6 October 2017 All-fiber intensity bend sensor based on photonic crystal fiber with asymmetric air-hole structure
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Abstract
Monitoring the geometry of an moving element is a crucial task for example in robotics. The robots equipped with fiber bend sensor integrated in their arms can be a promising solution for medicine, physiotherapy and also for application in computer games. We report an all-fiber intensity bend sensor, which is based on microstructured multicore optical fiber. It allows to perform a measurement of the bending radius as well as the bending orientation. The reported solution has a special airhole structure which makes the sensor only bend-sensitive. Our solution is an intensity based sensor, which measures power transmitted along the fiber, influenced by bend. The sensor is based on a multicore fiber with the special air-hole structure that allows detection of bending orientation in range of 360°. Each core in the multicore fiber is sensitive to bend in specified direction. The principle behind sensor operation is to differentiate the confinement loss of fundamental mode propagating in each core. Thanks to received power differences one can distinguish not only bend direction but also its amplitude. Multicore fiber is designed to utilize most common light sources that operate at 1.55 μm thus ensuring high stability of operation. The sensitivity of the proposed solution is equal 29,4 dB/cm and the accuracy of bend direction for the fiber end point is up to 5 degrees for 15 cm fiber length. Such sensitivity allows to perform end point detection with millimeter precision.
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Dawid Budnicki, Lukasz Szostkiewicz, Michal O. Szymanski, Lukasz Ostrowski, Zbigniew Holdynski, Stanislaw Lipinski, Michal Murawski, Grzegorz Wojcik, Mariusz Makara, Krzysztof Poturaj, Pawel Mergo, Marek Napierala, Tomasz Nasilowski, "All-fiber intensity bend sensor based on photonic crystal fiber with asymmetric air-hole structure ", Proc. SPIE 10433, Electro-Optical and Infrared Systems: Technology and Applications XIV, 1043311 (6 October 2017); doi: 10.1117/12.2278650; https://doi.org/10.1117/12.2278650
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