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Q: Fachverband Quantenoptik und Photonik
Q 44: Laser Development and Applications
Q 44.8: Vortrag
Donnerstag, 12. März 2020, 12:45–13:00, f435
Optical bend sensor based on micro-structured polymer optical fibres — •Lennart Leffers1, Kort Bremer1, Bernhard Roth1, and Ludger Overmeyer2 — 1Hannover Centre for Optical Technologies, Leibniz Universität Hannover, Nienburger Straße 17, 30167 Hannover, Germany — 2Institute of Transport und Automation Technology, Leibniz Universität Hannover, An der Universität 2, 30823 Garbsen, Germany
We investigate a highly flexible and elastic bend sensor based on polymer optical fibre (POF) with Bragg grating (BG) structures. The concept is very simple and relies on the inscription of BG structures eccentrically into a graded-index (GI) multi-mode (MM) POF via contact exposure with a phase mask and a KrF excimer laser in the UV. Depending on the deformation of the POF, the lattice constant of the inscribed BG is compressed or strained due to its position relative to the fibre core. This in turn will result in a red or blue shift of the Bragg wavelength, respectively. Therefore, with a single BG the deformation in one axis can be observed. Moreover, multiple BGs inscribed into the same POF at different positions would allow to determine the shape deformation of the POF relative to a reference frame. Consequently, this technology could form the basis for new applications in the areas of robotics, augmented reality or in medical diagnostics, for example, the monitoring of the neurological movement disorder focal dystonia.