锁定放大器在检测微弱信号中的应用  

The Application of Lock-in Amplifier in the Detection of Weak Signals

作　　者：杨建新[1] 武银兰[1] 

机构地区：[1]太原理工大学应用物理系

出　　处：《物理通报》2012年第9期80-82,共3页Physics Bulletin

摘　　要：对锁定放大器的功能原理进行了介绍，并用锁定放大器对微弱信号及加了不同噪声的微弱信号分别进行了测试，实验证明锁定放大器具有良好的检测微弱信号的功能．The actual measurement is always accompanied by the unwanted noise and interference. It affects the measurement accuracy and sensitivity, especially when the noise power is bigger than the signal power. That needs to use weak signal detection apparatus and equipment to recover or detect the original signal. The famous intrument of weak signals is lock--in amplifier（LIA）. This paper introduced the priciple of IdA,than weak signals and those signals added different noise were tested. It proved that LIA has a good function in the dection of weak signals.

关 键 词：锁定放大器 相关器 微弱信号 信号通道 参考通道 

分 类 号：TN722[电子电信—电路与系统]