HEC/PVDF coated microbottle resonators for relative humidity detection

Zain, H. A. and Batumalay, M. and Rahim, H. R. A. and Yasin, M. and Harun, S. W. (2021) HEC/PVDF coated microbottle resonators for relative humidity detection. Optik, 232. ISSN 0030-4026, DOI https://doi.org/10.1016/j.ijleo.2021.166534.

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A micro-bottle resonator sensor is proposed here for relative humidity detection with an HEC/PVDF coating acting as a transducer. Microbottle resonators are a promising fiber optics sensing structure due to their high-quality factor and HEC/PVDF is used in detecting relative humidity due to its sensitivity to moisture and humidity. Soften-and-compress technique was used to form a 190 mu m bulge micro-bottle sensing element. A 3 mu m tapered microfiber was used to optically excite the micro-bottle resonator which showed a Q factor in an order of 10(5). The HEC/PVDF coated MBR resonator sensor showed good response to changes in relative humidity range of 40-80 %RH. The HEC/PVDF coated element had a sensitivity of 0.111 dB/RH% and linearity of 95 %. The HEC/PVDF absorption of water molecules with increasing relative humidity, the subsequent change in refractive index and change in the light propagation characteristics of the sensor improved the sensor's response to relative humidity compared to the uncoated one. The proposed sensor's simple fabrication, good sensitivity, linearity, and resolution make it a prom-ising design for relative humidity detection.

Item Type: Article
Funders: Universiti Malaya (IIRG005A19IISS), INTI Research Grant Scheme 2020 (INTI-FITS-03-2020), Airlangga University Research Grant (2021)
Uncontrolled Keywords: Micro-bottle resonator sensor; Tapered silica microfiber fiber; Humidity sensor; Relative humidity; HEC/PVDF
Subjects: T Technology > TK Electrical engineering. Electronics Nuclear engineering
Divisions: Faculty of Engineering > Department of Electrical Engineering
Depositing User: Ms Zaharah Ramly
Date Deposited: 17 Jun 2022 02:36
Last Modified: 17 Jun 2022 02:36
URI: http://eprints.um.edu.my/id/eprint/27938

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