Fiber optic sensing of magnetic fields utilizing femtosecond laser sculpted microslots and long period gratings coated with Terfenol-D

Graham C. B. Lee; Tom Allsop; Changle Wang; Ron Neal; Philip Culverhouse; David J. Webb

doi:10.1117/12.2194325

28 September 2015 Fiber optic sensing of magnetic fields utilizing femtosecond laser sculpted microslots and long period gratings coated with Terfenol-D

Graham C. B. Lee, Tom Allsop, Changle Wang, Ron Neal, Philip Culverhouse, David J. Webb

Author Affiliations +

Proceedings Volume 9634, 24th International Conference on Optical Fibre Sensors; 96340K (2015) https://doi.org/10.1117/12.2194325
Event: International Conference on Optical Fibre Sensors (OFS24), 2015, Curitiba, Brazil

Abstract

Fiber optic sensors are fabricated for detecting static magnetic fields. The sensors consist of a UV inscribed long period grating with two 50 micron long microslots. The microslots are fabricated using the femtosecond laser based inscribe and etch technique. The microslots and the fiber surface are coated with a magnetostrictive material Terfenol-D. A spectral sensitivity of 1.15 pm/mT was measured in transmission with a working resolution of ±0.2 mT for a static magnetic field strength below 10 mT. These devices also present a different response when the spatial orientation of the fiber was adjusted relative to the magnetic field lines.

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Graham C. B. Lee, Tom Allsop, Changle Wang, Ron Neal, Philip Culverhouse, and David J. Webb "Fiber optic sensing of magnetic fields utilizing femtosecond laser sculpted microslots and long period gratings coated with Terfenol-D ", Proc. SPIE 9634, 24th International Conference on Optical Fibre Sensors, 96340K (28 September 2015); https://doi.org/10.1117/12.2194325

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