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Proceedings Paper

Laser structured fibre Bragg gratings as enhanced force sensors
Author(s): G. Marchi; V. Stephan; H. Huber; J. Roths
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Paper 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.

Paper Details

Date Published: 28 September 2015
PDF: 4 pages
Proc. SPIE 9634, 24th International Conference on Optical Fibre Sensors, 963458 (28 September 2015); doi: 10.1117/12.2194567
Show Author Affiliations
G. Marchi, Munich Univ. of Applied Sciences (Germany)
V. Stephan, Munich Univ. of Applied Sciences (Germany)
H. Huber, Munich Univ. of Applied Sciences (Germany)
J. Roths, Munich Univ. of Applied Sciences (Germany)

Published in SPIE Proceedings Vol. 9634:
24th International Conference on Optical Fibre Sensors
Hypolito José Kalinowski; José Luís Fabris; Wojtek J. Bock, Editor(s)

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