Fiber-optic liquid level monitoring system using microstructured polymer fiber Bragg grating array sensors: performance analysis

C. A. F. Marques, A. Pospori, D. Saez-Rodriguez, Kristian Nielsen, Ole Bang, D. J. Webb

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Abstract

A highly sensitive liquid level monitoring system based on microstructured polymer optical fiber Bragg grating (mPOFBG) array sensors is reported for the first time. The configuration is based on five mPOFBGs inscribed in the same fiber in the 850 nm spectral region, showing the potential to interrogate liquid level by measuring the strain induced in each mPOFBG embedded in a silicone rubber (SR) diaphragm, which deforms due to hydrostatic pressure variations. The sensor exhibits a highly linear response over the sensing range, a good repeatability, and a high resolution. The sensitivity of the sensor is found to be 98 pm/cm of water, enhanced by more than a factor of 9 when compared to an equivalent sensor based on a silica fiber around 1550 nm. The temperature sensitivity is studied and a multi-sensor arrangement proposed, which has the potential to provide level readings independent of temperature and the liquid density.
Original languageEnglish
Title of host publicationProceedings of SPIE
Number of pages4
Volume9634
PublisherSPIE - International Society for Optical Engineering
Publication date2015
Article number96345V
ISBN (Print)9781628418392
DOIs
Publication statusPublished - 2015
Event24th International Conference on Optical Fibre Sensors - Curitiba , Brazil
Duration: 28 Sep 20152 Oct 2015

Conference

Conference24th International Conference on Optical Fibre Sensors
CountryBrazil
CityCuritiba
Period28/09/201502/10/2015
SeriesProceedings of SPIE, the International Society for Optical Engineering
Volume9634
ISSN0277-786X

Bibliographical note

Copyright 2015 Society of Photo Optical Instrumentation Engineers. One print or electronic copy may be made for personal use only. Systematic electronic or print 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

  • ENGINEERING,
  • OPTICS
  • PHYSICS,
  • OPTICAL-FIBER
  • CORE
  • Fiber Bragg gratings
  • Polymer optical fiber sensors
  • Liquid level monitoring systems
  • High sensitivity

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