An intrinsic biochemical concentration sensor using a polymer optical fibre Bragg grating

Wei Zhang; David J. Webb; Gang-Ding Peng

doi:10.1117/12.922279

An intrinsic biochemical concentration sensor using a polymer optical fibre Bragg grating

Wei Zhang, David J. Webb, Gang-Ding Peng

Aston Institute of Photonic Technologies (AiPT)

Research output: Chapter in Book/Published conference output › Conference publication

Abstract

A new type of fibre-optic biochemical concentration sensor based on a polymer optical fibre Bragg grating (POFBG) is proposed. The wavelength of the POFBG varies as a function of analyte concentration. The feasibility of this sensing concept is demonstrated by a saline concentration sensor. When polymer fibre is placed in a water based solution the process of osmosis takes place in this water-fibre system. An osmotic pressure which is proportional to the solution concentration, will apply to the fibre in addition to the hydraulic pressure. It tends to drive the water content out of the fibre and into the surrounding solution. When the surrounding solution concentration increases the osmotic pressure increases to drive the water content out of the fibre, consequently increasing the differential hydraulic pressure and reducing the POFBG wavelength. This process will stop once there is a balance between the osmotic pressure and the differential hydraulic pressure. Similarly when the solution concentration decreases the osmotic pressure decreases, leading to a dominant differential hydraulic pressure which drives the water into the fibre till a new pressure balance is established. Therefore the water content in the polymer fibre - and consequently the POFBG wavelength - depends directly on the solution concentration. A POFBG wavelength change of 0.9 nm was measured for saline concentration varying from 0 to 22%. For a wavelength interrogation system with a resolution of 1 pm, a measurement of solution concentration of 0.03% can be expected.

Original language	English
Title of host publication	Micro-structured and specialty optical fibres
Editors	Kyriacos Kalli, Alexis Mendez
Publisher	SPIE
Number of pages	6
Volume	8426
DOIs	https://doi.org/10.1117/12.922279
Publication status	Published - 2012
Event	Microstructured and specialty optical fibres - Brussels, Belgium Duration: 17 Apr 2012 → 19 Apr 2012

Publication series

Name	SPIE proceedings
Publisher	SPIE
ISSN (Print)	0277-786X

Conference

Conference	Microstructured and specialty optical fibres
Country/Territory	Belgium
City	Brussels
Period	17/04/12 → 19/04/12

Bibliographical note

Zhang, Wei; Webb, David J.; Peng, Gang-Ding. An intrinsic biochemical concentration sensor using a polymer optical fibre Bragg grating. In: Micro-structured and specialty optical fibres. ed. Kyriacos Kalli; Alexis Mendez. Vol. 8426 SPIE, 2012.

Copyright 2012 Society of Photo-Optical Instrumentation Engineers. One print or electronic copy may be made for personal use only. Systematic reproduction and distribution, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper are prohibited.

Keywords

Fibre Bragg grating
osmosis process
solution concentration
polymer swelling
PMMA

Access to Document

10.1117/12.922279

An intrinsic biochemical concentration sensor using a polymer optical fibre Bragg grating
Zhang, Wei; Webb, David J.; Peng, Gang-Ding. An intrinsic biochemical concentration sensor using a polymer optical fibre Bragg grating. In: Micro-structured and specialty optical fibres. ed. Kyriacos Kalli; Alexis Mendez. Vol. 8426 SPIE, 2012. Copyright 2012 Society of Photo-Optical Instrumentation Engineers. One print or electronic copy may be made for personal use only. Systematic reproduction and distribution, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper are prohibited.
Final published version, 288 KB

Cite this

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abstract = "A new type of fibre-optic biochemical concentration sensor based on a polymer optical fibre Bragg grating (POFBG) is proposed. The wavelength of the POFBG varies as a function of analyte concentration. The feasibility of this sensing concept is demonstrated by a saline concentration sensor. When polymer fibre is placed in a water based solution the process of osmosis takes place in this water-fibre system. An osmotic pressure which is proportional to the solution concentration, will apply to the fibre in addition to the hydraulic pressure. It tends to drive the water content out of the fibre and into the surrounding solution. When the surrounding solution concentration increases the osmotic pressure increases to drive the water content out of the fibre, consequently increasing the differential hydraulic pressure and reducing the POFBG wavelength. This process will stop once there is a balance between the osmotic pressure and the differential hydraulic pressure. Similarly when the solution concentration decreases the osmotic pressure decreases, leading to a dominant differential hydraulic pressure which drives the water into the fibre till a new pressure balance is established. Therefore the water content in the polymer fibre - and consequently the POFBG wavelength - depends directly on the solution concentration. A POFBG wavelength change of 0.9 nm was measured for saline concentration varying from 0 to 22%. For a wavelength interrogation system with a resolution of 1 pm, a measurement of solution concentration of 0.03% can be expected.",

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ER -

An intrinsic biochemical concentration sensor using a polymer optical fibre Bragg grating

Abstract

Publication series

Conference

Bibliographical note

Keywords

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