Laser structured fibre Bragg gratings as enhanced force sensors

G. Marchi; V. Stephan; H. Huber; J. Roths

doi:10.1117/12.2194567

28 September 2015 Laser structured fibre Bragg gratings as enhanced force sensors

G. Marchi, V. Stephan, H. Huber, J. Roths

Proceedings Volume 9634, 24th International Conference on Optical Fibre Sensors; 963458 (2015) https://doi.org/10.1117/12.2194567
Event: International Conference on Optical Fibre Sensors (OFS24), 2015, Curitiba, Brazil

Abstract

The production and characterisation of a micro-structured FBG force sensor is described. Employing femtosecond laser micro machinery a circumferential ditch of about 30 μm depth and 40 μm width is engraved in the clad of an optical fibre at the centre of a 3 mm long type I fibre Bragg grating (FBG). The purpose of the structure is the enhancement of the force sensitivity characteristics for the measurement of sub-mN forces. Phase-shift spectra occur when axial stress is applied to the fibre. Exploiting this phenomenon experimental tests show a 10% improvement in the sensitivity performance when compared to an unstructured FBG.

Citation Download Citation

G. Marchi, V. Stephan, H. Huber, and J. Roths "Laser structured fibre Bragg gratings as enhanced force sensors", Proc. SPIE 9634, 24th International Conference on Optical Fibre Sensors, 963458 (28 September 2015); https://doi.org/10.1117/12.2194567

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