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Foods 2018, 7(8), 117; https://doi.org/10.3390/foods7080117

Ethanol Measurement Using Hetero-Core Structured Optical Fiber Covered with Layer-By-Layer Thin Film

Department of Science and Engineering for Sustainable Innovation, Faculty of Science and Engineering, SOKA University, Hachioji, Tokyo 192-8577, Japan
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Received: 9 July 2018 / Revised: 23 July 2018 / Accepted: 23 July 2018 / Published: 25 July 2018
(This article belongs to the Special Issue Sensors Application in Food Analysis and Detection)
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Abstract

Ethanol measurements are performed in an ethanol/water solution utilizing an ethanol sensor based on a hetero-core structured optical fiber covered with a layer-by-layer thin film. The layer-by-layer (LbL) thin film was prepared using poly (allylamine hydrochloride) and poly styrene sulfonate. When the sensor was immersed in water, the propagating light intensity decreased with increasing ethanol concentration. This behavior suggested that the LbL film contracted due to the presence of ethanol, and the refractive index of the film increased, resulting in increasing propagating light leaks at the hetero-core of the fiber. The ethanol sensor was applied to a variety of spirits, and the propagating light intensity decreased with increasing ethanol concentration. View Full-Text
Keywords: hetero-core structured optical fiber; layer-by-layer thin film; ethanol sensor hetero-core structured optical fiber; layer-by-layer thin film; ethanol sensor
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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Kimura, Y.; Seki, A.; Watanabe, K. Ethanol Measurement Using Hetero-Core Structured Optical Fiber Covered with Layer-By-Layer Thin Film. Foods 2018, 7, 117.

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