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

科研成果: 书/报告/会议事项章节会议稿件同行评审

摘要

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.

源语言英语
主期刊名Pacific-Rim Laser Damage 2019
主期刊副标题Optical Materials for High-Power Lasers
编辑Jianda Shao, Takahisa Jitsuno, Wolfgang Rudolph
出版商SPIE
ISBN(电子版)9781510628168
DOI
出版状态已出版 - 2019
活动Pacific-Rim Laser Damage 2019: Optical Materials for High-Power Lasers - Qingdao, 中国
期限: 19 5月 201922 5月 2019

出版系列

姓名Proceedings of SPIE - The International Society for Optical Engineering
11063
ISSN(印刷版)0277-786X
ISSN(电子版)1996-756X

会议

会议Pacific-Rim Laser Damage 2019: Optical Materials for High-Power Lasers
国家/地区中国
Qingdao
时期19/05/1922/05/19

指纹

探究 'A new method for air quality observation based on ultraviolet laser' 的科研主题。它们共同构成独一无二的指纹。

引用此