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A Novel Approach to Double the Sensitivity of Polarization Maintaining Interferometric Fiber Optic Gyroscope
Open AccessLetter

Sensitivity Enhancement of Curvature Fiber Sensor Based on Polymer-Coated Capillary Hollow-Core Fiber

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Electronics Department, DICIS, Universidad de Guanajuato, Carretera Salamanca-Valle de Santiago km 3.5 + 1.8, Salamanca 36885, Mexico
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CONACYT-Electronics Department, DICIS, Universidad de Guanajuato, Carretera Salamanca-Valle de Santiago km 3.5 + 1.8, Salamanca 36885, Mexico
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Fiber and Integrated Optics Laboratory (FIOLab), Centro de Investigaciones en Óptica A.C., Aguascalientes 20200, Mexico
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Centro de Investigaciones en Óptica A.C., Calle Lomas del Bosque 115, León 37150, Mexico
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Author to whom correspondence should be addressed.
Sensors 2020, 20(13), 3763; https://doi.org/10.3390/s20133763
Received: 9 June 2020 / Revised: 2 July 2020 / Accepted: 3 July 2020 / Published: 5 July 2020
(This article belongs to the Section Optical Sensors)
In this paper, we propose and experimentally demonstrate a simple technique to enhance the curvature sensitivity of a bending fiber optic sensor based on anti-resonant reflecting optical waveguide (ARROW) guidance. The sensing structure is assembled by splicing a segment of capillary hollow-core fiber (CHCF) between two single-mode fibers (SMF), and the device is set on a steel sheet for measuring different curvatures. Without any surface treatment, the ARROW sensor exhibits a curvature sensitivity of 1.6 dB/m−1 in a curvature range from 0 to 2.14 m−1. By carefully coating half of the CHCF length with polydimethylsiloxane (PDMS), the curvature sensitivity of the ARROW sensor is enhanced to −5.62 dB/m−1, as well as an increment in the curvature range (from 0 to 2.68 m−1). Moreover, the covered device exhibits a low-temperature sensitivity (0.038 dB/°C), meaning that temperature fluctuations do not compromise the bending fiber optic sensor operation. The ARROW sensor fabricated with this technique has high sensitivity and a wide range for curvature measurements, with the advantage that the technique is cost-effective and easy to implement. All these features make this technique appealing for real sensing applications, such as structural health monitoring. View Full-Text
Keywords: curvature sensing; ARROW guidance; PDMS covering; capillary hollow-core fiber curvature sensing; ARROW guidance; PDMS covering; capillary hollow-core fiber
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MDPI and ACS Style

Herrera-Piad, L.A.; Hernández-Romano, I.; May-Arrioja, D.A.; Minkovich, V.P.; Torres-Cisneros, M. Sensitivity Enhancement of Curvature Fiber Sensor Based on Polymer-Coated Capillary Hollow-Core Fiber. Sensors 2020, 20, 3763. https://doi.org/10.3390/s20133763

AMA Style

Herrera-Piad LA, Hernández-Romano I, May-Arrioja DA, Minkovich VP, Torres-Cisneros M. Sensitivity Enhancement of Curvature Fiber Sensor Based on Polymer-Coated Capillary Hollow-Core Fiber. Sensors. 2020; 20(13):3763. https://doi.org/10.3390/s20133763

Chicago/Turabian Style

Herrera-Piad, Luis A.; Hernández-Romano, Iván; May-Arrioja, Daniel A.; Minkovich, Vladimir P.; Torres-Cisneros, Miguel. 2020. "Sensitivity Enhancement of Curvature Fiber Sensor Based on Polymer-Coated Capillary Hollow-Core Fiber" Sensors 20, no. 13: 3763. https://doi.org/10.3390/s20133763

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