Accession Number:

ADA160899

Title:

Lidar Multiple Scattering/Depolarization in Stratus Clouds.

Descriptive Note:

Master's thesis,

Corporate Author:

AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH

Personal Author(s):

Report Date:

1985-01-01

Pagination or Media Count:

77.0

Abstract:

The contributions of multiple scattering to backscattered depolarization ratios in stratus clouds were investigated using a linearly-polarized ruby lidar system from a site on the southern Californis coast. The effects of the receiver field of view, lidar elevation angle, the transmitterreceiver beam misalignment on depolarization ratios were investigated. Results for a 1 mrad transmitter beam width indicate that a receiver field of view of 3 mrad returns an almost threefold increase in backscattered depolarization ratios as opposed to a 1 mrad field of view. The effects caused by changing the elevation angle appear to be related to the cloud base. Deliberate beam alignment produces significant alterations in the lidar returns, demonstrating the importance of maintaining proper alignment. In the future, the lidar should be used in conjunction with in situ microphysical observations and a program of theoretical studies to assess the degree to which the lidar data can be related to specific stratus cloud properties. Author

Subject Categories:

  • Meteorology
  • Lasers and Masers
  • Active and Passive Radar Detection and Equipment

Distribution Statement:

APPROVED FOR PUBLIC RELEASE