Magnetic field sensor utilizing U-Shaped Cavity based on in-fiber Mach-Zehnder interferometer
An optical fiber magnetic field sensor is proposed and experimentally demonstrated by using a U-shaped cavity based on in-fiber Mach-Zehnder interferometer(MZI)coated with magnetic fluid(MF).The magnetic field sensor is manufactured by splicing a section of single-mode fiber(SMF)between two sec-tions of SMF with designed fiber geometric relationships.As the geometric symmetry MZI is strongly sensit-ive to the surrounding refractive index(RI)with a high sensitivity up to-13588 nm/RIU and MF's RI is sensitive to magnetic field,the magnetic field sensing function of the proposed structure is realized.The res-ults show that the magnetic field sensitivity reaches as high as 137 pm/Oe,and the magnetic field range is al-most linear from 0 to 250 Oe.The proposed magnetic field sensor has the advantages of small size,low cost,easy to manufacture,robustness,high sensitivity,good repeatability and easy to integrate with fiber optic sys-tems.
magnetic field sensormagnetic fluidU-shaped cavityoptical sensor
国家科技期刊平台
NSTL
万方数据
