Date of Award

Spring 1997

Document Type

Thesis

Program/Concentration

Electrical Engineering

Committee Director

Amin N. Dharamsi

Committee Member

Ravindra P. Joshi

Committee Member

Linda L. Vahala

Call Number for Print

Special Collections LD4331.E55 B846

Abstract

Wavelength modulation spectroscopy is a highly sensitive, non-intrusive technique for probing gaseous species. Parameters such as velocity, density, and temperature can be measured and monitored with a high degree of precision. In addition, with the use of this technique multiple molecular species may be identified with a single laser probe. This measurement technique utilizes the well-known principles of modulation absorption spectroscopy in a novel way.

The research focuses on harmonic detection and the advantages gained by performing detection at higher harmonics, those greater than the commonly used second harmonic. We show that there is an increase in the sensitivity to density fluctuations, as well as increased wavelength resolution of congested spectra with higher harmonic detection. Other general characteristics of signals obtained by employing wavelength modulation spectroscopy with harmonic detection are discussed along with corresponding applications.

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DOI

10.25777/8xnp-ha91

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