Measurements of dielectric constants and loss tangents of metal-backed concrete specimen using a zero finding technique/ Mohd Noor Hashim

Measurements of dielectric constants and loss tangents of metal-backed concrete specimen using a zero finding technique/ Mohd Noor Hashim

A free space microwave measurement system is used for the high temperature measurement of dielectric constant and loss tangent of homogeneous material and is applicable to composite materials as well. Since the existence of moisture in concrete is a major cause of damage to pavements and other concr...

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Main Author: Hashim, Mohd Noor
Format: Thesis
Language:English
Published: 1998
Online Access:https://ir.uitm.edu.my/id/eprint/101051/1/101051.pdf
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spelling my-uitm-ir.1010512024-08-22T09:54:19Z Measurements of dielectric constants and loss tangents of metal-backed concrete specimen using a zero finding technique/ Mohd Noor Hashim 1998 Hashim, Mohd Noor A free space microwave measurement system is used for the high temperature measurement of dielectric constant and loss tangent of homogeneous material and is applicable to composite materials as well. Since the existence of moisture in concrete is a major cause of damage to pavements and other concrete structures, there is an increasing need for non-destructive detection and monitoring of moisture content before failure occurs. Thus, this measurement system operating in the 8.0 -12.5 GHz frequency range is used for reflection coefficient, (Sn) measurement of concrete samples at room temperature. The dielectric constant and loss tangent values are calculated from the measured data using a zero finding technique. Dielectric properties are correlated to water content by dielectric mixture theory. Water content will be measured for different wet specimen of concrete, with varying the value of air void content. Key components of measurement system are Spot-focusing hom lens antennas, Wiltron Vector Network Analyzer, Mode transition, Computer and Printer. Errors due multiple reflections between antennas via the surface of the sample are corrected by using a free space LRL (Line, Reflect, Line) calibration technique. 1998 Thesis https://ir.uitm.edu.my/id/eprint/101051/ https://ir.uitm.edu.my/id/eprint/101051/1/101051.pdf text en public degree Universiti Teknologi MARA (UiTM) Faculty of Electrical Engineering Kumar, Deepak
institution Universiti Teknologi MARA
collection UiTM Institutional Repository
language English
advisor Kumar, Deepak
description A free space microwave measurement system is used for the high temperature measurement of dielectric constant and loss tangent of homogeneous material and is applicable to composite materials as well. Since the existence of moisture in concrete is a major cause of damage to pavements and other concrete structures, there is an increasing need for non-destructive detection and monitoring of moisture content before failure occurs. Thus, this measurement system operating in the 8.0 -12.5 GHz frequency range is used for reflection coefficient, (Sn) measurement of concrete samples at room temperature. The dielectric constant and loss tangent values are calculated from the measured data using a zero finding technique. Dielectric properties are correlated to water content by dielectric mixture theory. Water content will be measured for different wet specimen of concrete, with varying the value of air void content. Key components of measurement system are Spot-focusing hom lens antennas, Wiltron Vector Network Analyzer, Mode transition, Computer and Printer. Errors due multiple reflections between antennas via the surface of the sample are corrected by using a free space LRL (Line, Reflect, Line) calibration technique.
format Thesis
qualification_level Bachelor degree
author Hashim, Mohd Noor
spellingShingle Hashim, Mohd Noor
Measurements of dielectric constants and loss tangents of metal-backed concrete specimen using a zero finding technique/ Mohd Noor Hashim
author_facet Hashim, Mohd Noor
author_sort Hashim, Mohd Noor
title Measurements of dielectric constants and loss tangents of metal-backed concrete specimen using a zero finding technique/ Mohd Noor Hashim
title_short Measurements of dielectric constants and loss tangents of metal-backed concrete specimen using a zero finding technique/ Mohd Noor Hashim
title_full Measurements of dielectric constants and loss tangents of metal-backed concrete specimen using a zero finding technique/ Mohd Noor Hashim
title_fullStr Measurements of dielectric constants and loss tangents of metal-backed concrete specimen using a zero finding technique/ Mohd Noor Hashim
title_full_unstemmed Measurements of dielectric constants and loss tangents of metal-backed concrete specimen using a zero finding technique/ Mohd Noor Hashim
title_sort measurements of dielectric constants and loss tangents of metal-backed concrete specimen using a zero finding technique/ mohd noor hashim
granting_institution Universiti Teknologi MARA (UiTM)
granting_department Faculty of Electrical Engineering
publishDate 1998
url https://ir.uitm.edu.my/id/eprint/101051/1/101051.pdf
_version_ 1811769123685793792

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