Abstract
A portable unmanned Mie-scattering Scheimpflug lidar system has been designed and implemented for atmospheric remote sensing. The Scheimpflug lidar system employs a continuous-wave high-power 808 nm laser diode as the light source and the emitted laser beam is collimated by an F6 lens with a 100 mm aperture. Atmospheric backscattering light is collected by a F5 lens with a 150 mm aperture and then detected by a 45° tilted image sensor. The separation between the transmitting and the receiving optics is about 756 mm to satisfy the Scheimpflug principle. Unmanned outdoor atmospheric measurements were performed in an urban area to investigate system performance. Localized emissions can be identified by performing horizontal scanning measurements over the urban atmosphere for 107° approximately every 17 min. The temporal variation of the vertical aerosol structure in the boundary layer has also been studied through zenith scanning measurements. The promising result shows great potential of the present portable lidar system for unmanned atmospheric pollution monitoring in urban areas.
Highlights
During recent decades, the increasing demand for atmospheric aerosol data has promoted the rapid development of atmospheric lidar techniques
We report on the development of a portable unmanned Mie-scattering Scheimpflug lidar system based on custom-designed optical architecture and optomechanics, and investigate its feasibility for pollution source tracking as well as vertical aerosol layer structure studies
The SLidar system is fulfilled by integrating custom designed optomechanics and optoelectronics; 360 ̊ panoramic horizontal scanning and 0 ̊–36 ̊ vertical scanning are feasible through a large-load rotation stage
Summary
The increasing demand for atmospheric aerosol data has promoted the rapid development of atmospheric lidar techniques Atmospheric parameters such as aerosol extinction, optical depth, cloud height, boundary layer, microphysical aerosol parameters, etc., can be qualitatively or quantitatively studied by various lidar techniques such as Raman lidar [1,2,3,4], high spectral resolution lidar [5,6] and Mie-scattering lidar [7,8,9,10,11,12]. We report on the development of a portable unmanned Mie-scattering Scheimpflug lidar system based on custom-designed optical architecture and optomechanics, and investigate its feasibility for pollution source tracking as well as vertical aerosol layer structure studies. Atmospheric horizontal and zenith scanning measurements have been performed for preliminary studies on urban pollution source tracking and vertical aerosol structure
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