一种可抑制电磁冲击盲区的新型电磁超声检测技术研究
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TH87TP2129TP211+5

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国家自然科学基金(51677158)项目资助


Research on a new electromagnetic acoustic detection technique for restraining the electromagnetic interference blind zone
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    摘要:

    电磁超声检测中,激发(TX)线圈利用强脉冲电流激励超声波的同时,会对接收(RX)线圈造成电磁冲击。在电磁冲击期间,RX线圈无法工作并需要稳定时间,从而形成电磁冲击盲区。针对此问题,提出一种可抑制电磁冲击盲区的新型电磁超声检测技术,该技术中采用了一种特殊RX线圈结构。一方面,该线圈结构中相邻线段之间间距满足超声波相长干涉的匹配关系;另一方面,该线圈与TX线圈的互感为0,使其能从电磁超声的脉冲激励系统中退耦。分析了所提新型电磁超声检测技术抑制电磁冲击的原理,并从理论上给出了该特殊RX线圈的设计方法。最后,通过实验表明该技术对电磁冲击抑制达到948%,从而验证了有效性。

    Abstract:

    For the electromagnetic acoustic testing, the transmitter coil utilizes the strong pulse current that excites the ultrasonic wave. It will cause the electromagnetic interference on the receiver coil. During the period of electromagnetic interference, the receiver coil is out of order and needs time to be stable. Thus, there is the electromagnetic interference blind zone. To solve this problem, this study proposes a new electromagnetic acoustic testing technique to restrain the electromagnetic interference blind zone. In this technique, a special receiver coil is utilized. On one hand, the distance between two adjacent lines in the coil structure satisfies the acoustic inphase matching relationship. On the other hand, the mutual inductance between the receiver coil and the transmitter coil is 0. In this way, it can be decoupled from the pulse excitation system. This study analyzes the principle of restraining the electromagnetic interference by the new technique. The theoretical design method of the special receiver coil is illustrated. Finally, by using this technique, the electromagnetic interference is suppressed by 948%, which proves its effectiveness.

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吴德会,黄超,杨凡,杨嘉欣.一种可抑制电磁冲击盲区的新型电磁超声检测技术研究[J].仪器仪表学报,2019,40(12):64-70

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  • 在线发布日期: 2022-04-19
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