光学
色散(光学)
光谱学
材料科学
甲烷
激光器
物理
化学
量子力学
有机化学
作者
Yifeng Chen,Michael G. Soskind,James McSpiritt,Jie Liu,Rui Wang,Nathan Li,Xuehui Guo,Mark A. Zondlo,Gerard Wysocki
出处
期刊:Optics Letters
[Optica Publishing Group]
日期:2021-05-24
卷期号:46 (13): 3005-3005
被引量:10
摘要
We report an open-path chirped laser dispersion spectrometer capable of detecting the atmospheric methane concentration above the background using both specular and diffusive reflective surfaces via two distinct operation modes in a stand-off detection configuration. The system is integrated with simultaneous ranging functionality, which enables average concentration measurements for varying optical pathlengths. The system was first tested for accuracy and characterized to achieve sensitivity of 2.9ppm-m/Hz1/2 and pathlength precision of 0.2m/Hz1/2 with a controlled release of methane outside the laboratory. The instrument was subsequently field-deployed in the proximity of a natural gas compressor station for fugitive methane detection. The instrument successfully detected methane plumes and narrowed down the location of the plume through multi-path measurement. The field measurements were verified by a co-located reference mobile methane sensor.
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