Keywords

electrical capacitance volume tomography, electrical capacitance tomography, image reconstruction, high contrast dielectrics, iterative algorithm, inverse problem, self-capacitance

Abstract

An Electrical Capacitance Volume Tomography system has been created for use with a new image reconstruction algorithm capable of imaging high contrast dielectric distributions. The electrode geometry consists of two 4 x 4 parallel planes of copper conductors connected through custom built switch electronics to a commercially available capacitance to digital converter. Typical electrical capacitance tomography (ECT) systems rely solely on mutual capacitance readings to reconstruct images of dielectric distributions. This dissertation presents a method of reconstructing images of high contrast dielectric materials using only the self capacitance measurements. By constraining the unknown dielectric material to one of two values, the inverse problem is no longer ill-determined. Resolution becomes limited only by the accuracy and resolution of the measurement circuitry. Images were reconstructed using this method with both synthetic and real data acquired using an aluminum structure inserted at different positions within the sensing region. Comparisons with standard two dimensional ECT systems highlight the capabilities and limitations of the electronics and reconstruction algorithm.

Notes

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Graduation Date

2007

Semester

Spring

Advisor

Schelling, Patrick

Degree

Doctor of Philosophy (Ph.D.)

College

College of Sciences

Department

Physics

Degree Program

Physics

Format

application/pdf

Identifier

CFE0001591

URL

http://purl.fcla.edu/fcla/etd/CFE0001591

Language

English

Release Date

May 2007

Length of Campus-only Access

None

Access Status

Doctoral Dissertation (Open Access)

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