Force and temperature characteristics of a fs-laser machined locally micro-structured FBG

Franz J. Dutz; Gabriele Marchi; Valentin Stephan; Heinz P. Huber; Johannes Roths

doi:10.1117/12.2236836

30 May 2016 Force and temperature characteristics of a fs-laser machined locally micro-structured FBG

Franz J. Dutz, Gabriele Marchi, Valentin Stephan, Heinz P. Huber, Johannes Roths

Proceedings Volume 9916, Sixth European Workshop on Optical Fibre Sensors; 991621 (2016) https://doi.org/10.1117/12.2236836
Event: Sixth European Workshop on Optical Fibre Sensors (EWOFS'2016), 2016, Limerick, Ireland

Abstract

A locally micro-structured fiber Bragg grating (LMFBG) was manufactured by forming a circumferential groove in the middle of a type I fiber Bragg grating (FBG). The groove was directly ablated using a fs-laser and had a length of 86μm, a depth of 27μm and steep side walls. Due to the precisely machined geometry of the structure the reflection spectra can be accurately described with a fairly simple theoretical model. At several constant temperatures in the range from 5°C to 45°C this structure was exposed to various compressive loads in the range from 0N to -1.42N. Here the force and temperature sensitivity of the LMFBG are presented. This structure can be used for miniaturized compressive force sensing at variable temperatures, which is of particular interest for many bio-medical applications.

Citation Download Citation

Franz J. Dutz, Gabriele Marchi, Valentin Stephan, Heinz P. Huber, and Johannes Roths "Force and temperature characteristics of a fs-laser machined locally micro-structured FBG", Proc. SPIE 9916, Sixth European Workshop on Optical Fibre Sensors, 991621 (30 May 2016); https://doi.org/10.1117/12.2236836

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