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Proceedings Paper

A new method for air quality observation based on ultraviolet laser
Author(s): Siying Chen; Baowei Li; He Chen; Yinchao Zhang; Pan Guo; Xunbao Rui; Ting Li
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Paper Abstract

A lidar based on UV laser is developed to observe air quality in Beijing. The initial laser wavelength is 1064 nm, and an emission wavelength of 355 nm is obtained after the second-harmonic generation and third-harmonic generation. The output energy is 30 mJ/pulse, and the pulse width is 7 ns. Echo signals are collected by a 304.8 mm diameter Newtonian telescope. With high-power ultraviolet laser excitation, the intensity of atmospheric pollutants is studied by the laserinduced fluorescence (LIF). The Mie scattering is detected simultaneously and both signals are detected by the photomultiplier tubes (PMT). The system is calibrated by a series of experiments. The aerosol extinction coefficient retrieved by Mie signal from this system agrees well with that from another lidar with a laser wavelength of 532 nm. The fluorescence efficiency of atmospheric pollutants are obtained by calculating the fluorescence-to-Mie ratio (FMR). The time and spatial resolution of the system are 5 s and 7.5 m, respectively. The continuous change of air quality over a period of time is studied by the mean value of FMR. Many observations are carried out under different air quality conditions, and the experimental results are in good agreement with the results of the ground observation station. In summary, this method based on UV laser is feasible in the field of atmospheric remote sensing and have potential applications in the field of air quality monitoring.

Paper Details

Date Published: 8 July 2019
PDF: 7 pages
Proc. SPIE 11063, Pacific Rim Laser Damage 2019: Optical Materials for High-Power Lasers, 110630L (8 July 2019); doi: 10.1117/12.2539999
Show Author Affiliations
Siying Chen, Beijing Institute of Technology (China)
Baowei Li, Beijing Institute of Technology (China)
He Chen, Beijing Institute of Technology (China)
Yinchao Zhang, Beijing Institute of Technology (China)
Pan Guo, Beijing Institute of Technology (China)
Xunbao Rui, Beijing Institute of Technology (China)
Ting Li, Beijing Institute of Technology (China)

Published in SPIE Proceedings Vol. 11063:
Pacific Rim Laser Damage 2019: Optical Materials for High-Power Lasers
Jianda Shao; Takahisa Jitsuno; Wolfgang Rudolph, Editor(s)

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