摘要
锁相放大技术能够从较强的背景噪声中提取具有固定频率的微弱信号幅值,从而在科学研究、工业生产中广泛使用。基于锁相放大技术基本工作原理,针对从强大背景噪声中提取具有一定重复频率的脉冲型信号进行仿真,研究从噪声背景中提取信号的极限性能,探索影响该性能的参数,包括积分时间、脉冲宽度、噪声类型等。仿真结果显示,锁相放大技术能够从均匀噪声环境中探测到的信号极限为-60.04 dB,在白噪声环境中的极限为-54.29 dB。该研究结果对于初步使用锁相放大技术提取微弱信号的参数选取、估测其信噪比和工作状况有一定的理论参考意义。
Lock-in amplifier technology can extract weak signal amplitude with fixed frequency from the strong background noise,thus it has been widely used in scientific research and industry.In this paper,based on the basic principle of lock-in technology,we simulate the extraction of a pulse signal with a certain repetition rate from the strong background noise,study the limitation performance,and investigate the parameters that affect the performance,including the integration time,the pulse width,and the noise types,etc.The simulation results show that the detection limitation of lock-in technology is-60.04 dB from the uniform noise environment and-54.29 dB from the white noise environment.These results will offer a theoretical reference for the preliminary use of lock-in technology to extract weak signal,help to estimate its work states and signal-to-noise ratio.
作者
龙江
朱思源
刘君威
吕金
杜海伟
LONG Jiang;ZHU Si-Yuan;LIU Jun-Wei;LV Jin;DU Hai-Wei(School of Measuring and Optical Engineering,Nanchang Hangkong University,Nanchang 330063,China;Key Laboratory of Nondestructive Testing(Ministry of Education),Nanchang Hangkong University,Nanchang 330063,China)
出处
《南昌航空大学学报（自然科学版）》
CAS
2022年第2期72-77,共6页
Journal of Nanchang Hangkong University(Natural Sciences)
基金
国家自然科学基金(12064028)
无损检测技术教育部重点实验室开放基金(EW202108218)。
关键词
锁相放大
微弱信号提取
极限性能
Lock-in technology
Weak signal extraction
Extreme performance
作者简介
通讯作者:杜海伟(1980-),男,博士,副研究员。主要研究方向:太赫兹技术及其应用,超快光学与超快现象、激光等离子体相互作用等。
