基于磁流体的干涉型光纤温度与磁场双测量传感器

Interferometric Fiber Optic Temperature and Magnetic Field Measurement Sensor Based on Magnetic Fluid

摘要:

将一种基于磁流体包覆的单模-大芯径多模光纤-单模-单模错位熔接(SMSS)构成的马赫-曾德干涉仪(MZI)和光纤光栅(FBG)相结合,利用磁流体的磁致折变效应和光纤光栅的温度灵敏特性,实现了低成本的温度与磁场双测量。利用光束传播法模拟分析了传感结构的内部光场,确定多模光纤的选型,熔接并制作了传感结构,建立敏感矩阵,实现温度与磁场的同时测量。实验测试结果表明,该传感结构的磁场与温度灵敏度分别为15.9pm/Oe和-161.7pm/℃。

Abstract:

In this paper, a Machzende interferometer (MZI) based on magnetic fluid coated single-mode-large-core multi-mode fiber-single-mode-single-mode dislocation fusion (SMSS) is combined with fiber grating (FBG). By taking advantage of the magnetorefractive effect of magnetic fluid and the temperature-sensitive property of fiber grating, the dual measurement of temperature and magnetic field is realized at low cost. The beam propagation method is used to simulate and analyze the internal light field of the sensing structure, determine the selection of multi-mode fiber, fuse and make the sensing structure, establish the sensitive matrix, and realize the simultaneous measurement of temperature and magnetic field. Experimental results show that the magnetic field sensitivity and temperature sensitivity of the sensor structure are 15.9pm/Oe and -161.7pm/℃, respectively.