Study of Airborne Particulate Matter Using Multiwavelength Raman Lidar
Document ID: 179
Li, Guangkun
Philbrick, C. Russell
The Pennsylvania State University, Department of Electrical Engineering, University Park, PA, U.S.A.
Presented: 22nd International Laser Radar Conference (ILRC 2004)
Matera, Italy, 12-16 July 2004
Abstract
The Raman lidar system of Penn State University has a distinct advantage in measuring the optical extinction profiles at several different wavelengths simultaneously. The ratios of aerosol extinction profiles at different wavelengths are examined and model calculations are compared with the measurements. Model simulations show that the ratio of extinction is size dependent for accumulation mode particles; while for the larger size particles referred as coarse mode particles, the ratio is size independent and approaches unity. When an aerosol cloud layer is present in the laser path of Raman lidar, the analysis of the ratio of the extinction coefficient at different wavelengths can be used to describe the variations of aerosol size in the cloud layer. The extinction measurements at multiple wavelengths show unique information about particle characteristics, which cannot been obtained from the single wavelength profiles.
| Citation: | "Study of Airborne Particulate Matter Using Multiwavelength Raman Lidar", Li, G., C. R. Philbrick, ILRC, European Space Agency (ESA), 2004, pp. 377 - 380 |