In order to make sensors more sensitive, ball-lensed optical fibers were used. Four different diameters of lenses were examined. Sensitivity to the presence of liquids was compared in all realized sensors. Moreover, the influence of distance between the transmitting and receiving optical fiber on the received optical power is also described in this paper. All developed sensors were tested at 1300 nm wavelength. In the last part of this paper the detailed discussion is given.
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B. Guzowski, M. Łakomski, K. Nowogrodzki, "Realization of a fiber optic sensor detecting the presence of a liquid," Proc. SPIE 10161, 14th International Conference on Optical and Electronic Sensors, 101610J (10 November 2016);