摘要
运用可调谐半导体激光吸收光谱(TDLAS)技术可以实现燃烧生成污染物的实时动态在线测量。该文给出了利用TDLAS技术进行测量的基本原理。通过建立CO2在6359.97cm?1处的吸收谱线模型,并结合HITRAN高精度迁移分子吸收数据库相关参数,讨论了激光扫描步长、温度、压强和光谱吸收率随机误差对于气体浓度测量的影响,并且分析了最小可探测浓度随温度、压强的变化情况。结论可为实际应用及进一步研究提供参考。
The technique based on tunable diode laser absorption spectroscopy （TDLAS） has been developed to realize the real-time and dynamic measurement of the combustion-generated pollutants. In this paper the fundamental of the measurement using TDLAS is presented. By setting up the mathematic model of CO2 absorption line at 6359.97cm^-1 andmaking use of the parameters from the high-resolution transmission molecular absorption database, the effects of scanning step length, temperature, pressure and absorbance random error on the gas concentration measurement are discussed. The minimum detectivity as a function of temperature and pressure is also analyzed. The result can be useful for the practical application and further study.
出处
《中国电机工程学报》
EI
CSCD
北大核心
2005年第15期121-126,共6页
Proceedings of the CSEE
关键词
半导体激光器
吸收谱线
线型函数
气体浓度测量
Diode laser
Absorption line
Lineshape function
Gas concentration measurement
