A temperature-independent fibre-optic magnetic-field sensor using thin core fibre tailored fibre Bragg grating

作者：Tian, Qin; Feng, Zhongyao^*; Rong, Qiangzhou^*; Wan, Yun; Qiao, Xueguang; Hu, Manli; Yang, Hangzhou; Wang, Ruohui; Shao, Zhihua; Yang, Tingting

来源：Optics Communications, 2017, 393: 169-172.

DOI：10.1016/j.optcom.2017.02.050

• Optical fibre sensor
• Refractive index sensing
• Magnetic fluid
• Magnetic field sensing

A temperature-independent fibre-optic magnetic-field sensor is proposed and demonstrated experimentally. The device consists of a thin-core fibre (TCF) sandwiched in the upstream of a fibre Bragg grating (FBG). Because of the core-mismatch between the TCF and the single-mode fibre (SMF), the core mode is coupled to the cladding modes within the TCF cladding, and parts of them are recoupled back to the leading-in SMF by the downstream FBG. The cladding modes are sensitive to the ambient refractive index (RI), and therefore have the ability to respond to a RI change in the magnetic fluid determined by the ambient magnetic field. The intensities of the cladding-mode resonances are highly sensitive to the magnetic field change, while, in contrast, the resonance wavelengths always remain unchanged. This property can allow the sensor to act as a power referenced reflection probe for magnetic field measurements.

• 出版日期2017-6-15
• 单位西北大学