基于磁流体包覆的长周期光纤光栅磁场传感器

Magnetic Field Sensor Based on Long-Period Fiber Grating Packaged by Magnetic Fluid

光纤磁场传感器具有灵敏度高、体积小、耐腐蚀以及抗电磁干扰等优点,弥补了传统磁场传感器的不足,在军事、工业、电网等多个领域发挥着重要作用。使用二氧化碳激光器分别在标准通信单模光纤和光敏光纤上制备了两种类型的长周期光纤光栅(LPFG),将LPFG浸入磁流体中制备磁场传感器。当施加外部磁场时,LPFG的谐振波长会发生偏移。当磁场强度在1.6~25.5 mT范围内变化时,可达到的最大磁场灵敏度为126.5 pm/mT。该传感器在磁场或电场系统中具有潜在的应用。

The optical fiber magnetic field sensors have the advantages of high sensitivity,small size,corrosion resistance,and anti-electromagnetic interference,overcoming the drawbacks of the traditional magnetic field sensor,and play a crucial role in many industries,including military,business,and power grid.Two different types of long-period fiber gratings(LPFGs)have been fabricated on both traditional single-mode fiber and photosensitive fiber using a carbon dioxide laser.The magnetic field sensors can be created by submerging the LPFG into the magnetic fluid.The resonance wavelength of the LPFG will be shifted when being applied to an external magnetic field.The attained greatest sensitivity of the wavelength shift was 126.5 pm/mT when the magnetic strength varies in the range of 1.6-25.5 mT.The proposed magnetic fiber optic sensor has potential applications in magnetic or electric field systems.