Simultaneous Magnetic Field and Temperature Measurement Based on No-Core Fiber Coated With Magnetic Fluid

In this paper, we propose and demonstrate a compact dual-parameter sensor for magnetic field intensity and temperature based on the singlemode no-core singlemode fiber. The no-core fiber (NCF) is coated with the magnetic fluid to detect the magnetic field and temperature simultaneously. The fundamental mode light launched from the singlemode fiber (SMF) will be decomposed into high-order modes lights in the NCF, and then, the high-order modes lights will finally interfere in the exit SMF. Because different interference dips have different sensitivities to the magnetic field intensity and temperature, the cross sensitivity of the magnetic field intensity and temperature can be effectively eliminated by monitoring two discrete interference dips. For the two dips monitored in the experiment, the proposed sensor has the magnetic field sensitivities of 7.43288 and 6.20037 pm/Oe, respectively, and the temperature sensitivities of -0.2469 and -0.28667 nm/°C, respectively. The proposed sensor is compact and easy to setup, and has good potential in applications.

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