电工技术学报  2016, Vol. 31 Issue (1): 80-84    DOI:
电磁兼容 |
电磁超声检测系统中消除电磁干扰电路的设计
刘素贞1,李丽滨1,蔡智超1,张闯1,杨庆新1,2
1.河北工业大学电磁场与电器可靠性省部共建重点实验室 天津 300130
2.天津工业大学天津市电工电能新技术重点实验室 天津 300387
The Design for Electromagnetic Interference Eliminating Circuits in Electromagnetic Ultrasonic Testing Systems
Liu Suzhen1,Li Libin1,Cai Zhichao1,Zhang Chuang1,Yang Qingxin1,2
1.Province-Ministry Joint Key Laboratory of Electromagnetic Field and Electrical Apparatus Reliability Hebei University of Technology Tianjin 300130 China
2.Key Laboratory of Advanced Electrical Engineering and Energy Technology Tianjin Polytechnic University Tianjin 300387 China
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摘要 电磁超声技术作为一种非接触式探伤技术在恶劣工况条件下具有广泛的应用前景,然而其发射电路产生的以共模噪声为主的脉冲电磁干扰会影响检测电路的接收效果进而产生误检。针对该问题,设计了消除电磁干扰的硬件电路,构建了具有高速、高共模抑制比、高输入阻抗以及低噪等特点的复合仪表放大器。电路用高速低噪双通道ADA4817-2 作为输入增益级放大器,后接高共模抑制性能的AD8429仪表运放,提高了电路对噪声的抑制能力。在工况下进行测试,结果表明该电路能够实现共模噪声的有效消除。
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刘素贞
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杨庆新
关键词 电磁超声检测电磁干扰共模噪声复合仪表放大器    
Abstract:As a type of industrial non-contact detection method,electromagnetic acoustic transducer (EMAT) has a broad application prospect in harsh industrial conditions.However,the pulse electromagnetic interference (EMI),mainly the common-mode noise,produced by its emission circuit will affect the detection circuit and then generate false detection.Aiming at this problem,the hardware circuit is designed to eliminate the EMI.The composite instrumentation amplifier with the characteristics of high speed,high common mode rejection ratio,high input impedance,and low noise is designed.The high-speed circuit utilizes the low noise dual channel ADA4817-2 as the input gain amplifier and uses a high common mode rejection AD8429 instrument op-amp in the following stage,which improves the noise suppression capability.Through analyzing the test results in the harsh industrial conditions,the common-mode noise is effectively eliminated by the proposed circuit.
Key wordsElectromagnetic acoustic transducer    electromagnetic interference    common mode noise    composite instrumentation amplifier   
收稿日期: 2015-06-24      出版日期: 2016-01-21
PACS: TM133  
基金资助:国家自然科学基金(51307043)和河北省自然科学基金(E2016202260)资助项目。
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等。E-mail:szliu@hebut.edu.cn     E-mail: llb3_3_3@163.com
作者简介: 李丽滨 男,1991年生,硕士研究生,研究方向为电磁无损检测技术等。E-mail:llb3_3_3@163.com
引用本文:   
刘素贞,李丽滨,蔡智超,张闯,杨庆新. 电磁超声检测系统中消除电磁干扰电路的设计[J]. 电工技术学报, 2016, 31(1): 80-84. Liu Suzhen,Li Libin,Cai Zhichao,Zhang Chuang,Yang Qingxin. The Design for Electromagnetic Interference Eliminating Circuits in Electromagnetic Ultrasonic Testing Systems. Transactions of China Electrotechnical Society, 2016, 31(1): 80-84.
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