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Open AccessArticle

The Determination of Aerosol Distribution by a No-Blind-Zone Scanning Lidar

1
Key Laboratory of Environmental Optics and Technology, Anhui Institutes of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei 230031, China
2
Science Island Branch of Graduate School, University of Science and Technology of China, Hefei 230026, China
3
Department of Precision Machinery and Precision Instrumentation, University of Science and Technology of China, Hefei 230026, China
4
Institutes of Physical Science and Information Technology, Anhui University, Hefei 230601, China
5
China National Environmental Monitoring Centre, Beijing 100012, China
*
Author to whom correspondence should be addressed.
Remote Sens. 2020, 12(4), 626; https://doi.org/10.3390/rs12040626
Received: 1 January 2020 / Revised: 3 February 2020 / Accepted: 11 February 2020 / Published: 13 February 2020
A homemade portable no-blind zone laser detection and ranging (lidar) system was designed to map the three-dimensional (3D) distribution of aerosols based on a dual-field-of-view (FOV) receiver system. This innovative lidar prototype has a space resolution of 7.5 m and a time resolution of 30 s. A blind zone of zero meters, and a transition zone of approximately 60 m were realized with careful optical alignments, and were rather meaningful to the lower atmosphere observation. With a scanning platform, the lidar system was used to locate the industrial pollution sources at ground level. The primary parameters of the transmitter, receivers, and detectors are described in this paper. Acquiring a whole return signal of this lidar system represents the key step to the retrieval of aerosol distribution with applying a linear joining method to the two FOV signals. The vertical profiles of aerosols were retrieved by the traditional Fernald method and verified by real-time observations. To effectively and reliably retrieve the horizontal distributions of aerosols, a composition of the Fernald method and the slope method were applied. In this way, a priori assumptions of even atmospheric conditions and the already-known reference point in the lidar equation were avoided. No-blind-zone vertical in-situ observation of aerosol illustrated a detailed evolution from almost 0 m to higher altitudes. No-blind-zone detection provided tiny structures of pollution distribution in lower atmosphere, which is closely related to human health. Horizontal field scanning experiments were also conducted in the Shandong Province. The results showed a high accuracy of aerosol mass movement by this lidar system. An effective quantitative way to locate pollution sources distribution was paved with the portable lidar system after validation by the mass concentration of suspended particulate matter from a ground air quality station. View Full-Text
Keywords: lidar; dual-field-of-view (FOV); geometric overlap factor (GOF); blind zone; transition zone; aerosol; mass concentration; stereo-monitoring networks lidar; dual-field-of-view (FOV); geometric overlap factor (GOF); blind zone; transition zone; aerosol; mass concentration; stereo-monitoring networks
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Wang, J.; Liu, W.; Liu, C.; Zhang, T.; Liu, J.; Chen, Z.; Xiang, Y.; Meng, X. The Determination of Aerosol Distribution by a No-Blind-Zone Scanning Lidar. Remote Sens. 2020, 12, 626.

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