Abstract

This work reports on the use of an in-series silica and polymer fiber Bragg grating (FBG) to control the FBG strain sensitivities and enhance in the case of the polymer fiber Bragg grating (PFBG). Due to differences in the Young’s Modulus of the fibers employed, the amount of strain is unequally distributed in each fiber section. By acting on the silica fiber length, it was possible to control the strain sensitivity of the two FBGs, allowing a polymer FBG strain sensitivity much higher than the one found in the elementary fiber to be obtained. The influence of the diameter of the polymer fiber on the strain sensitivities of the FBGs was also investigated. Results have shown that, besides the strain sensitivity control, an even greater improvement in the PFBG strain sensitivity can be achieved.

Highlights

  • Fiber Bragg gratings (FBGs) are a well-known fiber optic device that has been attracting significant attention, in the research community, and in industry [1]

  • The strain characterization tests were performed in two stages, one considering the sensing head composed of raw fibers and another considering the microstructured polymer optical fiber (mPOF) with a reduced diameter

  • This work reports on the strain sensitivity control of FBGs in polymer and silica fibers by

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Summary

Introduction

Fiber Bragg gratings (FBGs) are a well-known fiber optic device that has been attracting significant attention, in the research community, and in industry [1]. A lower E value makes POFs appealing for high sensitivity hydrostatic pressure sensors [7] Other important characteristics, such as their high failure strain, which can reach values above 6% [8], the ability to be humidity sensitive or insensitive [9] and a much higher sensitivity to temperature change, make this fiber optic technology very promising for sensing applications. To the sensor offering a low measurement range In this this work, work, we we report report on on the the use use of of in‐series in-series silica silica and and polymer polymer fibers fibers for for the the control control of of FBG.

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