HEC/PVDF coated microbottle resonators for relative humidity detection
Document Type
Article
Publication Date
4-1-2021
Abstract
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.
Keywords
Micro-bottle resonator sensor, Tapered silica microfiber fiber, Humidity sensor, Relative humidity, HEC/PVDF
Divisions
sch_ecs
Funders
Universiti Malaya (IIRG005A19IISS),INTI Research Grant Scheme 2020 (INTI-FITS-03-2020),Airlangga University Research Grant (2021)
Publication Title
Optik
Volume
232
Publisher
Elsevier
Publisher Location
HACKERBRUCKE 6, 80335 MUNICH, GERMANY