Date of Award

Spring 2002

Document Type

Thesis

Degree Name

Master of Science (MS)

Department

Electrical & Computer Engineering

Program/Concentration

Electrical Engineering

Committee Director

Amin N. Dharamsi

Committee Member

Ravindra P. Joshi

Committee Member

Karl H. Schoenbach

Call Number for Print

Special Collections LD4331.E55 B375 2002

Abstract

Experiments in Wavelength Modulation Spectroscopy have been conducted at Old Dominion University since 1996. The method provides a highly sensitive, nonintrusive method of probing gases. Research has concentrated on effectively modeling the higher harmonic shapes that are measured experimentally. Accurately modeling these signals will result in the ability to reliably extract the information contained in transition line shapes.

In order to accurately depict the signals, the theory must be thoroughly understood. This thesis develops the theory of Wavelength Modulation Spectroscopy from two aspects: a direct Fourier series expansion of a time varying intensity profile and through communication theory. In addition, a method of ratioing higher harmonics is introduced. This method reduces the subjectivity in modeling and will eventually lead to future automation.

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DOI

10.25777/wmqs-5h59

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