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Sensors 2016, 16(12), 2094;

Bent Fiber Sensor for Preservative Detection in Milk

Department of Electrical and Electronic Engineering, Erciyes University, Kayseri 38039, Turkey
Department of Electronic and Automation, Kaman Vocational College, Ahi Evran University, Kirsehir 40300, Turkey
Author to whom correspondence should be addressed.
Academic Editor: Monica Florescu
Received: 24 October 2016 / Revised: 29 November 2016 / Accepted: 6 December 2016 / Published: 9 December 2016
Full-Text   |   PDF [1992 KB, uploaded 9 December 2016]   |  


A fiber optic sensor sensitive to refractive index changes of the outer region of the fiber cladding is presented. The sensor uses bent plastic optical fibers in different bending lengths to increase sensitivity. Measurements were made for low-fat milk, the refractive index of which is altered by some preservatives such as formaldehyde, hydrogen peroxide, and sodium carbonate. Concentrations of the preservatives in the milk were changed between 0% and 14.3% while the refractive indices occurred between 1.34550 and 1.35093 for the minimum (0%) and maximum (14.286%) concentrations of sodium carbonate, respectively. Due to bending-induced sensitivity, the sensor is able to detect refractive index changes less of than 0.4%. The results show that there is excellent linearity between the concentration and normalized response of the sensor. View Full-Text
Keywords: bent fiber sensor; plastic optical fiber; concentration sensing; refractive index; milk bent fiber sensor; plastic optical fiber; concentration sensing; refractive index; milk

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Saracoglu, O.G.; Hayber, S.E. Bent Fiber Sensor for Preservative Detection in Milk. Sensors 2016, 16, 2094.

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