Accession Number : ADA180622
Title : Measuring Atmospheric Extinction and Backscatter with a High Spectral Resolution Lidar.
Descriptive Note : Final rept. 1 May 84-30 Nov 86,
Corporate Author : WISCONSIN UNIV-MADISON DEPT OF METEOROLOGY
Personal Author(s) : Eloranta,Edwin W. ; Grund,Christian J.
Report Date : 25 APR 1987
Pagination or Media Count : 103
Abstract : The University of Wisconsin High Spectral Resolution Lindar (HSRL) is designed to make unambiguous, remote measurements of extinction cross sections and backscatter phase functions. This investigation was planned to observe the dependence of aerosol scattering properties on relative humidity. A series of observations were performed. These data showed the expected increase of scattering cross section with increases in relative humidity. In addition the measurements showed that the backscatter phase function appeared to be constant while the total scattering cross section varied. This was a puzzling result. Mean particle size in an aerosol haze should increase with relative humidity; Mie scattering calculations predict that the backscatter phase function is a function of the mean size. A careful analysis of the measurement confidence limits indicated that we could not eliminate calibration uncertainties were unacceptable. At this point we changed the focus of our effort from measurements to instrument improvements.
Descriptors : *AEROSOLS, *OPTICAL RADAR, *SCATTERING CROSS SECTIONS, BACKSCATTERING, CROSS SECTIONS, EXTINCTION, HIGH RESOLUTION, SPECTRA, MEAN, SIZES(DIMENSIONS), COMPUTATIONS, MIE SCATTERING, SCATTERING, CALIBRATION, PARTICLE SIZE, CONFIDENCE LIMITS, HUMIDITY, MEASUREMENT, REMOTE SYSTEMS, OBSERVATION
Subject Categories : Active & Passive Radar Detection & Equipment
Distribution Statement : APPROVED FOR PUBLIC RELEASE