Sensitivity enhancement using annealed polymer optical fibre based sensors for pressure sensing applications

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

Research output: Chapter in Book/Report/Conference proceedingArticle in proceedingsResearchpeer-review

Abstract

Thermal annealing can be used to induce a permanent negative Bragg wavelength shift for polymer fibre grating sensors and it was originally used for multiplexing purposes. Recently, researchers showed that annealing can also provide additional benefits, such as strain and humidity sensitivity enhancement and augmented temperature operational range. The annealing process can change both the optical and mechanical properties of the fibre. In this paper, the annealing effects on the stress and force sensitivities of PMMA fibre Bragg grating sensors are investigated. The incentive for that investigation was an unexpected behaviour observed in an array of sensors which were used for liquid level monitoring. One sensor exhibited much lower pressure sensitivity and that was the only one that was not annealed. To further investigate the phenomenon, additional sensors were photo-inscribed and characterised with regard their stress and force sensitivities. Then, the fibres were annealed by placing them in hot water, controlling with that way the humidity factor. After annealing, stress and force sensitivities were measured again. The results show that the annealing can improve the stress and force sensitivity of the devices. This can provide better performing sensors for use in stress, force and pressure sensing applications.
Original languageEnglish
Title of host publicationProceedings of SPIE
Volume9916
PublisherSPIE - International Society for Optical Engineering
Publication date2016
Article number99160E
DOIs
Publication statusPublished - 2016
EventSixth European Workshop on Optical Fibre Sensors, - Limerick, Ireland
Duration: 31 May 20163 Jun 2016

Conference

ConferenceSixth European Workshop on Optical Fibre Sensors,
CountryIreland
CityLimerick
Period31/05/201603/06/2016
SeriesProceedings of S P I E - International Society for Optical Engineering
ISSN0277-786X

Keywords

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering
  • Annealing
  • Bragg gratings
  • Force sensitivity
  • POF
  • Polymer fibres
  • Stress sensors
  • Fiber Bragg gratings
  • Fibers
  • Humidity control
  • Nanofibers
  • Optical fibers
  • Plastic optical fibers
  • Polymers
  • Pressure sensors
  • Bragg wavelength shift
  • Fibre Bragg grating sensors
  • Liquid level monitoring
  • Optical and mechanical properties
  • Sensitivity enhancements
  • Stress sensor
  • OPTICS
  • PHYSICS,
  • BRAGG GRATINGS
  • HUMIDITY
  • STRAIN
  • annealing
  • force sensitivity
  • stress sensors
  • polymer fibres
  • Fibre optic sensors; fibre gyros
  • Pressure measurement
  • Measurement of mechanical variables
  • Fibre optic sensors
  • Pressure and vacuum measurement
  • Mechanical variables measurement
  • fibre optic sensors
  • force sensors
  • optical polymers
  • pressure sensors
  • sensor arrays
  • sensitivity enhancement
  • annealed polymer optical fibre based sensors
  • pressure sensing applications
  • thermal annealing
  • permanent negative Bragg wavelength shift
  • polymer fibre grating sensors
  • multiplexing
  • PMMA fibre Bragg grating sensors
  • liquid level monitoring
  • sensor array
  • stress sensitivity
  • hot water
  • humidity factor

Cite this

Pospori, A., Marques, C. A. F., Saez-Rodriguez, D., Nielsen, K., Bang, O., & Webb, D. J. (2016). Sensitivity enhancement using annealed polymer optical fibre based sensors for pressure sensing applications. In Proceedings of SPIE (Vol. 9916). [99160E] SPIE - International Society for Optical Engineering. Proceedings of S P I E - International Society for Optical Engineering https://doi.org/10.1117/12.2236877