Hydrostatic pressure sensing using a polymer optical fibre Bragg gratings

Ian P. Johnson; David J. Webb; Kyriacos Kalli

doi:10.1117/12.914391

30 January 2012 Hydrostatic pressure sensing using a polymer optical fibre Bragg gratings

Ian P. Johnson, David J. Webb, Kyriacos Kalli

Proceedings Volume 8351, Third Asia Pacific Optical Sensors Conference; 835106 (2012) https://doi.org/10.1117/12.914391
Event: Asia Pacific Optical Sensors Conference, 2012, Sydney, Australia

Abstract

The sensitivity of a fibre Bragg grating (FBG) sensor fabricated in polymer optical fibre (POF) to hydrostatic pressure was investigated for the first time. In this initial investigative work a reflected Bragg response of a FBG fabricated in multimode microstructured POF (MMmPOF) was monitored, whilst the hydrostatic pressure was increased up to 10MPa. Positive sensitivities were observed, meaning a positive wavelength shift to increasing pressure, as opposed to negative sensitivities monitored when using a FBG sensor fabricated in silica optical fibre. The FBG sensors fabricated in the MMmPOF gave fractional changes in wavelength and hence sensitivities of at least 64.05×10^-6/MPa, which is some 25 times larger than the -2.50×10^-6/MPa sensitivity of a FBG sensor fabricated in silica optical fibre that was measured in this work. Furthermore this work highlighted a decrease in sensitivity of the FBG sensor fabricated in the MMmPOF by some 50% by sealing the holes of the mPOF at the tip of the fibre with an adhesive. This offers the potential to tailor the response of the sensor to hydrostatic pressure.

Citation Download Citation

Ian P. Johnson, David J. Webb, and Kyriacos Kalli "Hydrostatic pressure sensing using a polymer optical fibre Bragg gratings", Proc. SPIE 8351, Third Asia Pacific Optical Sensors Conference, 835106 (30 January 2012); https://doi.org/10.1117/12.914391

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