电磁超声导波大功率激励信号的线性放大方法

doi:10.3901/JME.2017.18.026

机械工程学报 ›› 2017, Vol. 53 ›› Issue (18): 26-34.doi: 10.3901/JME.2017.18.026

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电磁超声导波大功率激励信号的线性放大方法

周进节¹, 郑阳², 张宗健², 谭继东²

1. 中北大学机械与动力工程学院太原 030051;
2. 中国特种设备检测研究院国家质量监督检验检疫总局无损检测与评价重点实验室北京 100029

收稿日期:2016-06-28 修回日期:2017-01-04 出版日期:2017-09-20 发布日期:2017-09-20
通讯作者: 郑阳(通信作者),男,1984年出生,博士,高级工程师.主要研究方向为电磁超声、相控阵超声、超声导波、磁声多参数等检测方法,传感器与检测仪器开发等.E-mail:zhengyangchina@126.com
作者简介:周进节,男,1981年出生,博士,讲师.主要研究方向为超声无损检测新方法及其仪器研制.E-mail:zhoujinjiechina@126.com;张宗健,男,1990年出生,硕士,助理工程师.主要研究方向为电磁超声传感器研制及性能评估,电磁超声高温检测方法,声场仿真等.E-mail:tlzwzzj@163.com;谭继东,男,1988年出生,硕士,助理工程师.主要研究方向为电磁超声,磁声传感器及相关算法与软件技术等.E-mail:tanjidongchina@163.com
基金资助:
质检公益性行业科研专项（201410026、201510068）和国家重点研发计划课题（2016YFF0203003）资助项目。

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

ZHOU Jinjie¹, ZHENG Yang², ZHANG Zongjian², TAN Jidong²

1. School of Mechanical and Power Engineering, North University of China, Taiyuan 030051;
2. Key Laboratory of Nondestructive Testing and Evaluation of AQSIQ, China Special Equipment Inspection and Research Institute, Beijing 100029

Received:2016-06-28 Revised:2017-01-04 Online:2017-09-20 Published:2017-09-20

摘要/Abstract

摘要： 针对电磁超声导波大功率激励信号的线性放大问题，研究采用多个功率场效应管线性放大并联输出电路作为功率输出级，以提高线性放大后信号输出功率的方法。采用前级场效应管线性放大电路源极驱动方式为功率输出级电路设置静态工作点，并提供瞬态交流输入信号。采用差分结构配置整个电路以抑制开关特性引起的抖动，从而实现低功耗、大瞬态输出功率的线性放大电路的设计。试验结果表明，该线性放大电路能驱动中心频率为180 kHz的电磁超声传感器，且能获得高信噪比的导波检测信号；在驱动50Ω标准负载时能输出瞬态功率可达1.8 kW的导波激励信号，且波形失真小。所提出的电磁超声导波大功率激励信号的线性放大方法能有效指导该类电路的设计。

关键词: 大功率, 电磁超声导波, 激励信号, 线性放大

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

中图分类号:

TB132
TB553

周进节, 郑阳, 张宗健, 谭继东. 电磁超声导波大功率激励信号的线性放大方法[J]. 机械工程学报, 2017, 53(18): 26-34.

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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电磁超声导波大功率激励信号的线性放大方法

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

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