XU Feng-tian,LUAN Pan-pan,JIA Ke-song,ZHANG Ai-ling.An optical fiber magnetic field sensor based on fiber spherical structure interferometer coated by magnetic fluid[J].Optoelectronics Letters,2015,11(5):379-381 An optical fiber magnetic field sensor based on fiber spherical structure interferometer coated by magnetic fluid Author Name Affiliation XU Feng-tian  College of Computer & Communication Engineering, Tianjin University of Technology, Tianjin 300384, China  LUAN Pan-pan  College of Computer & Communication Engineering, Tianjin University of Technology, Tianjin 300384, China  JIA Ke-song  College of Computer & Communication Engineering, Tianjin University of Technology, Tianjin 300384, China  ZHANG Ai-ling  College of Computer & Communication Engineering, Tianjin University of Technology, Tianjin 300384, China  Abstract:       A novel magnetic field sensor based on optical fiber Mach-Zehnder interferometer (MZI) coated by magnetic fluid (MF) is proposed. The MZI consists of two spherical structures formed on standard single mode fiber (SMF). The interference wavelength and the power of the sensing structure are sensitive to the external refractive index (RI). Since RI of the MF is sensitive to the magnetic field, the magnetic field measurement can be realized by detecting the variation of the interference spectrum. Experimental results show that the wavelength and the power of interference dip both increase with the increase of magnetic field intensity. Hits: 4295 Download times: 0 This work has been supported by the National Training Programs of Innovation and Entrepreneurship for Undergraduates of China View Full Text    Download reader