USB PC LabVIEW SignalExpress Labview Vi Fig. 1 EMAT system based on orthogonal lock-in 5 amplifier PCB 15

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1 Electri c Machines and Control Vol. 21 No. 9 Sep : ( electromagnetic acoustic transducer,emat), EMAT EMAT, EMAT, :, : DOI: /j. emc TG A X Design of characteristic signals detecting system for electromagnetic ultrasonic LIU Su-zhen 1 LI Li-bin 1 ZHANG Chuang 1 ZHANG Yan-wei 1 YANG Qing-xin 2 1. Province-Ministry Joint Key Laboratory of Electromagnetic Field and Electrical Apparatus Reliability Hebei University of Technology Tianjin China 2. Key Laboratory of Advanced Electrical Engineering and Energy Technology Tianjin Polytechnic University Tianjin China Abstract To solve the problem of low transduction efficiency weak signal and low signal-to-noise ratio SNR in electromagnetic acoustic transducer EMAT system the detection system was designed including EMAT low noise preamplifier broadband receiver and the orthogonal phase-locked amplifier based on the LabVIEW. The difference between the traditional EMAT structure and the new EMAT structure flux density was compared by increasing the intensity of the bias magnetic field can improve the efficiency of EMAT The frequency response characteristic of preamplifier broadband receiver and EMAT were analyzed. The impact of the order filter type and cut-off frequency of the low pass filter to detect the ultrasonic echo signal was studied. Results indicate that the system can achieve the goal of real-time acquisition storage and analysis of electromagnetic ultrasonic echo signal and improve the SNR and resolution of signals. Keywords EMAT SNR preamplifier broadband receiver orthogonal broadband receive : ( ) ( E ) ( 16JCYBJC19000) : ( 1969 ),,,, ( 1991 ),,, ( 1982 ),,,, ( 1988 ),,, ( 1961 ),,,, :

2 USB PC LabVIEW SignalExpress Labview Vi Fig. 1 EMAT system based on orthogonal lock-in 5 amplifier PCB 15 2 a 2 b Lab- VIEW SignalExpress Tone-Burst Tone-Burst EMAT 2 Fig. 2 EMAT A /D Structure chart of EMAT

3 d 16 4 COMSOL Multiphysics 40 mm 20 mm 10 mm 60 mm 50 mm 5 mm 0. 6 mm a EMAT 3 b EMAT 3 a 4 Fig. 4 Preamplifier block diagram Fig. 3 槡 3 3 AD8130 Magnetic field distribution of aluminium plate CMRR 2 MHz CMRR 80 db 10 MHz 70 db AD b 10 mm B > T M V N I N 18 V ' N = V N 槡 M 1 I ' N = 槡 M I N / 槡 mv

4 f BW1 = f H1 - f L1 = MHz 3 f L1 400 Hz f H MHz 40 db 4 MHz 38 db 240 Hz 3 MHz 5 Fig. 5 Preamplifier circuit Fig Amplitude-frequency curve of preamplifier 5 mv f BW2 = f H2 - f L2 = MHz 4 f L2 36 khz f H MHz 2 LC 5 LC π 50 Ω 8 7 Fig. 8 Amplitude-frequency curve of preamplifier of Broadband receiver Fig. 7 7 Broadband receiver

9 107 100 khz 10 MHz b 46 μs c 74 μs d 92 μs 2 Q 9 Fig. 9 Connection diagram of EMAT system LO-RF 5 MHz 5 MHz 5 LC 10 Fig.

5 khz 10 MHz b 46 μs c 74 μs d 92 μs 2 Q 9 Fig. 9 Connection diagram of EMAT system LO-RF 5 MHz 5 MHz 5 LC 10 Fig. 10 Original signal of electromagnetic acoustic A = 槡 V 2 I + V 2 Q 5 φ = arctan V I 6 V Q 1. 4 MHz V I V Q 2. 6 MHz 0. 1 MHz mm 200 mm 5 mm 15 mm 1 mm 5 mm 9 4 v m /s λ = mm λ 2 MHz3 Tone-Burst a 2 MHz Fig. 11 Amplitude-frequency curve of EMAT

6 khz 12 1 Hirao M 4. J Fig. 12 Output waveform of orthogonal lock-in WANG Shujuan KANG Lei ZHAI Guofu. Research on weak signal amplifier detection method for electromagnetic acoustic transducer J. Nondestructive Testing S = t v v J t YANG Lijian YU Ning XING Yanhao. The hardware processing technique on the echo signal of electromagnetic acoustic technique 1 S 1 S 2 J. Non-destructive Testing J % HAOKuansheng HUANG Songling ZHAO Wei et al. Calculation Technology Letters Khmelev V N Savin I Barsukov R V et al. Problems of electrical Table 1 Location of flaw and end plane position matching of electronic ultrasound frequency generators and electroacoustical transducers for ultrasound technological b c d installations t / μs S 1 /mm S 2 /mm /% Ogi H. EMATs for Science and Industry Noncontacting Ultrasonic Measurements M. New York Springer Science & Business Media Salzburger H J. EMAT's and its potential for modern nde-state of the art and latest applications C / /2009 IEEE International Ultrasonics Symposium. Rome Italy IEEE Ashigwuike E C Ushie O J Mackay R et al. A study of the transduction mechanisms of electromagnetic acoustic transducers EMATs on pipe steel materials J. Sensors and Actuators A Physical of coil impedance and matching capacitance for EMAT J. High C / /2004 International Siberian Workshop on Electron Devices and Materials Proceedings 5th Annual. Erlagol Altai Russia IEEE J HUANG Fengying ZHOU Zhenggan. Effect of static bias magnetic

7 9 109 field on electromagnetic acoustic transducer sensitivity J. Journal of Mechanical Engineering KANG L Dixon S WANG K et al. Enhancement of signal ampli- 9. tude of surface wave EMATs based on 3-D simulation analysis and J orthogonal test method J. NDT & E International HUANG Fengying GUO Ben GAO Donghai et al. Analysis of influence factors in electromagnetic acoustic electro-acoustic conversion efficiency J. Engineering and testing FANM CAO B YANG P et al. Elimination of liftoff effect using a model-based method for eddy current characterization of a plate J. NDT & E International Dutton B Boonsang S Dewhurst R J. A new magnetic configuration for a small in-plane electromagnetic acoustic transducer ap- 11. plied to laser-ultrasound measurements Modelling and validation J KANG Lei JIN Yu PAN Feng et al. Optimal design of meanderline-coil surface wave electromagnetic acoustic transducers J. Instrument Technique and Sensor J. 18. M WANG Shujuan LI Zhichao LI Zhanpeng et al. Receiving performance analysis and optimal design of surface wave electromagnetic acoustic transducers in nonferromagnetic materials J. Proceedings of the CSEE WANGS LI Z KANG L et al. Influence of Coil Parameters on Rayleigh Waves Excited by Meander-Line Coil EMATs M / /Intelligent Computing for Sustainable Energy and Environment. Springer Berlin Heidelberg J. Sensors and Actuators A Physical M M ( : )

2 193 EMAT F a λ 1 a λ 1 /2 EMAT 8 9 EMAT H = J C 1 B = μh EMAT E = - B 3 t J = γe F = J B + B S 5 H J C B μ EMAT E EMAT EMAT γ J ANSYS B

2 193 EMAT F a λ 1 a λ 1 /2 EMAT 8 9 EMAT H = J C 1 B = μh EMAT E = - B 3 t J = γe F = J B + B S 5 H J C B μ EMAT E EMAT EMAT γ J ANSYS B 342 2 0 1 2 3 Journal of Shenyang University of Technology Vo l 34 No 2 Mar 2 0 1 2 1000-1646 2012 02-0192 - 06 110870 ANSYS TB 552 A Three-dimensional finite element analysis on radiation sound field