Abstract
An ultra-sensitive optical fiber humidity sensor based on an extrinsic Fabry-Perot interferometer is proposed and experimentally demonstrated in this paper. the Fabry-Perot cavity is constructed by a section of humidity-sensitive metal-paper coil and an optical fiber end face. Taking advantage of the hydrophilicity of the metal-paper coil, the cavity length of the Fabry-Perot cavity varies with humidity due to the deflection of the metal-paper section. the fabricated sensor shows a linear response to relative humidity (RH) spanning from 50%RH to 73%RH. More prominently, an ultra-high sensitivity of 32.5 μm%RH (change in cavity length/change in RH) or 63.5 nm%RH (wavelength shift/change in RH) was achieved over other optical fiber humidity sensors previously reported to our knowledge.
Recommended Citation
C. Zhu and J. Huang, "Highly Sensitive Humidity Sensor based on Optical Fiber Fabry-Perot Interferometer," Proceedings of IEEE Sensors, Institute of Electrical and Electronics Engineers, Jan 2023.
The definitive version is available at https://doi.org/10.1109/SENSORS56945.2023.10325064
Department(s)
Electrical and Computer Engineering
Keywords and Phrases
Fabry-Perot interferometer; fiber optic sensor; humidity
International Standard Serial Number (ISSN)
2168-9229; 1930-0395
Document Type
Article - Conference proceedings
Document Version
Citation
File Type
text
Language(s)
English
Rights
© 2025 Institute of Electrical and Electronics Engineers, All rights reserved.
Publication Date
01 Jan 2023