基于锁相放大的微弱信号检测电路研究  

作　　者：邹熙[1] 

机构地区：[1]武昌理工学院,430223

出　　处：《电子制作》2014年第13期26-27,共2页Practical Electronics

摘　　要：锁相放大器(lock-in amplifier)是通过互相关性原理,利用参考信号与被测信号的互相关性,提取出比被测信号强10000倍以上的干扰信号中检测出目的信号。为了更好的检测出被测信号,在锁相放大器原理的基础上,利用开关型相敏检波器(phase-sensitive detection)和直流放大器,实现双通道的锁相放大器。Lock-in amplifier is accomplished by cross-correlation principle, using the reference signal and the measured cross-correlation signal, extracts the signal strength than the interference signal over 100dB object detected signal. In order to detect the measured signal, the lock-in amplifier based on the principle,the use of phase-sensitive detector switch, and DC amplifier,dual-channel lock-in amplifier.

关 键 词：锁相放大器 相敏检波器 互相关性 

分 类 号：TN911.23[电子电信—通信与信息系统]