Zheng Jie, Dong Xinyong, Zu Peng, Shao Li-Yang, Chan Chi Chiu, Cui Ying, Shum Perry Ping
Institute of Optoelectronic Technology, China Jiliang University, Hangzhou 310018, China.
Opt Express. 2013 Jul 29;21(15):17863-8. doi: 10.1364/OE.21.017863.
A novel magnetic field sensor using tilted fiber Bragg grating (TFBG) interacting with magnetic fluid is proposed and experimentally demonstrated. The TFBG is surrounded by magnetic fluid whose complex refractive index changes with external magnetic field. The guiding properties of cladding modes excited by the TFBG are therefore modulated by the external magnetic field. As a result, the magnetic field strength measurement is successfully achieved within a range up to 196 Gauss by monitoring extinction ratio of cladding mode resonance. Furthermore, temperature variation can be obtained simultaneously from the wavelength shift of the TFBG transmission spectrum.
提出并通过实验证明了一种新型的利用倾斜光纤布拉格光栅（TFBG）与磁流体相互作用的磁场传感器。TFBG被磁流体包围，磁流体的复折射率随外部磁场而变化。因此，由TFBG激发的包层模式的导波特性受到外部磁场的调制。结果，通过监测包层模式共振的消光比，成功实现了在高达196高斯的范围内测量磁场强度。此外，可从TFBG透射谱的波长偏移中同时获得温度变化。
