Optical fiber magnetic field sensor based on single-mode–multimode–single-mode structure and magnetic fluid

作者：Yaofei Chen, Qun Han, Tiegen Liu, Xinwei Lan, Hai Xiao · 发表于：Optics Letters · 年份：2013 · DOI：10.1364/ol.38.003999 · 被引用次数：261 · 研究领域：Advanced Fiber Optic Sensors、Photonic and Optical Devices、Optical Network Technologies

An optical fiber magnetic field sensor based on the single-mode-multimode-single-mode (SMS) structure and magnetic fluid (MF) is proposed and demonstrated. By using a piece of no-core fiber as the multimode waveguide in the SMS structure and MF sealed in a capillary tube as the magnetic sensitive media, which totally immersing the no-core fiber, an all-fiber magnetic sensor was fabricated. Interrogation of the magnetic field strength can be achieved either by measuring the dip wavelength shift of the transmission spectrum or by detecting the transmission loss at a specific wavelength. A demonstration sensor with sensitivities up to 905 pm/mT and 0.748 dB/mT was fabricated and investigated. A theoretical model for the design of the proposed device was developed and numerical simulations were performed.