Magnetic Field and Temperature Dual-Parameter Sensor Based on Nonadiabatic Tapered Microfiber Cascaded With FBG

Yuxiu Zhang,Shaokang Yan,Zijian Hao,Shengli Pu,Min Yuan,Chencheng Zhang,Dihui Li,Yongxi Li

doi:10.1109/access.2022.3148211

Abstract

A kind of dual-parameter sensor based on magnetic-fluid-coated nonadiabatic tapered microfiber (NTF) cascaded with fiber Bragg grating (FBG) is proposed and experimentally demonstrated. Simultaneous measurement of magnetic field and temperature is realized by monitoring the variation of NTF interference spectrum and FBG characteristic dip. In the magnetic field range of 0–18 mT, the highest magnetic field sensitivity can reach 1.159 nm/mT. The maximum temperature sensitivity is up to −1.737 nm/°C in the temperature range of 25-50 °C. The proposed magnetic-fluid-coated NTF interferometer cascaded with FBG will find extensive application prospect due to its high sensitivity, easy fabrication, compactness, strong robustness, and low cost.

Highlights

Compared with the traditional singlemode-multimodesinglemode (SMS) structure, tapered microfiber is an effective way to reduce fiber diameter and increase the interaction between evanescent field and the surrounding environment, which can lead to increase in sensitivity [1,2,3]
Tapered microfiber can be divided into adiabatic tapered microfiber (ATF) and nonadiabatic tapered microfiber (NTF) [16], [17]
In order to avoid possible bending and fracture of the tapered fiber, the three structures are first fixed in quartz groove, and encapsulated in tube filled with magnetic fluid (MF)

Summary

Introduction

Compared with the traditional singlemode-multimodesinglemode (SMS) structure, tapered microfiber is an effective way to reduce fiber diameter and increase the interaction between evanescent field and the surrounding environment, which can lead to increase in sensitivity [1,2,3]. Tapered microfiber can be divided into adiabatic tapered microfiber (ATF) and nonadiabatic tapered microfiber (NTF) [16], [17]. NTF has a large taper angle variation and the cladding mode excited in the cone region is coupled with the core mode. For ATF, the taper angle changes very small, and the coupling does not occur in the cone region

Methods

Results

Conclusion