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Reflective type optical fiber sensors’ transducer based on a photopolymer microtip
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Paper Abstract

The aim of this work was to design a miniature size optical fiber sensors` transducer which is sensitive to refractive index changes. A polymer microtip manufactured by photopolymerization at the end of a multi-mode optical fiber was used as a transducer. Proper geometry parameters of the microptips allow to use these elements as transducers for reflective types of the refractive index sensors. Two various multi-mode optical fibers were used in the experiments, i.e. a gradient-index with a 62.5 μm core diameter and a step-index with a 105 μm core diameter. They were selected to test influence of light propagation properties on the optical fiber transducer reflective parameters. Optical Backscatter Reflectometer was applied to validate mentioned above transducers’ parameters. The principle of sensors’ work was based on measurement of an amplitude of back scattered signal when the refractive index of liquid around the microtip was changed. Experimental tests were made when the selected microtip was immersed into liquids with various refractive indices in the range of 1.30 – 1.70. Minimal amplitude of the reflected signal occurred when the refractive index of the liquid was equal to the refractive index of the microtip. For both tested optical fiber types, changes of the liquid refractive index caused proportional changes of the signal reflected from the microtip. Maximal measured sensitivity of such optical fiber transducer of 180 dB/RIU with a dynamic range of 32 dB was achieved. Therefore, it is possible to use these micro-elements as transducers for the refractive index optical fiber sensor.

Paper Details

Date Published: 28 August 2019
PDF: 4 pages
Proc. SPIE 11199, Seventh European Workshop on Optical Fibre Sensors, 111992X (28 August 2019); doi: 10.1117/12.2540020
Show Author Affiliations
Monika Chruściel, Wojskowa Akademia Techniczna im. Jaroslawa Dabrowskiego (Poland)
Paweł Marć, Wojskowa Akademia Techniczna im. Jaroslawa Dabrowskiego (Poland)
Leszek R. Jaroszewicz, Wojskowa Akademia Techniczna im. Jaroslawa Dabrowskiego (Poland)


Published in SPIE Proceedings Vol. 11199:
Seventh European Workshop on Optical Fibre Sensors
Kyriacos Kalli; Sinead O. O'Keeffe; Gilberto Brambilla, Editor(s)

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