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Droplet-like bent multimode fiber sensor for temperature and refractive index measurement

Sidek, Norbaya and Azmi, Asrul Izam and Abdul Razak, Mohd. Azhar and Salim, Mohd. Rashidi and Abdullah, A. S. and Mohd. Noor, Muhamad Y. (2018) Droplet-like bent multimode fiber sensor for temperature and refractive index measurement. ARPN Journal of Engineering and Applied Sciences, 13 (7). pp. 2465-2469. ISSN 1819-6608

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Official URL: http://www.arpnjournals.org/jeas/research_papers/r...

Abstract

This work proposes and demonstrates a bent multimode interference (MMI) sensor for refractive index and temperature measurement. The MMI structure was fabricated by successive splicing between single-mode-multimodesingle- mode (SMS) fibers. A droplet-like bent was introduced in the multimode fiber section for excitation of modes into the acrylate coating. The excitation of higher modes into the acrylate coating is particularly interesting due high thermooptic coefficient of acrylate which could improve temperature sensitivity, while evanescent field interaction of modes at the acrylate surface with surrounding material could be used for refractive index sensing. These modes experienced phase changes due to temperature and/or refractive index changes, consequently shift the spectra of the sensor. The sensor structure was simulated using BeamProp software to determine the required bending to excite light into acrylate coating for sensing. In experiment, a 3.5 mm bent sensor demonstrated refractive index sensitivity of 42.41 nm/RIU tested with refractive index between 1.30-1.395. Meanwhile, temperature sensitivity of 1.317nm/°C was attained using 5 mm bent sensor between 25 °C to 35 °C. The low cost and simple sensor structure is desirable in many applications including for detection, diagnosis, and determine of health, safety, environmental, liquid food, and water quality control.

Item Type:Article
Uncontrolled Keywords:Bent fiber, Curvature radius
Subjects:T Technology > TK Electrical engineering. Electronics Nuclear engineering
Divisions:Electrical Engineering
ID Code:85221
Deposited By: Widya Wahid
Deposited On:17 Mar 2020 08:01
Last Modified:17 Mar 2020 08:01

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