Date of Publication

2004

Document Type

Master's Thesis

Degree Name

Master of Science in Physics

Subject Categories

Physics

College

College of Science

Department/Unit

Physics

Thesis Adviser

Edgar A. Vallar

Defense Panel Chair

Gil Nonato C. Santos

Defense Panel Member

Wilson O. Garcia
Maria Carla F. Manzano

Abstract/Summary

Eleven Aerosol Size Distributions (ASD) (from Urban to Maritime with 9 logarithmic increments in between them) was simulated in this study to generate a Lookup Table (LUT). In the simulations, aerosol size ranged from 0.001-10μm with 1.40 to 1.60 real and 0.000-0.030 imaginary refractive indices for 355-, 532-, 368- and 862-nm wavelengths. The 355- and 532-nm wavelengths are used in the LiDAR while the 368- and 862-nm wavelengths are for the SunPhotometer. The Signal-to-Noise Ratio (SNR) and correlation coefficient squared were computed for the LiDAR signal at 355- and 532- nm denoised using the Haar, Daubechies, Coifman, Symlet, and Beylkin wavelet bases. After testing 2,715 files, it was seen that the Haar wavelet was the best wavelet in denoising the LiDAR signal since it gave the highest SNR and correlation coefficient squared. The extinction coefficients calculated using Fernalds inversion method used LiDAR data denoised using the Haar wavelet. The ASD in the De La Salle University area was determined by comparing the ratio of extinction coefficients to values found in the LUT. The ASD of the data analyzed falls on the two extreme ASD models considered. Results have also shown that the ASD, and consequently the type of aerosols interacting with the LiDAR, is affected by the local meteorological conditions and mans activities (e.g., fireworks during New Years eve).

Abstract Format

html

Language

English

Format

Electronic

Accession Number

CDTG003816

Shelf Location

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

Physical Description

1 computer optical disc ; 4 3/4 in.

Keywords

Wavelets (Mathematics); Optical radar; Harmonic analysis; Particle size determination; Aerosols--Measurement

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