Fiber-optical microphones and accelerometers based on polymer optical fiber Bragg gratings: [invited]

Scott Wu Yuan (Invited author), Alessio Stefani (Invited author), Ole Bang (Invited author), Torben K. Jacobsen (Invited author), Bjarke Rose (Invited author), Nicolai Herholdt-Rasmussen (Invited author), Finn Kryger Nielsen (Invited author), Søren Andresen (Invited author), Ole Brøsted Sørensen (Invited author), Knud Styhr Hansen (Invited author)

Research output: Contribution to journalConference articleResearchpeer-review


Polymer optical fibers (POFs) are ideal for applications as the sensing element in fiber-optical microphones and accelerometers based on fiber Bragg gratings (FBGs) due to their reduced Young’s Modulus of 3.2GPa, compared to 72GPa of Silica. To maximize the sensitivity and the dynamic range of the device the outer diameter and the length of the sensing fiber segment should be as small as possible. To this end we have fabricated 3mm FBGs in single-mode step-index POFs of diameter 115 micron, using 325nm UV writing and a phase-mask technique. 6mm POF sections with FBGs in the center have been glued to standard Silica SMF28 fibers. These POF FBGs have been characterized in terms of temperature and strain to find operating regimes with no hysteresis. Commercial fast wavelength interrogators (KHz) are shown to be able to track the thin POF FBGs and they are finally applied in a prototype accelerometer. The specs are compared to the specs obtained when using Silica FBGs.
Original languageEnglish
JournalProceedings of SPIE, the International Society for Optical Engineering
Pages (from-to)7726-1
Publication statusPublished - 2010
EventPhotonics Europe 2010 - Bruxelles, Belgium
Duration: 12 Apr 201016 Apr 2010


ConferencePhotonics Europe 2010
OtherProceedings volume 7712 + 7726
Internet address


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