Fiber Cross-Coupling Mechanisms in Optical Pressure Sensor Arrays

Bunge, Christian-Alexander; Kallweit, Jan; Colakoglu, L.; Gries, Thomas

doi:10.1109/sensors47125.2020.9278930

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2021

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“…These proof-of-concept experiments showed the applicability of the effect, but did not investigate the cross-coupling mechanism much further. In [29], the authors studied the coupling effects and their influences experimentally in order to increase the sensitivity.…”

Section: Introductionmentioning

confidence: 99%

Analysis of Fibre Cross-Coupling Mechanisms in Fibre-Optical Force Sensors

Bunge

Kallweit

Colakoglu

et al. 2021

Sensors

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The force-enhanced light coupling between two optical fibres is investigated for the application in a pressure or force sensor, which can be arranged into arrays and integrated into textile surfaces. The optical coupling mechanisms such as the influence of the applied force, the losses at the coupling point and the angular alignment of the two fibres are studied experimentally and numerically. The results reveal that most of the losses occur at the deformation of the pump fibre. Only a small percentage of the cross-coupled light from the pump fibre is actually captured by the probe fibre. Thus, the coupling and therefore the sensor signal can be strongly increased by a proper crossing angle between the fibres, which lead to a coupling efficiency of 3%, a sensitivity improvement of more than 20 dB compared to the orthogonal alignment of the two fibres.

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Section: Introductionmentioning

confidence: 99%