电工技术学报  2019, Vol. 34 Issue (20): 4171-4178    DOI: 10.19595/j.cnki.1000-6753.tces.181171
电工理论与新技术 |
高能脉冲激励下的电磁超声响应特性
刘素贞1,2, 王文杰1,2, 张闯1,2, 金亮3, 杨庆新1,2
1. 省部共建电工装备可靠性与智能化国家重点实验室(河北工业大学) 天津 300130;
2. 河北省电磁场与电器可靠性重点实验室(河北工业大学) 天津 300130;
3. 天津工业大学电工电能新技术天津市重点实验室 天津 300387
Electromagnetic Ultrasonic Transducer Response Characteristics Excited by High Energy Pulses
Liu Suzhen1,2, Wang Wenjie1,2, Zhang Chuang1,2, Jin Liang3, Yang Qingxin1,2
1. State Key Laboratory of Reliability and Intelligence of Electrical Equipment Hebei University of Technology Tianjin 300130 China;
2. Key Laboratory of Electromagnetic Field and Electrical Apparatus Reliability of Hebei Province Hebei University of Technology Tianjin 300130 China;
3. Key Laboratory of Advanced Electrical Engineering and Energy Technology Tianjin Polytechnic University Tianjin 300387 China
全文: PDF (53659 KB)  
输出: BibTeX | EndNote (RIS)      
摘要 

常规电磁超声换能器(EMAT)激发和接收的超声信号幅值较小、信噪比较低,为此设计一种新型无静态偏置磁场的高能超声激励系统,其核心为高能脉冲激励电源。新型高能脉冲激励电源采用LC振荡电路对激励线圈施加瞬态高电压,其在激励线圈内产生上千安电流,远大于常规EMAT激励线圈中电流,可以大大提高超声波信号的强度并有效地减小换能器体积。该文通过研究高能脉冲激发超声波的机理,得到高能脉冲电磁超声换能器在换能过程中磁场、力场、声场的变化规律,设计以激励A0为主模态的Lamb波的高能脉冲电源,并进行高能脉冲激励下的电磁超声实验。实验结果表明,在提离距离小于2mm时,以A0为主模态的Lamb波具有高信噪比,且能对缺陷精确定位,在检测微裂纹缺陷上更具有优势。

服务
把本文推荐给朋友
加入我的书架
加入引用管理器
E-mail Alert
RSS
作者相关文章
刘素贞
王文杰
张闯
金亮
杨庆新
关键词 高能脉冲电源电磁超声提离距离缺陷检测    
Abstract

The transmitted and received ultrasonic intensities of conventional electromagnetic ultrasonic transducer (EMAT) has small amplitudes and low signal-to-noise ratios. A concept for a novel high - energy ultrasonic excitation system without static magnetic field is presented, and its core is high-energy pulse excitation power supply. The novel high-energy pulse excitation power supply applies a transient high voltage to the excitation coil by a LC oscillator circuit and generates thousands of amps of current in the excitation coil, which is much larger than the current in the conventional EMAT excitation coil. The intensity of ultrasonic signals can be greatly increased and the transducer volume can be effectively reduced. The mechanism of high-energy pulse excitation of ultrasonic waves was studied in this paper. The variation law of magnetic field, force field and sound field of the high-energy pulsed EMAT during the transduction process was then obtained. High-energy pulsed power supply excited the Lamb wave with A0 mode as the main mode, and the electromagnetic ultrasound experiment under the excitation of high-energy pulse was performed. The experimental results show that when the lift-off distance is less than 2mm, the Lamb wave with A0 mode as the main mode has high signal-to-noise ratio and can accurately locate the defect, which has more advantages in detecting micro-crack defects.

Key wordsHigh-energy pulse power supply    electromagnetic ultrasonic transducer    lift-off distance    defect detection   
收稿日期: 2018-07-05      出版日期: 2019-10-30
PACS: TB55  
基金资助:

国家自然科学基金(51777052)、天津市自然科学基金(16JCYBJC19000)、河北省自然科学基金(E2017202055)和河北省高校科研重点项目(ZD2018214)资助

通讯作者: 刘素贞 女,1969年生,博士,教授,博士生导师,研究方向为工程电磁场与磁技术。E-mail: szliu@hebut.edu.cn   
作者简介: 王文杰 男,1993年生,硕士研究生,研究方向为电磁无损检测技术。E-mail: 18332553902@163.com
引用本文:   
刘素贞, 王文杰, 张闯, 金亮, 杨庆新. 高能脉冲激励下的电磁超声响应特性[J]. 电工技术学报, 2019, 34(20): 4171-4178. Liu Suzhen, Wang Wenjie, Zhang Chuang, Jin Liang, Yang Qingxin. Electromagnetic Ultrasonic Transducer Response Characteristics Excited by High Energy Pulses. Transactions of China Electrotechnical Society, 2019, 34(20): 4171-4178.
链接本文:  
https://dgjsxb.ces-transaction.com/CN/10.19595/j.cnki.1000-6753.tces.181171          https://dgjsxb.ces-transaction.com/CN/Y2019/V34/I20/4171