Date of Publication

12-2003

Document Type

Master's Thesis

Degree Name

Master of Science in Physics

Subject Categories

Physics

College

College of Science

Department/Unit

Physics

Thesis Adviser

Nobuo Takeuchi
Maria Cecilia D. Galvez

Defense Panel Chair

Emmanuel T. Rodulfo

Defense Panel Member

Wilson Garcia
Gil Nonato C. Santos

Abstract/Summary

Some meteorological parameters obtained by a compact Mie Lidar system called Portable Automated Lidar (PAL) is presented in this study. The eye-safe system operating at 532nm showed capability for long term unaided measurements of atmospheric phenomena in the lower troposphere. The system (35'31'N, 140'04'E) is remotely controlled and accessed via the internet. Software was developed to determine the boundary layer height, cloud base height, extinction coefficient and derivation of rain drop size during precipitation in the Lidar data. The boundary layer height was derived using the Normalized Concentration Gradient and the cloud base height was determined by the slope method. Boundary layer heights were observed at an altitude of about 1km above the ground. Fernald's inversion method was used in deriving the extinction coefficient, and together with the range squared corrected Lidar signal, both were related to ground based B-ray SPM (Suspended Particulate Matter) dust counter for comparison. An average factor of 0.0055 relates the SPM concentration to the derived extinction coefficient. A good consistency was found in the Lidar vs. SPM comparison which makes the PAL a suitable tool for tropospheric monitoring. Rain drop size determination also showed consistency with ground base precipitation measurements.

Abstract Format

html

Language

English

Format

Electronic

Accession Number

CDTG003579

Shelf Location

Archives, The Learning Commons, 12F Henry Sy Sr. Hall

Physical Description

1 computer optical disc ; 4 3/4 in.

Keywords

Atmospheric pressure--Measurement; Optical radar; Laser communication systems

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