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Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
Sensing performances for POF probes with different V-groove angles of 30°, 60°, and 90°, where the V-groove pitch and depth are 2.5 mm and 300 μm, respectively, and the refractive index of the liquid is 1.39.