基于数字锁相放大技术的强噪声背景下检测微弱信号教学实验

摘要

After introducing the theory of extracting weak signal from strong noise background , this article presented a teaching equipment which worked with LIA in weak signal detection under strong noise background and expounded the experimental principle .The experimental results obtained with this equipment and LIA OE1022 verified the performance of this equipment .It was commendably suitable for the application in real teaching area .%介绍了锁相放大技术在噪声背景下检测微弱交流信号的原理，研制出结合锁相放大器使用的微弱信号检测教学设备及其实验系统。利用OE1022型锁相放大器进行噪声中微弱交流信号测量实验，验证该系统功能。实验结果表明：使用该实验系统可以准确检测淹没在有效值比自身高104的白噪声中的微伏级交流信号。