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Proceedings Paper

Twisting compensation of optical multicore fiber shape sensors for flexible medical instruments
Author(s): Ignazio Floris; Javier Madrigal; Salvador Sales; Pedro A. Calderón; Jose M. Adam
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Paper Abstract

Shape sensing has become an area of great interest for many medical applications, such as epidural administration, colonoscopy, biopsies, and cardiac procedures, where real-time data of a dynamic object is required and visual contact is absent. Fiber Optic Shape Sensors (FOSS) consist of optical multi-fiber cables or Multicore Fibers (MCF) with embedded strain sensors, which can reconstruct the sensor shape from its multidimensional bending. Regrettably, the accuracy of three-dimensional shape sensing is remarkably restricted because of twisting, which makes impossible to correctly detect the bending direction. This paper reports an experimental study aimed at investigating the accuracy of optical shape sensors based on spun multicore fibers in sensing twisting, employing one of the most used multicore fiber geometry for sensing applications, the seven-core fiber. Firstly, a theoretical approach to model the mechanical behavior of multicore fiber was developed. Secondly, a pre-twisted fiber optic shape sensor was fabricated in the Institute for Telecommunications and Multimedia Applications (iTEAM), by inscribing four Fiber Bragg Gratings (FBG) in a Spun Multicore Fiber (diameter of 125.1 μm) with a pre-twisting of 64.9 rotation/meter, manufactured and provided by FIBERCORE. To conclude, a series of experiments were performed to corroborate the theoretical approach and evaluate the sensor performance. The proposed Spun-MCF-based Shape Sensor was able to sense twisting with a sensitivity of 0.23 pm/° and accuracy of 4.81° within a wide dynamic range of ± 270°, maintaining a perfectly elastic behavior at high level of twisting deformation

Paper Details

Date Published: 20 February 2020
PDF: 5 pages
Proc. SPIE 11233, Optical Fibers and Sensors for Medical Diagnostics and Treatment Applications XX, 1123316 (20 February 2020); doi: 10.1117/12.2543783
Show Author Affiliations
Ignazio Floris, Univ. Politécnica de Valencia (Spain)
Javier Madrigal, Univ. Politecnica de Valencia (Spain)
Salvador Sales, Univ. Politècnica de València (Spain)
Pedro A. Calderón, Univ. Politècnica de València (Spain)
Jose M. Adam, Univ. Politécnica de Valencia (Spain)

Published in SPIE Proceedings Vol. 11233:
Optical Fibers and Sensors for Medical Diagnostics and Treatment Applications XX
Israel Gannot, Editor(s)

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