Accession Number:

ADA055682

Title:

Relation of Infrared Doppler Lidar to Remote Wind Measurements in the Turbulent Atmosphere.

Descriptive Note:

Final rept. 1 Feb 76-31 Jan 78,

Corporate Author:

NATIONAL OCEANIC AND ATMOSPHERIC ADMINISTRATION BOULDER CO WAVE PROPAGATIONLAB

Personal Author(s):

Report Date:

1978-03-31

Pagination or Media Count:

12.0

Abstract:

The performance of a coherent Doppler lidar is affected by the atmosphere. Refractive index inhomogeneities limit the effective aperture of our system to 15.5 cm or - 4 on the average for a 2.6 km horizontal path 2 m above the surface under daytime conditions. Effective aperture scales as range to the -35 power. A differential Doppler technique can measure the wind vector in a single atmospheric volume with three or mor closely-spaced beams. This method works even when the distribution of velocities in the volume is wider than the velocity separation from beam angle differences. The structure function for backscatter and wind inhomogeneities scales approximately as r to the 23 power between the minimum detectable scale in our experiment and an outer scale of 100 to 500 m, depending on atmospheric condition. Author

Subject Categories:

  • Meteorology
  • Lasers and Masers

Distribution Statement:

APPROVED FOR PUBLIC RELEASE