28 September 2015 Laser structured fibre Bragg gratings as enhanced force sensors
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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.
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G. Marchi, G. Marchi, V. Stephan, V. Stephan, H. Huber, H. Huber, J. Roths, 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); doi: 10.1117/12.2194567; https://doi.org/10.1117/12.2194567
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