Linear Amplification Method of High Power Signal for Exciting Electromagnetic Acoustic Transducer to Generate Guided Wave

doi:10.3901/JME.2017.18.026

Abstract

Abstract: High power linear amplifier for exciting electromagnetic acoustic transducer to generate guided waves is investigated. Linear amplification circuit with multiple power MOSFETs operating in parallel is used as the output stage of the linear amplifier in order to improve the output power of the amplified signal. The static operating point of the power output stage circuit is set up by the DC bias from the source of MOSFET driving circuit working in linear amplification mode, and the source also provides the AC input signal for the power output stage. Differential structure is used to configure the whole circuit for suppressing the jitter caused by switching characteristics, so a linear power amplifier with low power consumption and large transient output power is designed. The experiment result shows this high power linear amplifier can drive an EMAT with center frequency of 180 kHz to generate guided wave and get good SNR inspection signals. When it is used to driven 50Ω standard load, the transient output power can access 1.8 kW with very small waveform distortion. The high power linear amplification method for driving EMAT produce guided provides effective guide for the similar circuit design.

Key words: electromagnetic ultrasonic guided waves, excitation signal, high power, linear amplification

CLC Number:

TB132
TB553

ZHOU Jinjie, ZHENG Yang, ZHANG Zongjian, TAN Jidong. Linear Amplification Method of High Power Signal for Exciting Electromagnetic Acoustic Transducer to Generate Guided Wave[J]. Journal of Mechanical Engineering, 2017, 53(18): 26-34.

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