Lasers, Fiber Optics, and Communications

Research on atmospheric CO2 remote sensing with open-path tunable diode laser absorption spectroscopy and comparison methods

[+] Author Affiliations
Fengxin Xin, Jinjia Guo, Jie Li, Chaofang Zhao, Zhishen Liu

Ocean University of China, Ocean Remote Sensing Institute, Qingdao, China

Jiayun Sun

Shandong University of Science and Technology, College of Geomatics, Qingdao, China

Opt. Eng. 56(6), 066113 (Jun 22, 2017). doi:10.1117/1.OE.56.6.066113
History: Received March 7, 2017; Accepted May 31, 2017
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Abstract.  An open-path atmospheric CO2 measurement system was built based on tunable diode laser absorption spectroscopy (TDLAS). The CO2 absorption line near 2  μm was selected, measuring the atmospheric CO2 with direct absorption spectroscopy and carrying on the comparative experiment with multipoint measuring instruments of the open-path. The detection limit of the TDLAS system is 1.94×106. The calibration experiment of three AZ-7752 handheld CO2 measuring instruments was carried out with the Los Gatos Research gas analyzer. The consistency of the results was good, and the handheld instrument could be used in the TDLAS system after numerical calibration. With the contrast of three AZ-7752 and their averages, the correlation coefficients are 0.8828, 0.9004, 0.9079, and 0.9393 respectively, which shows that the open-path TDLAS has the best correlation with the average of three AZ-7752 and measures the concentration of atmospheric CO2 accurately. Multipoint measurement provides a convenient comparative method for open-path TDLAS.

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© 2017 Society of Photo-Optical Instrumentation Engineers

Citation

Fengxin Xin ; Jinjia Guo ; Jiayun Sun ; Jie Li ; Chaofang Zhao, et al.
"Research on atmospheric CO2 remote sensing with open-path tunable diode laser absorption spectroscopy and comparison methods", Opt. Eng. 56(6), 066113 (Jun 22, 2017). ; http://dx.doi.org/10.1117/1.OE.56.6.066113


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