Liquid droplet sensing using twisted optical fiber couplers fabricated by hydrofluoric acid flow etching

Gyeongho Son; Youngho Jung; Kyoungsik Yu

doi:10.1117/12.2265626

23 April 2017 Liquid droplet sensing using twisted optical fiber couplers fabricated by hydrofluoric acid flow etching

Gyeongho Son, Youngho Jung, Kyoungsik Yu

Proceedings Volume 10323, 25th International Conference on Optical Fiber Sensors; 103234J (2017) https://doi.org/10.1117/12.2265626
Event: 25th International Conference on Optical Fiber Sensors, 2017, Jeju, Korea, Republic of

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.

Citation Download Citation

Gyeongho Son, Youngho Jung, and Kyoungsik Yu "Liquid droplet sensing using twisted optical fiber couplers fabricated by hydrofluoric acid flow etching", Proc. SPIE 10323, 25th International Conference on Optical Fiber Sensors, 103234J (23 April 2017); https://doi.org/10.1117/12.2265626

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