Date of Award

Spring 1996

Document Type

Thesis

Degree Name

Master of Science (MS)

Department

Electrical & Computer Engineering

Program/Concentration

Electrical Engineering

Committee Director

A. N. Dharamsi

Committee Director

R. P. Joshi

Committee Member

H. Elsayed-Ali

Call Number for Print

Special Collections LD4331.E55 L82

Abstract

Wavelength Modulation Spectroscopy is a non-intrusive technique which enables several parameters such as concentration, velocity, and temperature of a target specie to be measured. The method involves a modulation of a probe laser beam and detection at the fundamental, or any harmonic frequency, by a phase-sensitive apparatus. The theory of wavelength modulation is discussed. Effects of the finite value of the wavelength modulation index, together with the effects of any residual amplitude modulation that often occurs simultaneously in a diode laser, are included. It is shown that there are several advantages in using detection harmonics orders greater than the second. These include an increased resolution of nearly overlapping lines, as well as an increased sensitivity to density fluctuations. Experimental results are presented and compared to the theory developed.

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DOI

10.25777/hhyx-tt62

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