Quantitative characterization of atmospheric desert particles by multispectral LIDAR method (UV to IR), by using genetic algorithms

 

S. Zeghbib1, S. Bouzid2*, A. Chaabi1  

1 University of Constantine, Faculty of Engineering, Institute of Electronic, Semiconductor and Ultra high frequency Laboratory,

Constantine 25000 Algeria

2University of  Constantine, Faculty of Medicine, Laboratory o f  Lasers and Applications, PB 125, Chalet des pins,

 Constantine 25000, Algeria

* Corresponding author. E-mail:samia.bouzid@gmail.com

Received: 05 April 2008; revised version accepted: 24 February 2009

 

Abstract

     The aerosols are an important component of urban pollution and physico-chemistry of the atmosphere. It is essential to dispose cartographies three dimensions of their concentration by LIDAR (Light Detection And Ranging) method. The interest of optic measurements of LIDAR teledetection is to give a direct access to the repartition of limited layers and to the optical extinction of atmospheric particles. The characterization of micro-physical properties of aerosols (size, concentration) had therefore less easy, because size distribution of aerosols interferes in an integral form with in a certain extent of the optical extinction by physical properties of the measurement. Therefore, this has been realized in the case of less complex atmospheres (desert particles, acids, silica, fog, cloud). We will discover, throughout this work a representation of the size distribution of the desert aerosols by multispectral LIDAR, by using a Laser source going from UV to mean IR. Measurements of concentrations thus will be possible without any presentation of distribution contrary to other methods such as LIDAR (taking by impaction).

Keywords:  Desert aerosols; LIDAR, LIDAR   (taking by impaction) ; Mie theory; Klett inversion; Longtin and  desert model.

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