Journal of Lightwave Technology
2019
Multimode – Coreless – Multimode Fiber-based Sensors: Theoretical and Experimental Study
NOÉ SAN FABIÁN; ABIÁN B. SOCORRO-LERÁNOZ; IGNACIO DEL VILLAR; SILVIA DÍAZ; IGNACIO R. MATÍAS

Abstract

This paper presents a complete study on the spectral behavior of a multimode-coreless-multimode fiber-optic structure, as well as its application as a refractometer and liquid level sensor. The combination of two standard multimode fibers fused to a coreless fiber segment allows generating narrow interferometric bands in the optical spectrum, whose sensitivity can be improved by an adequate selection of the dimensions of the device (the coreless segment length and the diameter of the sensing area). A second way to improve the performance of the device is to deposit a thin-film of SnO2, which allows increasing the sensitivity up to 314 nm/RIU. This widens the number of applications where this structure can be used. As an example, a liquid level sensor with 0.73 nm/mm sensitivity is presented.

MATERIALS AND EXPERIMENTAL SET-UP

… The measurements of the water level were performed by immersing the sensors in ultrapure water using an ND-Dipper robot by Nadetech Innovations S.L.

Keywords: Optical fiber sensor; Refractive index; Multimode-coreless-multimode (MCM); Interferometer; Refractometer; Water level sensor.