摘要
为了提高气体差分传感系统的信噪比,基于微弱信号的相关检测原理,设计了以锁相放大器为核心的微弱信号处理电路。实验表明:电路输出电压与检测气体体积分数呈线性关系,电路对气体体积分数的检测极限为150×10-6,检测系统对检测气体体积分数的误差为1%,具有较好的重复性及选择性。
In order to improve signal to noise ratio（SNR） of the differential absorption gas sensor system, based on the correlation detection principle, a faint signal processing circuit is designed centering around lock-in amplifier. Experimental results indicate that the output voltage of detective circuit is linear with the gas volume fraction ,the limit value is 150 × 10^-6. The error of the whole detection system to the gas volume fraction is 1% , the repeatability and selectivity of the system is better.
出处
《传感器与微系统》
CSCD
北大核心
2006年第6期13-15,共3页
Transducer and Microsystem Technologies
基金
河北省博士基金资助项目(03547020D)
黑龙江省自然科学基金资助项目(F0312)
关键词
锁相放大器
微弱信号
相关检测
信噪比
lock-in amplifier
faint signal
correlation detection
signal to noise ratio（SNR）
