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2 mhz electrical resistance tomography for static liquid- solid profile measurement

Tomography is a technique used to reconstruct cross-sectional image of a pipeline for flow monitoring applications. There are several types of tomography system such as X-ray tomography, ultrasonic tomography, and electrical resistance tomography (ERT). ERT has many advantages compared to other type...

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Main Author: Abdul Wahab, Yasmin
Format: Thesis
Language:English
Published: 2017
Subjects:
TJ Mechanical engineering and machinery
Online Access:http://eprints.utm.my/id/eprint/81629/1/YasminAbdulWahabPFKE2017.pdf
http://eprints.utm.my/id/eprint/81629/
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spelling my.utm.816292019-09-10T01:50:11Z http://eprints.utm.my/id/eprint/81629/ 2 mhz electrical resistance tomography for static liquid- solid profile measurement Abdul Wahab, Yasmin TJ Mechanical engineering and machinery Tomography is a technique used to reconstruct cross-sectional image of a pipeline for flow monitoring applications. There are several types of tomography system such as X-ray tomography, ultrasonic tomography, and electrical resistance tomography (ERT). ERT has many advantages compared to other types of tomography such as low cost, robust and no radiation. Thus, it becomes particularly suitable for industrial applications. However, it has been observed that the conventional practice of ERT through invasive sensing technique has exposed the ERT metal sensor to corrosion and limited its application because of inaccurate measurement of the data. Consequently, non-invasive ERT has also been introduced in low frequency (in kHz) applied to the ERT system. The low frequency ERT makes use of the phase-sensitive demodulation (PSD) approach and is a complicated technique to implement. Hence, the goal of this research is to design and develop a non-invasive ERT system with a high frequency (2 MHz) source. A total impedance of coupling capacitances (between metal electrode and conductive medium) series with resistance (conductive medium) for each pair of electrodes was assumed in the research. Based on the mathematical equation of the total impedance, the real part is the resistance (conductive medium) must be larger than the imaginary part (capacitances), so that it can easily detect the concentration profile of the conductive medium. Therefore, the minimum frequency needed to ensure that the real part is bigger than the imaginary one is 2 MHz. Simultaneously, the independent and flexible sixteen ERT electrodes designed for the system make it easier to replace and troubleshoot any problems with the sensor. In addition, the experiment was carried out on a two-phase static liquid–solid regime for a linear back-projection algorithm using online configuration, with MATLAB as a software platform. It was also able to detect and visualize the non-homogenous system of the two-phase regime. Later, the reconstructed image was improved using a global threshold technique through offline configuration. The experiment results indicate that it could detect obstacles in a vertical pipe with minimum 12 mm in diameter and 4.5 cm in height. 2017 Thesis NonPeerReviewed application/pdf en http://eprints.utm.my/id/eprint/81629/1/YasminAbdulWahabPFKE2017.pdf Abdul Wahab, Yasmin (2017) 2 mhz electrical resistance tomography for static liquid- solid profile measurement. PhD thesis, Universiti Teknologi Malaysia. http://dms.library.utm.my:8080/vital/access/manager/Repository/vital:125921
institution Universiti Teknologi Malaysia
building UTM Library
collection Institutional Repository
continent Asia
country Malaysia
content_provider Universiti Teknologi Malaysia
content_source UTM Institutional Repository
url_provider http://eprints.utm.my/
language English
topic TJ Mechanical engineering and machinery
spellingShingle TJ Mechanical engineering and machinery
Abdul Wahab, Yasmin
2 mhz electrical resistance tomography for static liquid- solid profile measurement
description Tomography is a technique used to reconstruct cross-sectional image of a pipeline for flow monitoring applications. There are several types of tomography system such as X-ray tomography, ultrasonic tomography, and electrical resistance tomography (ERT). ERT has many advantages compared to other types of tomography such as low cost, robust and no radiation. Thus, it becomes particularly suitable for industrial applications. However, it has been observed that the conventional practice of ERT through invasive sensing technique has exposed the ERT metal sensor to corrosion and limited its application because of inaccurate measurement of the data. Consequently, non-invasive ERT has also been introduced in low frequency (in kHz) applied to the ERT system. The low frequency ERT makes use of the phase-sensitive demodulation (PSD) approach and is a complicated technique to implement. Hence, the goal of this research is to design and develop a non-invasive ERT system with a high frequency (2 MHz) source. A total impedance of coupling capacitances (between metal electrode and conductive medium) series with resistance (conductive medium) for each pair of electrodes was assumed in the research. Based on the mathematical equation of the total impedance, the real part is the resistance (conductive medium) must be larger than the imaginary part (capacitances), so that it can easily detect the concentration profile of the conductive medium. Therefore, the minimum frequency needed to ensure that the real part is bigger than the imaginary one is 2 MHz. Simultaneously, the independent and flexible sixteen ERT electrodes designed for the system make it easier to replace and troubleshoot any problems with the sensor. In addition, the experiment was carried out on a two-phase static liquid–solid regime for a linear back-projection algorithm using online configuration, with MATLAB as a software platform. It was also able to detect and visualize the non-homogenous system of the two-phase regime. Later, the reconstructed image was improved using a global threshold technique through offline configuration. The experiment results indicate that it could detect obstacles in a vertical pipe with minimum 12 mm in diameter and 4.5 cm in height.
format Thesis
author Abdul Wahab, Yasmin
author_facet Abdul Wahab, Yasmin
author_sort Abdul Wahab, Yasmin
title 2 mhz electrical resistance tomography for static liquid- solid profile measurement
title_short 2 mhz electrical resistance tomography for static liquid- solid profile measurement
title_full 2 mhz electrical resistance tomography for static liquid- solid profile measurement
title_fullStr 2 mhz electrical resistance tomography for static liquid- solid profile measurement
title_full_unstemmed 2 mhz electrical resistance tomography for static liquid- solid profile measurement
title_sort 2 mhz electrical resistance tomography for static liquid- solid profile measurement
publishDate 2017
url http://eprints.utm.my/id/eprint/81629/1/YasminAbdulWahabPFKE2017.pdf
http://eprints.utm.my/id/eprint/81629/
http://dms.library.utm.my:8080/vital/access/manager/Repository/vital:125921
_version_ 1646010317052837888
score 13.211869

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