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Proceedings Paper

Relative humidity sensor based on an optical microfiber knot resonator with a polyvinyl alcohol overlay
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Paper Abstract

A highly sensitive RH sensor based on the MKR with the PVA overlay is investigated. After making a tie using the microfiber with a diameter of 2 μm, the MRK with a loop diameter of 90 μm is fabricated and coated by using a PVA which can absorb humidity. The optical spectra of the MRK with the PVA overlay are converted to the spatial frequency spectra by using the FFT for precise measurement. The absorption of humidity in the proposed MKR-based sensing probe effectively changes the spatial frequency of the MKR. The RH sensitivities of the proposed MKR-based RH sensing prober with higher order modes can be dramatically improved.

Paper Details

Date Published: 28 September 2015
PDF: 4 pages
Proc. SPIE 9634, 24th International Conference on Optical Fibre Sensors, 96346X (28 September 2015); doi: 10.1117/12.2193572
Show Author Affiliations
Min-Seok Yoon, Hanyang Univ. (Korea, Republic of)
Kwang Wook Yoo, Hanyang Univ. (Korea, Republic of)
Young-Geun Han, Hanyang Univ. (Korea, Republic of)

Published in SPIE Proceedings Vol. 9634:
24th International Conference on Optical Fibre Sensors
Hypolito José Kalinowski; José Luís Fabris; Wojtek J. Bock, Editor(s)

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