基于子母共位电磁超声换能器的平面波成像  

Plane wave imaging based on sub-parent common-position EMAT

作　　者：王星宇 郑阳[2] 周进节[1] 张宗健[2] 张吉堂[1] WANG Xingyu;ZHENG Yang;ZHOU Jinjie;ZHANG Zongjian;ZHANG Jitang(School of Mechanical Engineering,North University of China,Taiyuan 030051,China;China Special Equipment Inspection and Research Institute,Beijing 100029,China)

机构地区：[1]中北大学机械工程学院,山西太原030051 [2]中国特种设备检测研究院,北京100029

出　　处：《传感器与微系统》2023年第11期23-26,30,共5页Transducer and Microsystem Technologies

基　　金：国家自然科学基金资助项目(51605494)。

摘　　要：为了实现电磁超声相控阵单通道激励下的平面波成像(PWI),提升检测效率,设计了一种新型电磁超声相控阵换能器,命名为子母共位电磁超声换能器(EMAT)。该换能器将激发线圈与接收线圈分离,激发线圈为整体线圈,接收线圈为分离多通道线圈,两类线圈共用一组磁体。该换能器可降低实验仪器操作复杂性,使得不需要相控阵全通道激发,采用单通道激励即可以实现电磁超声平面波成像。本文使用子母共位电磁超声换能器对“斜向排列”的2 mm直径阶梯横通孔缺陷进行成像检测,结果表明:常规平面波算法检测的纵向定位误差在0.5 mm范围内,横向定位误差在2 mm范围内,采用相位相干算法可辅助提升成像信噪比(SNR),表明该类型换能器对于平面波成像快速检测是适用的。In order to realize plane wave imaging(PWI)under single-channel excitation of electromagnetic acoustic phased array and improve detection efficiency,a new type of electromagnetic acoustic phased array transducer is designed,named as sub-parent common-position electromagnetic acoustic transducer(EMAT).The transducer separates excitation coil from receiving coil,the excitation coil is a monolithic coil,and the receiving coil is a separate multi-channel coil,and the two types of coils share a set of magnets.The transducer can reduce the operation complexity of the experimental instrument,so that the phased array full channel excitation is not required,and the electromagnetic ultrasonic plane wave imaging can be realized by using single channel excitation.A sub-parent common-position EMAT is used for imaging detection of the"oblique array"of 2 mm diameter stepped cross-hole defects.The results show that the longitudinal positioning error detected by conventional plane wave algorithm is within 0.5 mm,and the transverse positioning error is within 2 mm.The phase coherence algorithm can help to improve the imaging signal-to-noise ratio(SNR).It shows that this type of transducer is suitable for rapid detection of PWI.

关 键 词：电磁超声换能器 无损检测 平面波成像 缺陷识别 

分 类 号：TP212[自动化与计算机技术—检测技术与自动化装置] TB552[自动化与计算机技术—控制科学与工程]