Towards an enhanced pipeline health monitoring system : optical fiber bragg grating (FBG) temperature sensor

Increasing natural gas consumption in Singapore has led to an ever expanding network of pipelines for delivery and transportation of gas. These pipes transporting highly pressurized flammable gas often run underground and real-time pipeline health monitoring system is highly essential for detection...

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Main Author: Leam, Li Ling
Other Authors: Chan Chi Chiu
Format: Final Year Project
Language:English
Published: 2015
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Online Access:http://hdl.handle.net/10356/64954
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Institution: Nanyang Technological University
Language: English
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spelling sg-ntu-dr.10356-649542023-03-03T15:33:25Z Towards an enhanced pipeline health monitoring system : optical fiber bragg grating (FBG) temperature sensor Leam, Li Ling Chan Chi Chiu School of Chemical and Biomedical Engineering DRNTU::Engineering::Bioengineering Increasing natural gas consumption in Singapore has led to an ever expanding network of pipelines for delivery and transportation of gas. These pipes transporting highly pressurized flammable gas often run underground and real-time pipeline health monitoring system is highly essential for detection of the location of small cracks prior to devastating ruptures. Over the years, different techniques such as non-optical systems have been developed to measure leakage in gas pipelines. However, most of these methods are very expensive and incapable of detecting the exact leak location. Optical based monitoring techniques like Fiber Bragg grating (FBG) are cheap and safe and can potentially be used for the real-time condition monitoring of gas pipelines. Already, FBGs have been demonstrated for the sensing of temperature and strain, both of which are critical in determining the structural health of pipelines. In this thesis, we investigate the effect of metallization on the temperature sensitivity of FBG. The temperature sensitivity of 1.31 ± 0.09 µm, 6.10 ± 0.9 µm, 8.52 ± 0.6 µm and 13.17±1.15 µm thick nickel coated FBG sensors were 0.01203 nm/°C, 0.01427 nm/°C, 0.01505 nm/°C and 0.01627 nm/°C respectively, representing a significant improvement over uncoated FBG. The thickness of the metal is found to have a direct correlation with temperature sensitivity. The hysteresis of the metal coated fiber is less than 1 % and the limit of detection is less than 0.2°C. Crucially, the FBGs can be connected in series along an optical fiber to carry out simultaneous temperature measurement of multiple locations. Thus, the fabricated FBG temperature sensors can potentially be used as a component of an optical system for early detection of gas leakage in pipelines. Bachelor of Engineering (Chemical and Biomolecular Engineering) 2015-06-09T08:17:04Z 2015-06-09T08:17:04Z 2015 2015 Final Year Project (FYP) http://hdl.handle.net/10356/64954 en Nanyang Technological University 75 p. application/pdf
institution Nanyang Technological University
building NTU Library
continent Asia
country Singapore
Singapore
content_provider NTU Library
collection DR-NTU
language English
topic DRNTU::Engineering::Bioengineering
spellingShingle DRNTU::Engineering::Bioengineering
Leam, Li Ling
Towards an enhanced pipeline health monitoring system : optical fiber bragg grating (FBG) temperature sensor
description Increasing natural gas consumption in Singapore has led to an ever expanding network of pipelines for delivery and transportation of gas. These pipes transporting highly pressurized flammable gas often run underground and real-time pipeline health monitoring system is highly essential for detection of the location of small cracks prior to devastating ruptures. Over the years, different techniques such as non-optical systems have been developed to measure leakage in gas pipelines. However, most of these methods are very expensive and incapable of detecting the exact leak location. Optical based monitoring techniques like Fiber Bragg grating (FBG) are cheap and safe and can potentially be used for the real-time condition monitoring of gas pipelines. Already, FBGs have been demonstrated for the sensing of temperature and strain, both of which are critical in determining the structural health of pipelines. In this thesis, we investigate the effect of metallization on the temperature sensitivity of FBG. The temperature sensitivity of 1.31 ± 0.09 µm, 6.10 ± 0.9 µm, 8.52 ± 0.6 µm and 13.17±1.15 µm thick nickel coated FBG sensors were 0.01203 nm/°C, 0.01427 nm/°C, 0.01505 nm/°C and 0.01627 nm/°C respectively, representing a significant improvement over uncoated FBG. The thickness of the metal is found to have a direct correlation with temperature sensitivity. The hysteresis of the metal coated fiber is less than 1 % and the limit of detection is less than 0.2°C. Crucially, the FBGs can be connected in series along an optical fiber to carry out simultaneous temperature measurement of multiple locations. Thus, the fabricated FBG temperature sensors can potentially be used as a component of an optical system for early detection of gas leakage in pipelines.
author2 Chan Chi Chiu
author_facet Chan Chi Chiu
Leam, Li Ling
format Final Year Project
author Leam, Li Ling
author_sort Leam, Li Ling
title Towards an enhanced pipeline health monitoring system : optical fiber bragg grating (FBG) temperature sensor
title_short Towards an enhanced pipeline health monitoring system : optical fiber bragg grating (FBG) temperature sensor
title_full Towards an enhanced pipeline health monitoring system : optical fiber bragg grating (FBG) temperature sensor
title_fullStr Towards an enhanced pipeline health monitoring system : optical fiber bragg grating (FBG) temperature sensor
title_full_unstemmed Towards an enhanced pipeline health monitoring system : optical fiber bragg grating (FBG) temperature sensor
title_sort towards an enhanced pipeline health monitoring system : optical fiber bragg grating (fbg) temperature sensor
publishDate 2015
url http://hdl.handle.net/10356/64954
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