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

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

Research output: Chapter in Book/Report/Conference proceedingConference 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 languageEnglish
Title of host publicationMicro-structured and specialty optical fibres
EditorsKyriacos Kalli, Alexis Mendez
PublisherSPIE
Number of pages6
Volume8426
DOIs
Publication statusPublished - 2012
EventMicrostructured and specialty optical fibres - Brussels, Belgium
Duration: 17 Apr 201219 Apr 2012

Publication series

NameSPIE proceedings
PublisherSPIE
ISSN (Print)0277-786X

Conference

ConferenceMicrostructured and specialty optical fibres
CountryBelgium
CityBrussels
Period17/04/1219/04/12

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

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  • Research Output

    • 3 Conference contribution

    An investigation into the wavelength stability of polymer optical fibre Bragg gratings

    Zhang, W., Abang, A., Webb, D. J. & Peng, G-D., 2012, Micro-structured and specialty optical fibres. Kalli, K. & Mendez, A. (eds.). SPIE, Vol. 8426. 8 p. (SPIE proceedings).

    Research output: Chapter in Book/Report/Conference proceedingConference publication

    Open Access
    File
  • Femtosecond and UV inscribed grating characterization in photonic crystal fibres: optimization for sensing applications

    Koutsides, C., Yiangou, E., Themistos, C., Komodromos, M., Christodoulides, P. & Kalli, K., 12 Apr 2012, Microstructured and specialty optical fibres. Kalli, K. & Mendez, A. (eds.). SPIE, 8 p. 84261O. (SPIE proceedings; vol. 8426).

    Research output: Chapter in Book/Report/Conference proceedingConference publication

    Open Access
    File
  • Optical RI sensor based on an in-fiber bragg grating fabry-perot cavity embedded with a micro-channel

    Yan, Z., Saffari, P., Zhou, K., Adebay, A. & Zhang, L., 12 Apr 2012, Microstructured and specialty optical fibres. Kalli, K. & Mendez, A. (eds.). SPIE, 7 p. 842609. (SPIE proceedings; vol. 8426).

    Research output: Chapter in Book/Report/Conference proceedingConference publication

    Open Access
    File
  • Cite this

    Zhang, W., Webb, D. J., & Peng, G-D. (2012). An intrinsic biochemical concentration sensor using a polymer optical fibre Bragg grating. In K. Kalli, & A. Mendez (Eds.), Micro-structured and specialty optical fibres (Vol. 8426). (SPIE proceedings). SPIE. https://doi.org/10.1117/12.922279