Abstract
Lidar technique is the most performing way to obtain the atmospheric vertical profile of aerosol optical properties with high space-time resolution. With elastic scattering lidars, the retrieval of aerosol optical properties (as the extinction profile) is realizable only with assumptions on aerosol extinction-to-backscatter ratio or with Raman measurement achievable in night-time. In order to overcome these problems, the High Spectral Resolution Lidar (HSRL) technique has been examined. In this paper we present an innovative prototype of High Spectral Resolution Lidar realized at Physics Department of University “Federico II” of Naples for the LISA (LIdar for Space study of the Atmosphere) project in the framework of the China-Italy international cooperation between CNISM and BRIT. The prototype which represents a first step of a spaceborne HSRL, is based on a laser source at 1064nm and 532nm with high spectral resolution ability at 532nm. The separation between the molecular and the aerosol components was obtained through the use of a confocal Fabry-Perot interferometer (CFPI) cavity.
Highlights
Aerosol particles are among the main constituents of the atmosphere
In this paper we present an innovative prototype of High Spectral Resolution Lidar realized at Physics Department of University “Federico II” of Naples for the LISA (LIdar for Space study of the Atmosphere) project in the framework of the China-Italy international cooperation between CNISM and Beijing Research Institute of Telemetry (BRIT)
The prototype which represents a first step of a spaceborne High Spectral Resolution Lidar (HSRL), is based on a laser source at 1064nm and 532nm with high spectral resolution ability at 532nm
Summary
Aerosol particles are among the main constituents of the atmosphere. They are the principal responsible for the uncertainties in the knowledge of the atmospheric processes and of the Earth radiation balance. HSRL as the Raman one, returns a direct knowledge on the α and β coefficient but without limitations to night time measurements This can be reached by using the different Doppler broadening of scattering between aerosol particles (Mie scattering) and Rayleigh scattering from molecules. The confocal Fabry–Perot interferometer (CFPI) is the narrow-band optical filter which has been selected in order to separate the two components of the backscattering light It transmits the selected wavelength from aerosol scattering and reflects the molecular contribution. The cavity is kept tuned to the fundamental frequency of the laser source In this condition it acts as a very narrow spectral filter even at the frequency of the second harmonic. This realization of the frequency locking system required the study of cavity dispersion phenomena at two wavelengths. The horizontal and vertical resolution are 50 km and 1 km respectively
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