Femtosecond laser inscribed Bragg sensor in Terfenol-D coated optical fibre with ablated microslot for the detection of static magnetic fields

Graham N. Smith, Thomas D.P. Allsop, Kyriacos Kalli, Charalambos Koutsides, Ron Neal, Kate Sugden, Philip Culverhouse, Ian Bennion

Research output: Chapter in Book/Report/Conference proceedingOther chapter contribution

Abstract

A novel device for the detection and characterisation of static magnetic fields is presented. It consists of a femtosecond laser inscribed fibre Bragg grating (FBG) that is incorporated into an optical fibre with a femtosecond laser micromachined slot. The symmetry of the fibre is broken by the micro-slot, producing non-uniform strain across the fibre cross section. The sensing region is coated with Terfenol-D making the device sensitive to static magnetic fields, whereas the symmetry breaking results in a vectorial sensor for the detection of magnetic fields as low as 0.046 mT with a resolution of ±0.3mT in transmission and ±0.7mT in reflection. The sensor output is directly wavelength encoded from the FBG filtering, leading to simple demodulation through the monitoring of wavelength shifts that result as the fibre structure changes shape in response to the external magnetic field. The use of a femtosecond laser to both inscribe the FBG and micro-machine the slot in a single stage, prior to coating the device, significantly simplifies the sensor fabrication.
Original languageEnglish
Title of host publication21st international conference on optical fiber sensors
EditorsWojtek J. Bock, Jacques Albert, Xiaoyi Bao
PublisherSPIE
Number of pages4
ISBN (Print)978-0-8194-8246-4
DOIs
Publication statusPublished - Jan 2011
Event21st International Conference on Optical Fiber Sensors - Ottawa, ON, Canada
Duration: 15 May 201119 May 2011
http://www.ofs21.org/

Publication series

NameSPIE proceedings
PublisherSPIE
Volume7753
ISSN (Print)0277-786X

Conference

Conference21st International Conference on Optical Fiber Sensors
Abbreviated titleOFS21
CountryCanada
CityOttawa, ON
Period15/05/1119/05/11
Internet address

Bibliographical note

G. N. Smith ; T. Allsop ; K. Kalli ; C. Koutsides ; R. Neal ; K. Sugden ; P. Culverhouse and I. Bennion "Femtosecond laser inscribed Bragg sensor in Terfenol-D coated optical fibre with ablated microslot for the detection of static magnetic fields", Wojtek J. Bock ; Jacques Albert ; Xiaoyi Bao (eds); Proc. SPIE 7753, 21st International Conference on Optical Fiber Sensors, 77536N (May 17, 2011).
Copyright 2011 Society of Photo-Optical Instrumentation Engineers. One print or electronic copy may be made for personal use only. Systematic 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.
http://dx.doi.org/10.1117/12.885122

Keywords

  • fiber Bragg gratings
  • optical fiber sensors
  • femtosecond laser

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  • Research Output

    • 7 Conference publication

    870nm Bragg grating in single mode TOPAS microstructured polymer optical fibre

    Yuan, W., Webb, D. J., Kalli, K., Nielsen, K., Stefani, A., Rasmussen, H. K. & Bang, O., 2011, 21st International Conference on Optical Fiber Sensors. Bock, W. J., Albert, J. & Bao, X. (eds.). SPIE, 4 p. 77538X. (SPIE proceedings; vol. 7753).

    Research output: Chapter in Book/Report/Conference proceedingConference publication

    Open Access
    File
  • All-fibre twist sensor system based on 45° and 8° tilted fibre gratings

    Yan, Z., Adebayo, A., Zhou, K., Zhang, L. & Webb, D., 17 May 2011, 21st International Conference on Optical Fiber Sensors. Bock, W. J., Albert, J. & Bao, X. (eds.). Bellingham, WA (US): SPIE, 4 p. 77538E. (SPIE Proceedings; vol. 7753).

    Research output: Chapter in Book/Report/Conference proceedingConference publication

    Open Access
    File
  • Femtosecond laser inscribed superstructure fibre gratings

    Kalli, K., Koutsides, C., Davies, E., Komodromos, M., Webb, D. J. & Zhang, L., 17 May 2011, 21st International Conference on Optical Fiber Sensors. Bock, W. J., Albert, J. & Bao, X. (eds.). Bellingham, WA (US): SPIE, 4 p. 775393. (SPIE Proceedings; vol. 7753).

    Research output: Chapter in Book/Report/Conference proceedingConference publication

    Open Access
    File
  • Cite this

    Smith, G. N., Allsop, T. D. P., Kalli, K., Koutsides, C., Neal, R., Sugden, K., Culverhouse, P., & Bennion, I. (2011). Femtosecond laser inscribed Bragg sensor in Terfenol-D coated optical fibre with ablated microslot for the detection of static magnetic fields. In W. J. Bock, J. Albert, & X. Bao (Eds.), 21st international conference on optical fiber sensors (SPIE proceedings; Vol. 7753). SPIE. https://doi.org/10.1117/12.885122