一定频率和幅值的超声信号,需要对线圈探头进行合理的结构设计,以提高检测效率.在介绍RLC脉冲激励源原理的基础上,提出了空心圆柱线圈探头,并针对探头在激励和换能过程中的双重作用,详细分析了线圈探头的各种参数对激励信号源和检测效能的影响,为采用RLC脉冲放电激励的线圈探头设计提供了理论和实际指导.依据分析结果,设计了探头线圈和实验检测系统,证明了理论分析的正确性.%EMAT is a transducer used to inspirit and receive testing signal, in order to get ultrasound signal with certain frequency and amplitude, it' s necessary to design rationally coil probe for improving testing efficiency. Hollow cylinder coil probe on the basis of introducing principle of RLC impulse excitation source is proposed. Effect of that kinds of coil parameters on inspiriting signal source and testing effect is analyzed particularly. Aiming at double function between inspiriting and energy conversion of probe, which provides theoretical and practical guidance for design of coil probe by RLC impulse exciting source. Probe coil and experimental testing system are designed according to analysis results, experiment proves the correctness of theoretical analysis.