微弱信号锁相检测的电路研究  

Research on Weak Signal Detecting Circuit with Lock-in Amplifier

作　　者：杨行[1] 杨嵩[2] 刘艺[1] 

机构地区：[1]电子科技大学物理电子学院,四川成都610054 [2]中国电子科技集团公司第二十六研究所,重庆400060

出　　处：《压电与声光》2015年第3期529-532,共4页Piezoelectrics & Acoustooptics

摘　　要：在利用红外光谱技术进行工业检测的系统中,有用信息通常是淹没在强噪声背景中的微弱信号,因此可采用微弱信号检测技术中的锁相放大器来实现有用信号的提取。该文阐述了微弱信号检测的基本原理,比较了不同参考波形的优劣。设计运用AD630作为相关乘法器的锁相放大器,实现了在强噪声环境中有效地提取信号。测试结果表明,该电路结构简单,线性度高,信噪比得到改善可达62dB。In near infrared spectroscopy for detection of industry systems, the useful information weak signal is often submerged in strong background noise. The lock-in amplifier could be used by weak signal detection technology to achieve the extraction of useful signal. Weak signal detection theory was described, and the outputs of the different reference signals were compared. A lock-in amplifier was designed using the AD630 as associated multiplier to extract the useful information in strong background noise. The test results indicated that the circuit structure was simple with high linearity of outputs, and the SNRI value was 62 dB.

关 键 词：锁相放大器 AD630 微弱信号 光谱检测 

分 类 号：TN911[电子电信—通信与信息系统]