A new method for air quality observation based on ultraviolet laser

Siying Chen; Baowei Li; He Chen; Yinchao Zhang; Pan Guo; Xunbao Rui; Ting Li

doi:10.1117/12.2539999

8 July 2019 A new method for air quality observation based on ultraviolet laser

Siying Chen, Baowei Li, He Chen, Yinchao Zhang, Pan Guo, Xunbao Rui, Ting Li

Proceedings Volume 11063, Pacific Rim Laser Damage 2019: Optical Materials for High-Power Lasers; 110630L (2019) https://doi.org/10.1117/12.2539999
Event: Pacific Rim Laser Damage 2019 and Thin Film Physics and Applications 2019, 2019, Qingdao, China

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.

Citation Download Citation

Siying Chen, Baowei Li, He Chen, Yinchao Zhang, Pan Guo, Xunbao Rui, and Ting Li "A new method for air quality observation based on ultraviolet laser", Proc. SPIE 11063, Pacific Rim Laser Damage 2019: Optical Materials for High-Power Lasers, 110630L (8 July 2019); https://doi.org/10.1117/12.2539999

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KEYWORDS

Aerosols

LIDAR

Ultraviolet radiation

Atmospheric particles

Laser induced fluorescence

Luminescence

Mass attenuation coefficient

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