Dai Yutang, Yang Minghong, Xu Gang, Yuan Yinquan
National Engineering Laboratory for Fiber Optic Sensing Technology, Wuhan University of Technology, Luoshi Road 122, Wuhan 430070, China.
Opt Express. 2013 Jul 15;21(14):17386-91. doi: 10.1364/OE.21.017386.
A novel magnetic field sensor based on Terfenol-D coated fiber Bragg grating with spiral microstructure was proposed and demonstrated. Through a specially-designed holder, the spiral microstructure was ablated into the fiber Bragg grating (FBG) cladding by femtosecond laser. Due to the spiral microstructure, the sensitivity of FBG coated with magnetostrictive film was enhanced greatly. When the spiral pitch is 50 μm and microgroove depth is 13.5 μm, the sensitivity of the magnetic field sensor is roughly 5 times higher than that of non-microstructured standard FBG. The response to magnetic field is reversible, and could be applicable for magnetic field detection.
提出并演示了一种基于涂覆有Terfenol-D的具有螺旋微结构的光纤布拉格光栅的新型磁场传感器。通过一个特殊设计的夹具，利用飞秒激光将螺旋微结构刻蚀到光纤布拉格光栅（FBG）包层中。由于螺旋微结构，涂覆有磁致伸缩薄膜的FBG的灵敏度大大提高。当螺旋节距为50μm且微槽深度为13.5μm时，磁场传感器的灵敏度大约是非微结构标准FBG的5倍。对磁场的响应是可逆的，可用于磁场检测。
