CO{sub}2 laser based mobile dial system for atmospheric pollutants monitoring

摘要

There are different techniques of remote sensing, with the dial has been obtaining good results to achieve concentration profiles of several pollutants. In fact, it allows to evaluate the remote concentration of atmospheric constituents. hiparticular a good tools for this purpose are the dial systems based on CO{sub}2 laser which can be used routinely having an high degrees of eye safety. At the Department of Physics of the University' of Calabria a lidar-dial land system has been developed and on the basic of that we have realised a prototype of a mobile station. In the system there are mounted two home-made twin TEA CO{sub}2 lasers in SFUR configurations. The receiving system is based of a cassegrain telescope with 40 cm of diameter thatacquire the backscattered signal and on the focal plane is located a cooled HgCdTe detector. The signal is acquired by VXI system and stored in a memory of a personal computer. The laser pulse is transmitted and received by a scanner module The system ismounted in a container which can be transported. At the aim to test the fixed station was done measurements on an horizontal path to span with the laser beam over both a large urban area and a rural one. Work is in progress to improve the mobile dialsystem in order to have better performances and to achieve atmospheric profiles of compounds of environmental interest.