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


    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
    PublisherSPIE - International Society for Optical Engineering
    Publication date2016
    Article number99160E
    Publication statusPublished - 2016
    Event6th European Workshop on Optical Fibre Sensors - Limerick, Ireland
    Duration: 31 May 20163 Jun 2016
    Conference number: 6


    Conference6th European Workshop on Optical Fibre Sensors
    Internet address
    SeriesProceedings of SPIE - The International Society for Optical Engineering


    • 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,
    • 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


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