摘要
在利用激光吸收光谱技术进行摩托车尾气检测的系统中,携带有用信息的光信号是微弱信号,淹没在很强的噪声和其他干扰的背景中,因此必须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。阐述了微弱信号检测的基本原理,比较了单通道和双通道的锁相放大器的优劣,设计了运用AD630作为相关乘法器的双相矢量锁相放大器。
In the use of laser absorption spectroscopy for detection of motorcycle exhaust systems, the useful information which optical signal carrying is weak. The weak signal is submerged in strong background noise and other interference. It must use the lock-in amplifier which belongs the weak signal detection technology to achieve the extraction of useful signal. This paper describes weak signal detection theory, and compares the pros and cons of the single-and dual-channel lock-in amplifier. Finally, designed a dual-phase lock-in amplifier using the AD630 as associated multiplier.
出处
《机电工程技术》
2012年第6期19-23,共5页
Mechanical & Electrical Engineering Technology
