Date of Award

Spring 1994

Document Type

Thesis

Degree Name

Master of Science (MS)

Department

Electrical & Computer Engineering

Program/Concentration

Electrical Engineering

Committee Director

Amin N. Dharamsi

Committee Member

Karl H. Schoenbach

Committee Member

Hani Elsayed-Ali

Call Number for Print

Special Collections LD4331.E55J32

Abstract

Derivative Absorption Spectroscopy using tunable diode lasers provides a non­ intrusive, sensitive, and convenient method for monitoring gaseous characteristics such as concentration, temperature, and flow velocity. In addition, the specie type can be identified, and if the equation of state is known, pressure may be deduced.

This technique was used on molecular oxygen, in which the rovibronic transitions of the A-band ( b 1 ∑g + ← X 3 ∑g - ; vII = O, vI = O) were probed. Phase sensitive detection with a lock-in amplifier provides the flexibility to examine lineshape derivatives; several such derivative orders were examined.

The experimental results obtained show excellent agreement with theoretical considerations. The results yield concentration, temperature and collision cross-section.

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DOI

10.25777/s414-yw13

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