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

Min-Seok Yoon; Kwang Wook Yoo; Young-Geun Han

doi:10.1117/12.2193572

28 September 2015 Relative humidity sensor based on an optical microfiber knot resonator with a polyvinyl alcohol overlay

Min-Seok Yoon, Kwang Wook Yoo, Young-Geun Han

Author Affiliations +

Proceedings Volume 9634, 24th International Conference on Optical Fibre Sensors; 96346X (2015) https://doi.org/10.1117/12.2193572
Event: International Conference on Optical Fibre Sensors (OFS24), 2015, Curitiba, Brazil

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.

Citation Download Citation

Min-Seok Yoon, Kwang Wook Yoo, and Young-Geun Han "Relative humidity sensor based on an optical microfiber knot resonator with a polyvinyl alcohol overlay", Proc. SPIE 9634, 24th International Conference on Optical Fibre Sensors, 96346X (28 September 2015); https://doi.org/10.1117/12.2193572

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