基于红外激光光谱的H_2S气体传感器的二次谐波理论分析  

Second Harmonic Theoretical Analysis of H_2S Gas Sensor Based on Infrared Laser Spectroscopy

作　　者：张显杰[1] 余震虹[1] 

机构地区：[1]江南大学物联网工程学院,江苏无锡214122

出　　处：《仪表技术与传感器》2015年第4期11-12,41,共3页Instrument Technique and Sensor

摘　　要：为确定合适的调制度,更好地抑止噪声、提高信噪比,从而提高检测灵敏度及精度,采取以硫化氢气体的中心波数v=6 637 cm-1的振-转吸收谱线为目标,建立了洛伦兹线型的二次谐波信号数值模型。通过改变调制度m的大小,得到相应洛伦兹线型的二次谐波信号谱线,并分析了调制度对谐波信号幅值、峰宽的具体影响,为实际TDLAS二次谐波测量系统的设计与分析提供参考。To determine the appropriate modulation, better suppress the noise and improve the signal to noise ratio thus impro- ving the detection sensitivity and accuracy, the Lorentzian linear numerical model of second harmonic signal was established by tak- ing the vibrational -rotational absorption lines of 6 337 cm^-1 center wavenumber HES gas as the target.By changing the size of m to give the corresponding secondary Lorentzian linear harmonic signal line ,the paper analyzed the specific impact of modulation to the amplitude, peak and width of the harmonic modulation signal, which provided a good reference for the design and analysis of actual TDLAS second harmonic measurement system.

关 键 词：调制度 洛伦兹线型 二次谐波 硫化氢 

分 类 号：O433.3[机械工程—光学工程]