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Proceedings Paper

Compact relative humidity sensor based on an Agarose hydrogel coated silica microsphere resonator
Author(s): Arun Kumar Mallik; Dejun Liu; Vishnu Kavungal; Xiaokang Lian; Gerald Farrell; Qiang Wu; Yuliya Semenova
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Paper Abstract

In this paper, we propose a novel approach to measurements of low relative humidity (RH) levels based on the whispering gallery modes (WGMs) phenomenon in a silica microsphere resonator coated with Agarose. The spectral dips of the WGM resonances excited in the proposed sensor depend strongly on the changes in the refractive index (RI) of the coating material as well as the surrounding RI. A study of the humidity-induced RI changes in a thin Agarose layer, applied to the surface of a 162 μm-diameter silica microsphere was carried out by correlating the experimental results and numerical simulations performed using the perturbation theory. We experimentally demonstrate a linear sensing characteristic in a low-humidity range from 10% to 45% RH. The estimated quality factor of the micro-resonator is 2.82×106 and detection limit for the sensor is 0.057 %RH, corresponding to the RI resolution of 8.4×10-7 RIU.

Paper Details

Date Published: 23 April 2017
PDF: 4 pages
Proc. SPIE 10323, 25th International Conference on Optical Fiber Sensors, 103230C (23 April 2017); doi: 10.1117/12.2263529
Show Author Affiliations
Arun Kumar Mallik, Dublin Institute of Technology (Ireland)
Dejun Liu, Dublin Institute of Technology (Ireland)
Vishnu Kavungal, Dublin Institute of Technology (Ireland)
Xiaokang Lian, Dublin Institute of Technology (Ireland)
Gerald Farrell, Dublin Institute of Technology (Ireland)
Qiang Wu, Northumbria Univ. (United Kingdom)
Yuliya Semenova, Dublin Institute of Technology (Ireland)

Published in SPIE Proceedings Vol. 10323:
25th International Conference on Optical Fiber Sensors
Youngjoo Chung; Wei Jin; Byoungho Lee; John Canning; Kentaro Nakamura; Libo Yuan, Editor(s)

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