Quasi-distributed oxygen sensor based on evanescent wave scattering in optical fiber / Maizatul Zolkapli

This thesis deliberates the development and characterization of a multipoint quasidistributed optical fiber sensor for oxygen measurement based on luminescence quenching. Current sensing devices such as the Clark cell or the luminescent probes located at distinct points in the water column are incap...

Full description

Saved in:

Bibliographic Details
Main Author:	Zolkapli, Maizatul
Format:	Thesis
Language:	English
Published:	2019
Subjects:	Mechanical and electrical engineering combined
Online Access:	https://ir.uitm.edu.my/id/eprint/61925/1/61925.PDF
Tags:	Add Tag No Tags, Be the first to tag this record!

id	my-uitm-ir.61925
record_format	uketd_dc
spelling	my-uitm-ir.619252022-07-24T00:16:39Z Quasi-distributed oxygen sensor based on evanescent wave scattering in optical fiber / Maizatul Zolkapli 2019-04 Zolkapli, Maizatul Mechanical and electrical engineering combined This thesis deliberates the development and characterization of a multipoint quasidistributed optical fiber sensor for oxygen measurement based on luminescence quenching. Current sensing devices such as the Clark cell or the luminescent probes located at distinct points in the water column are incapable of providing the dissolved oxygen measurement for the entire area of the pond in toto. Hence there is a need for the development of a new technique which measures the level of oxygen in the water at various depths and locations within a single optical fiber line. Towards this objective the new technique developed is based on luminescence quenching which reflect the overall oxygen concentration in aquaculture ponds. The research focuses on the development of a sensing mechanism which could be applied to optical fiber cladding/core region to produce optical fiber oxygen sensor in quasi-distributed arrangement and subsequently characterized using a suitable test method under laboratory conditions. The system is based on 1 mm core diameter plastic optical fiber where three sections of cladding have been etched using acetone resulting in a parabolic shaped cavity characteristic of the refractive index profile of the fiber. These cavities were then filled with sol-gel derived silica doped with the oxygen-sensitive dye. In this study ruthenium complex Tris(4,7-diphenyl-l,10-phenanthroline) ruthenium(II)dichloride complex(Ru(dpp)32+), platinum octaethylporphyrin (PtOEP) andpalladium(II)-5,10,15,20-tetrakis-(2,3,4,5,6-pentafluorophenyl)-porphyrin (PdTFPP)were the dyes chosen, immobilized in a microporous glass produced by the low temperature sol-gel process to form the various sensing locations. Each of the luminophores had different emission wavelengths resulting in individual spectral peaks associated with each of the sensing points. Advantages of using this method of reagent capture are discussed and the sensor fabrication steps deliberated. Interrogation of the optical sensor system was through a fiber optic spectrometer incorporating narrow bandpass emission optical filter. Experimental characterization for the quasi-distributed optical fiber oxygen sensor in both gas and water were detailed. Results from the present study showed that the proposed sensors exhibited comparable sensitivity and repeatability as well as fast response and recovery towards oxygen. Io/Iioo among the three films for both gaseous and dissolved oxygen were Ru(dpp)32+< PtOEP < PdTFPP. 2019-04 Thesis https://ir.uitm.edu.my/id/eprint/61925/ https://ir.uitm.edu.my/id/eprint/61925/1/61925.PDF text en public phd doctoral Universiti Teknologi MARA Faculty of Electrical Engineering Abdullah, Wan Fazlida Hanim (Assoc. Prof. Dr. )
institution	Universiti Teknologi MARA
collection	UiTM Institutional Repository
language	English
advisor	Abdullah, Wan Fazlida Hanim (Assoc. Prof. Dr. )
topic	Mechanical and electrical engineering combined
spellingShingle	Mechanical and electrical engineering combined Zolkapli, Maizatul Quasi-distributed oxygen sensor based on evanescent wave scattering in optical fiber / Maizatul Zolkapli
description	This thesis deliberates the development and characterization of a multipoint quasidistributed optical fiber sensor for oxygen measurement based on luminescence quenching. Current sensing devices such as the Clark cell or the luminescent probes located at distinct points in the water column are incapable of providing the dissolved oxygen measurement for the entire area of the pond in toto. Hence there is a need for the development of a new technique which measures the level of oxygen in the water at various depths and locations within a single optical fiber line. Towards this objective the new technique developed is based on luminescence quenching which reflect the overall oxygen concentration in aquaculture ponds. The research focuses on the development of a sensing mechanism which could be applied to optical fiber cladding/core region to produce optical fiber oxygen sensor in quasi-distributed arrangement and subsequently characterized using a suitable test method under laboratory conditions. The system is based on 1 mm core diameter plastic optical fiber where three sections of cladding have been etched using acetone resulting in a parabolic shaped cavity characteristic of the refractive index profile of the fiber. These cavities were then filled with sol-gel derived silica doped with the oxygen-sensitive dye. In this study ruthenium complex Tris(4,7-diphenyl-l,10-phenanthroline) ruthenium(II)dichloride complex(Ru(dpp)32+), platinum octaethylporphyrin (PtOEP) andpalladium(II)-5,10,15,20-tetrakis-(2,3,4,5,6-pentafluorophenyl)-porphyrin (PdTFPP)were the dyes chosen, immobilized in a microporous glass produced by the low temperature sol-gel process to form the various sensing locations. Each of the luminophores had different emission wavelengths resulting in individual spectral peaks associated with each of the sensing points. Advantages of using this method of reagent capture are discussed and the sensor fabrication steps deliberated. Interrogation of the optical sensor system was through a fiber optic spectrometer incorporating narrow bandpass emission optical filter. Experimental characterization for the quasi-distributed optical fiber oxygen sensor in both gas and water were detailed. Results from the present study showed that the proposed sensors exhibited comparable sensitivity and repeatability as well as fast response and recovery towards oxygen. Io/Iioo among the three films for both gaseous and dissolved oxygen were Ru(dpp)32+< PtOEP < PdTFPP.
format	Thesis
qualification_name	Doctor of Philosophy (PhD.)
qualification_level	Doctorate
author	Zolkapli, Maizatul
author_facet	Zolkapli, Maizatul
author_sort	Zolkapli, Maizatul
title	Quasi-distributed oxygen sensor based on evanescent wave scattering in optical fiber / Maizatul Zolkapli
title_short	Quasi-distributed oxygen sensor based on evanescent wave scattering in optical fiber / Maizatul Zolkapli
title_full	Quasi-distributed oxygen sensor based on evanescent wave scattering in optical fiber / Maizatul Zolkapli
title_fullStr	Quasi-distributed oxygen sensor based on evanescent wave scattering in optical fiber / Maizatul Zolkapli
title_full_unstemmed	Quasi-distributed oxygen sensor based on evanescent wave scattering in optical fiber / Maizatul Zolkapli
title_sort	quasi-distributed oxygen sensor based on evanescent wave scattering in optical fiber / maizatul zolkapli
granting_institution	Universiti Teknologi MARA
granting_department	Faculty of Electrical Engineering
publishDate	2019
url	https://ir.uitm.edu.my/id/eprint/61925/1/61925.PDF
_version_	1783735239530512384

Quasi-distributed oxygen sensor based on evanescent wave scattering in optical fiber / Maizatul Zolkapli

Similar Items