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.
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机译：提出并论证了一种基于单模多模单模（SMS）结构和磁流体（MF）的光纤磁场传感器。通过将一条无芯光纤用作SMS结构中的多模波导，并将MF密封在毛细管中作为磁敏介质，将其完全浸没在无芯光纤中，制成了全光纤磁传感器。可以通过测量透射光谱的倾角波长偏移或通过检测特定波长的透射损耗来实现对磁场强度的询问。制作并研究了灵敏度高达905 pm / mT和0.748 dB / mT的演示传感器。开发了用于所提出的设备设计的理论模型，并进行了数值模拟。
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