Sensitivity improvement in a fiber macrobending refractive index sensor


Shaharuddin, Shahami and Ibrahim@Ghazali, Siti Azlida and Dambul, Katrina D. (2016) Sensitivity improvement in a fiber macrobending refractive index sensor. In: 2016 IEEE 6th International Conference on Photonics (ICP). IEEE, pp. 1-3. ISBN 978-1-4673-8153-6

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In this paper, sensitivity improvement in a fiber macrobending refractive index sensor is studied and an improved sensor model is proposed. The sensitivity can be improved by increasing the evanescent field produced by the fiber when it is bent. Theoretically, an increase in bending loss will increase the evanescent field region. The parameters that affect the bending loss are bending radius of the fiber, number of wrapping turns and critical radius of curvature (Rc). From the theoretical analysis results, a refractive index sensor with improved sensitivity is designed by using values from the analysis as a guideline: bending radius = 5.5 mm, number of wrapping turns = 1 - 5 turns and Rc = 5 - 13 mm. The proposed sensor uses a single mode fiber with an NA of 0.2 where the fiber has a bending radius limit of 5 mm. The cladding at the sensing part of the fiber is removed and the sensor probe is U-shape with several numbers of turns. The proposed sensor is expected to provide high sensitivity with a simple sensor configuration.

Item Type: Book Section
Uncontrolled Keywords: Optical fiber sensors, Optical fibers, Optical fiber cables, Sensitivity, Refractive index, Wrapping, Optical fiber testing
Subjects: T Technology > TA Engineering (General). Civil engineering (General) > TA1501-1820 Applied optics. Photonics
Divisions: Faculty of Engineering (FOE)
Depositing User: Ms Suzilawati Abu Samah
Date Deposited: 22 May 2018 11:10
Last Modified: 22 May 2018 11:10


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