Analysis and demonstration of atmospheric methane monitoring by mid-infrared open-path chirped laser dispersion spectroscopy

被引：27

作者：

Daghestani, Nart S. ^{[1
]}

Brownsword, Richard ^{[1
]}

Weidmann, Damien ^{[1
]}

机构：

[1] Rutherford Appleton Lab, Space Sci & Technol Dept, Didcot OX11 0QX, Oxon, England

来源：

OPTICS EXPRESS | 2014年 / 22卷 / 25期

关键词：

EMISSIONS;

D O I：

10.1364/OE.22.0A1731

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

Atmospheric methane concentration levels were detected using a custom built laser dispersion spectrometer in a long open-path beam configuration. The instrument is driven by a chirped distributed feedback mid-infrared quantum cascade laser centered at similar to 1283.46 cm(-1) and covers intense rotational-vibrational transitions from the fundamental nu(4) band of methane. A full forward model simulating molecular absorption and dispersion profiles, as well as instrumental noise, is demonstrated. The instrument's analytical model is validated and used for quantitative instrumental optimization. The temporal evolution of atmospheric methane mixing ratios is retrieved using a fitting algorithm based on the model. Full error propagation analysis on precision gives a normalized sensitivity of similar to 3 ppm. m. Hz(-0.5) for atmospheric methane. (C)2014 Optical Society of America

引用

页码：A1731 / A1743

页数：13

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