标题：Probing greenhouse gases in turbulent atmosphere by long-range open-path wavelength modulation spectroscopy
作者：Xia, Jinbao; Zhu, Feng; Zhang, Sasa; Kolomenskii, Alexandre; Dong, Jian; Okada, Kunihiro; Strohaber, James; Schuessler, Hans A.
作者机构：[Xia, Jinbao; Zhu, Feng; Zhang, Sasa; Kolomenskii, Alexandre; Dong, Jian; Schuessler, Hans A.] Texas A&M Univ, Dept Phys & Astron, College Stn, TX 778 更多
通讯作者：Zhang, Sasa;Zhang, S;Kolomenskii, A;Zhang, S
通讯作者地址：[Zhang, S; Kolomenskii, A]Texas A&M Univ, Dept Phys & Astron, College Stn, TX 77843 USA;[Zhang, S]Shandong Univ, Sch Informat Sci & Engn, Anon 25006, 更多
来源：OPTICS AND LASERS IN ENGINEERING
关键词：Wavelength modulation spectroscopy; Long open-path detection; Greenhouse; gases monitoring
摘要：Open-path measurements of greenhouse gases yield valuable data for atmospheric research. We present such a method based on wavelength modulation spectroscopy to measure greenhouse gases. A movable platform was developed capable of detecting atmospheric variations of the concentrations of methane and carbon dioxide. The system was calibrated in the laboratory and then moved to the field for continuous automated measurements over paths of up to 2.6 km. The intensity modulation caused by turbulence was also measured. The continuous monitoring of methane was carried out for more than 30 h. Similar measurements of carbon dioxide were performed for about 10 h. The results show that the detection limits of methane and carbon dioxide are similar to 2 ppb and similar to 20 ppm with integration times of 60 s and 20 s, respectively. We conclude by discussing the achieved parameters in comparison to results obtained with other techniques, which shows that the developed sensor is a promising tool for monitoring of greenhouse gases.