Biedrzycki, Stephen
(2012)
ADVANCED TECHNIQUES FOR GAS-PHASE RAMAN SPECTROSCOPY.
Master's Thesis, University of Pittsburgh.
(Unpublished)
Abstract
The small cross-sections associated with Raman scattering generally hinders the application of Raman spectroscopy to low density gas analysis. The focus of this work is the development of tools and techniques to enhance collection of Raman-scattered light from gaseous samples contained in hollow-core waveguides. The developments are motivated by a need for accurate, real-time composition analysis of natural gas for clean and efficient turbine operation. Methods to increase the Raman signal and to reduce system noise sources are explored. Silver-coated silica waveguides currently used are covered with a highly fluorescent protective plastic coating which is responsible for most of the system noise. One noise reduction method explored is the replacement of these guides by polished, pure or sterling silver tubes. Work directed toward increasing Raman signals began with an analysis of the modal properties of the hollow waveguides used to contain the Raman medium. This work enabled the optimization of Raman power output and the design of the system’s collection optics. Other efforts include development of a new statistical algorithm that applies principal component analysis to extract the gas composition from a collected Raman spectrum. A novel apparatus replaced the spectrometer normally employed in a Raman sensor system by tunable optical filters in a derivative of wavelength modulation spectroscopy.
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Details
| Item Type: |
University of Pittsburgh ETD
|
| Status: |
Unpublished |
| Creators/Authors: |
|
| ETD Committee: |
|
| Date: |
30 January 2012 |
| Date Type: |
Publication |
| Defense Date: |
16 August 2011 |
| Approval Date: |
30 January 2012 |
| Submission Date: |
23 November 2011 |
| Access Restriction: |
No restriction; Release the ETD for access worldwide immediately. |
| Number of Pages: |
88 |
| Institution: |
University of Pittsburgh |
| Schools and Programs: |
Swanson School of Engineering > Electrical Engineering |
| Degree: |
MSEE - Master of Science in Electrical Engineering |
| Thesis Type: |
Master's Thesis |
| Refereed: |
Yes |
| Uncontrolled Keywords: |
Raman Scattering, Capillary waveguides, optical sensors, Principal component analysis |
| Date Deposited: |
30 Jan 2012 21:35 |
| Last Modified: |
15 Nov 2016 13:55 |
| URI: |
http://d-scholarship.pitt.edu/id/eprint/10548 |
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