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Proceedings Paper

Liquid droplet sensing using twisted optical fiber couplers fabricated by hydrofluoric acid flow etching
Author(s): Gyeongho Son; Youngho Jung; Kyoungsik Yu
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Paper Abstract

We report a directional-coupler-based refractive index sensor and its cost-effective fabrication method using hydrofluoric acid droplet wet-etching and surface-tension-driven liquid flows. The proposed fiber sensor consists of a pair of twisted tapered optical fibers with low excess losses. The fiber cores in the etched microfiber region are exposed to the surrounding medium for efficient interaction with the guided light. We observe that the etching-based low-loss fiber-optic sensors can measure the water droplet volume by detecting the refractive index changes of the surrounding medium around the etched fiber core region.

Paper Details

Date Published: 23 April 2017
PDF: 4 pages
Proc. SPIE 10323, 25th International Conference on Optical Fiber Sensors, 103234J (23 April 2017); doi: 10.1117/12.2265626
Show Author Affiliations
Gyeongho Son, Korea Advanced Institute of Science and Technology (Korea, Republic of)
Youngho Jung, Korea Advanced Institute of Science and Technology (Korea, Republic of)
Kyoungsik Yu, Korea Advanced Institute of Science and Technology (Korea, Republic of)


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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