Relative humidity sensor based on tapered plastic optical fibre with full-and spiral-patterned agarose gel coating

Roslan, F.S. and Saidin, Norazlina and Harun, S.W. and Md Ralib @ Md Raghib, Aliza 'Aini (2020) Relative humidity sensor based on tapered plastic optical fibre with full-and spiral-patterned agarose gel coating. In: 2020 18th IEEE Student Conference on Research and Development (SCOReD), 27th- 29th September 2020, Batu Pahat, Johor.

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Abstract

A relative humidity sensor based on plastic optical fibre (POF) is constructed by using chemical etching method. Agarose gel was chosen as the sensing layer with two different patterns which are fully coated pattern and spirally coated pattern. The agarose gel acts as a moisture absorbent due to its hydrophilic property. Full and spirally agarose coated fibre synthesis will be compared in terms of their sensitivity and limit of detection. The measured result shows that the spirally agarose-coated fibre has better sensitivity compared to the fully agarose-coated fibre. The increment in relative humidity percentage affected the refractive index of the cladding and contributed to higher leakage of transmitted light. As the relative humidity percentage (RH%) of magnesium chloride (MgCl2) inside the chamber varies from 50 RH% to 85 RH%, the output voltage of the spiral patterned fibre decreases linearly from 9.1 mV to 8.4 mV. It demonstrates the better linearity slope of over 80.95% and highest sensitivity of 0.0162 mV/% compared to the full patterned fibre. Hence, humidity sensor based on spirally agarose-coated POF demonstrates a high-resistant and reliable sensitivity towards the relative humidity of the ambient.

Item Type:	Conference or Workshop Item (Plenary Papers)
Additional Information:	Virtual conference
Uncontrolled Keywords:	relative humidity, POF, agarose gel, spiral pattern
Subjects:	T Technology > T Technology (General)
Kulliyyahs/Centres/Divisions/Institutes (Can select more than one option. Press CONTROL button):	Kulliyyah of Engineering Kulliyyah of Engineering > Department of Electrical and Computer Engineering
Depositing User:	Norazlina Saidin
Date Deposited:	15 Jan 2021 15:22
Last Modified:	18 Jan 2021 10:46
URI:	http://irep.iium.edu.my/id/eprint/87846

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