Magnetic field sensor based on fiber Bragg grating with a spiral microgroove ablated by femtosecond laser.
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.
National Engineering Laboratory for Fiber Optic Sensing Technology, Wuhan University of Technology, Luoshi Road 122, Wuhan 430070, China. daiyt68@163.com
Yutang
Y
Dai
Minghong
M
Yang
Gang
G
Xu
Yinquan
Y
Yuan
D004867:Equipment Design; D019544:Equipment Failure Analysis; D005336:Fiber Optic Technology / Q000295:instrumentation*; D007834:Lasers; D060526:Magnetic Fields; D008280:Magnetics / Q000295:instrumentation*; D054802:Molecular Imprinting / Q000379:methods*; D011874:Radiometry / Q000295:instrumentation*; D012031:Refractometry / Q000295:instrumentation*