声发射传感器电路设计及信号处理  

Circuit Design and Signal Processing of Acoustic Emission Sensor

作　　者：刘启明 郭涛[1] 张程杰 古依聪 刘叶琦 LIU Qiming;GUO Tao;ZHANG Chengjie;GU Yicong;LIU Yeqi(State Key Laboratory of Electronic Test Technology,North University of China,Taiyuan 030051)

机构地区：[1]中北大学电子测试技术国家重点实验室,太原030051

出　　处：《舰船电子工程》2022年第5期170-175,共6页Ship Electronic Engineering

摘　　要：鉴于声发射传感器输出信号一般为毫伏级,对其进行放大的时候很有可能会把一些噪声信号进行放大,以及声发射传感器应用环境的恶劣性,将会直接导致后面处理的信号信噪比降低[1];在此,为了提高声发射传感器传输质量,对声发射前置放大电路进行优化,将传统的单端输入转换为双端输入,对共模信号进行抑制,提高信噪比,对各部分电路一一进行分析验证;此外,对声发射传感器输出声信号进行小波阈值去噪,论文选用了是全局阈值去噪和分层阈值去噪,进行择优选取,使得数据进一步提高,满足预定要求。Since the output signal of the acoustic emission sensor is generally in the millivolt level,it is likely that some noise signals will be amplified when it is amplified,and the harsh application environment of the acoustic emission sensor will directly lead to the reduction of the signal-to-noise ratio of the subsequent processing.In order to improve the transmission quality of the acoustic emission sensor,the acoustic emission preamplifier circuit is optimized,the traditional single-ended input is converted to double-ended input,the common mode signal is suppressed,and the signal-to-noise ratio is improved.The circuits are analyzed and verified one by one.In addition,wavelet threshold denoising is performed on the output acoustic signal of the acoustic emission sensor.In this paper,global threshold denoising and hierarchical threshold denoising are selected,and the preferred ones are select⁃ed to further improve the data and meet the predetermined requirements.

关 键 词：声发射 前置放大器 小波 阈值去噪 

分 类 号：TP212.1[自动化与计算机技术—检测技术与自动化装置] TN911.7[自动化与计算机技术—控制科学与工程]