Magnetic field sensor based on peanut-shape structure and multimode fiber  

作　　者：曹晔 赵月 童峥嵘 王艳 

机构地区：[1]School of Electronic and Information Engineering, Qingdao University [2]Communication Devices and Technology Engineering Research Center, School of Computer and Communication Engineering, Tianjin University of Technology

出　　处：《Optoelectronics Letters》2017年第3期184-187,共4页光电子快报（英文版）

基　　金：supported by the National High Technology Research and Development Program of China(No.2013AA014200);the National Natural Science Foundation of China(No.11444001);the Municipal Natural Science Foundation of Tianjin(No.14JCYBJC16500)

摘　　要：An all fiber magnetic field sensor with peanut-shape structure based on multimode fiber(MMF) is proposed and experimentally demonstrated. The sensing structure and magnetic fluid(MF) are both encapsulated in capillary, and the effective refractive index of MF is affected by surrounding magnetic field strength. The measurement of magnetic field is realized by observing the wavelength drift of interference peak. The transmission spectrum generated by Mach-Zehnder interferometer(MZI) includes core-core mode interference and core-cladding mode interference. Experimental results demonstrate that the core-cladding mode interference is sensitive to magnetic field, and the magnetic field sensitivity is 0.047 8 nm/mT. In addition, two kinds of interference dips are sensitive to temperature, and the sensitivities are 0.060 0 nm/°C and 0.052 6 nm/°C, respectively. So the simultaneous measurement of magnetic field strength and temperature can be achieved based on sensitivity matrix.

关 键 词：cladding interferometer simultaneous drift observing encapsulated capillary refractive immunity realized 

分 类 号：TN253[电子电信—物理电子学] TP212[自动化与计算机技术—检测技术与自动化装置]