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Permanent link (DOI): https://doi.org/10.7939/R3MC8RQ6P

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Analysis of Dielectric Loaded Circular Waveguide Probes for Time Domain Reflectometry Open Access

Descriptions

Other title
Subject/Keyword
dispersion
liquid characterization
measurement accuracy
dielectric constant
dielectric loaded waveguides
guided wave radar (GWR)
permittivity measurement
liquid level measurement
time domain reflectometry (TDR)
circular waveguide
radio frequency (RF)
Type of item
Thesis
Degree grantor
University of Alberta
Author or creator
Ryziuk, Christopher B R
Supervisor and department
Karumudi, Rambabu (Electrical and Computer Engineering)
Examining committee member and department
Moez, Kambiz (Electrical and Computer Engineering)
Thundat, Thomas (Chemical and Materials Engineering)
Department
Department of Electrical and Computer Engineering
Specialization
Electromagnetics and Microwaves
Date accepted
2014-03-06T08:57:13Z
Graduation date
2014-06
Degree
Master of Science
Degree level
Master's
Abstract
Time domain reflectometry has been used for fluid level measurement and characterization since the 1960's, however, there is little research present in the literature to improve the measurements by using alternate probe designs. Numerical analysis of a dielectric loaded circular waveguide probe has determined that appropriately chosen dimensions and dielectric loading will allow for control of the reflection coefficient and consequently its permittivity accuracy. Additionally, the resulting reduction in signal velocity allows for an increase in height measurement accuracy. A detailed optimization procedure has been developed and implemented with MATLAB to determine the required probe dimensions and dielectric loading for a particular lossless application. Using Ansoft HFSS the validity of the lossless method was confirmed at low frequencies for lossy ethanol-water and acetic acid solutions. At 1GHz the procedure yields parameters that allow for accuracy increases on the order of 5 to 20 times that of a traditional probe.
Language
English
DOI
doi:10.7939/R3MC8RQ6P
Rights
Permission is hereby granted to the University of Alberta Libraries to reproduce single copies of this thesis and to lend or sell such copies for private, scholarly or scientific research purposes only. Where the thesis is converted to, or otherwise made available in digital form, the University of Alberta will advise potential users of the thesis of these terms. The author reserves all other publication and other rights in association with the copyright in the thesis and, except as herein before provided, neither the thesis nor any substantial portion thereof may be printed or otherwise reproduced in any material form whatsoever without the author's prior written permission.
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