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
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.
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2016, Vol. 31 
