Accession Number : ADA299428

Title :   Edge Technique Lidar for High Accuracy, High Spatial Resolution Wind Measurement in the Planetary Boundary Layer.

Descriptive Note : Final rept.,

Corporate Author : NATIONAL AERONAUTICS AND SPACE ADMINISTRATION GREENBELT MD GODDARD SPACE FLIG HT CENTER

Personal Author(s) : Korb, C. L. ; Gentry, Bruce M.

PDF Url : ADA299428

Report Date : 01 JUL 1995

Pagination or Media Count : 29

Abstract : The goal of the Army Research Office Geosciences program is to measure the three dimensional wind field in the planetary boundary layer (PBL) over a measurement volume with a 5O meter spatial resolution and with measurement accuracies of the order of 20 cm/sec. The objective of this work is to develop and evaluate a high vertical resolution lidar experiment using the edge technique for high accuracy measurement of the atmospheric wind field to meet the ARO requirements. This experiment allows the powerful capabilities of the edge technique to be quantitatively evaluated. In the edge technique, a laser is located on the steep slope of a high resolution spectral filter. This produces large changes in measured signal for small Doppler shifts. A differential frequency technique renders the Doppler shift measurement insensitive to both laser and filter frequency jitter and drift. The measurement is also relatively insensitive to the laser spectral width for widths less than the width of the edge filter. Thus, the goal is to develop a system which will yield a substantial improvement in the state of the art of wind profile measurement in terms of both vertical resolution and accuracy and will provide a unique capability for atmospheric wind studies.

Descriptors :   *OPTICAL RADAR, *PLANETARY ATMOSPHERES, MEASUREMENT, HIGH RATE, EDGES, RESOLUTION, WIND, HIGH RESOLUTION, THREE DIMENSIONAL, DRIFT, MATHEMATICAL FILTERS, PROFILES, VERTICAL ORIENTATION, SLOPE, DOPPLER EFFECT, JITTER.

Subject Categories : Meteorology
      Infrared Detection and Detectors

Distribution Statement : APPROVED FOR PUBLIC RELEASE