Abstract

In this work a multiparameter plastic optical fiber (POF) sensor is presented. A three lobes POF consisting of polymethylmethacrylate (PMMA) core and a fluorinated polymer (FP) for the cladding was fabricated. The aim is to use a plastic fiber with non-circular shape to implement a bending direction and rotation sensor. The mode confinement in the plastic filament obtained with the extrusion process was simulated, and the effect of bending evaluated. The POF sensor is interrogated in transmission using an LED as light source and a charge-coupled device (CCD) to capture the light intensity distribution inside the core, and then analyze the changes when a bending or a rotation is applied.

Highlights

  • In recent years, fiber-based sensors have played an important role in many applications: in bridge security monitoring [1], biochemical sensing [2], gas concentration detection [3] and power system monitoring [4], due to their advantages, such as small size, immunity to electromagnetic interference, remote sensing capability and high sensitivity

  • Novel fiber sensors are mainly fabricated by innovating the structure of fiber grating or inscribing grating in special fibers instead of standard single mode fibers (SMF)

  • The bend direction sensing principle is based on the shift of the light modes that propagate in the three lobes fiber of the PMMA when the plastic filament is bent

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Summary

Introduction

Fiber-based sensors have played an important role in many applications: in bridge security monitoring [1], biochemical sensing [2], gas concentration detection [3] and power system monitoring [4], due to their advantages, such as small size, immunity to electromagnetic interference, remote sensing capability and high sensitivity. Novel fiber sensors are mainly fabricated by innovating the structure of fiber grating or inscribing grating in special fibers instead of standard single mode fibers (SMF). These developments are focused on solving the problem of the cross-sensitivity between temperature and strain and on implementing multi parameters fiber sensors for new measurands. The three lobes shape of the fiber was conceived to implement a low-cost optical fiber sensor for bending direction and rotation. The bend direction sensing principle is based on the shift of the light modes that propagate in the three lobes fiber of the PMMA when the plastic filament is bent. The paper is structured as follow: the first section is a brief presentation of the process used to fabricate the polymer fiber and the result of the preliminary simulations of the mode confinement in the obtained structure; the second section is concerned with presenting the experimental results obtained using the fabricated fiber; the conclusion and the future development are commented in the last section

Fiber Fabrication and Simulation of the Sensor
Experimental Results
Conclusions and Future Development
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