锁相放大技术在光学式甲烷气体传感器中的应用  

Application of Lock-in Amplifier in Optical Methane Gas Sensor

作　　者：王琢[1,2] 曹家年[1] 冯琳琳[1] 

机构地区：[1]哈尔滨工程大学信息与通信工程学院,黑龙江哈尔滨150001 [2]东北林业大学机电工程学院,黑龙江哈尔滨150040

出　　处：《工业控制计算机》2010年第9期112-113,115,共3页Industrial Control Computer

摘　　要：设计了一种基于近红外可调谐半导体激光吸收光谱的光学式甲烷气体传感器,传感器针对甲烷气体位于1653.722nm处的吸收谱线,应用锁相放大技术提取微弱的一次谐波幅度信号,实现对气体浓度的测量。重点分析了在光学式甲烷气体传感器中应用锁相放大的原理及关键技术。结果表明该传感器响应时间为10s,测量精度可达0.02%VOL。An optical methane gas sensor based on near infrared tunable diode laser absorption spectroscopy is designed,and the first harmonic amplitude signal of methane gas absorption spectroscopy at 1654nm is extracted by using lock-in amplifier, then the gas concentration is measured.The theory and key technology of lock-in amplifier used in optical methane gas sen-sor are analyzed,and the results show the response time and the precision of this kind of sensor are 10s and 0.02%VOL.

关 键 词：传感器 甲烷 光学 锁相放大 

分 类 号：TP212.2[自动化与计算机技术—检测技术与自动化装置]