Broadband continuous-wave differential absorption lidar for atmospheric remote sensing of water vapor
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Published:2024-01-16
Issue:3
Volume:32
Page:3046
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ISSN:1094-4087
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Container-title:Optics Express
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language:en
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Short-container-title:Opt. Express
Author:
Yu Jiheng,Cheng Yuan,Kong Zheng,Song Jiaming,Chang Yupeng,Liu Kun,Gong Zhenfeng,Mei Liang
Abstract
What we believe to be a novel low-cost broadband continuous-wave water vapor differential absorption lidar (CW-DIAL) technique has been proposed and implemented by combing the Scheimpflug principle and the differential absorption method. The broadband CW-DIAL technique utilizes an 830-nm high-power multimode laser diode with 3-W output power as a tunable light source and a CMOS image sensor tilted at 45° as the detector. A retrieval algorithm dedicated for the broadband CW-DIAL technique has been developed to obtain range-resolved water vapor concentration from the DIAL signal. Atmospheric remote sensing of water vapor has been carried out on a near-horizontal water vapor path to validate the performance of the broadband CW-DIAL system. The retrieved water vapor concentration showed a good consistency with those measured by an air quality monitoring station, with a correlation coefficient of 0.9669. The fitting error of the water vapor concentration is found to be less than 10%. Numerical simulation studies have revealed that the aerosol-induced error on the water vapor concentration is below 5% with a background water vapor concentration of 5 g/m3 for most atmospheric conditions. The experimental results have successfully demonstrated the feasibility of the present broadband CW-DIAL technique for range-resolved water vapor remote sensing.
Funder
National Natural Science Foundation of China
Fundamental Research Funds for the Central Universities
Publisher
Optica Publishing Group
Subject
Atomic and Molecular Physics, and Optics