Humidity sensor based on a single-mode hetero-core fiber structure

Qiang Wu; Yuliya Semenova; Jinesh Mathew; Pengfei Wang; Gerald Farrell

doi:10.1364/OL.36.001752

Humidity sensor based on a single-mode hetero-core fiber structure

Opt Lett. 2011 May 15;36(10):1752-4. doi: 10.1364/OL.36.001752.

Authors

Qiang Wu¹, Yuliya Semenova, Jinesh Mathew, Pengfei Wang, Gerald Farrell

Affiliation

¹ Photonics Research Center, School of Electronic and Communications Engineering, Dublin Institute of Technology, Kevin Street, Dublin 8, Ireland. qiang.wu@dit.ie

PMID: 21593879
DOI: 10.1364/OL.36.001752

Abstract

Using a small-core single-mode fiber (SCSMF), a novel relative humidity (RH) sensor based on an SMF28-SCSMF-SMF28 fiber structure was proposed in this paper. By depositing a humidity sensitive material, such as poly (ethylene oxide) (PEO) on the bare SCSMF fiber, the proposed structure can act as an RH sensor with high sensitivity. Experiments demonstrated that the proposed RH sensor with PEO coating can achieve a sensitivity of 430 nm per relative humidity unit (RHU) in the RH range from 80% to 83% RH and a sensitivity of 50 nm per RHU in the RH range from 83% to 95% RH.