Dong Shaohua, Pu Shengli, Wang Haotian
Opt Express. 2014 Aug 11;22(16):19108-16. doi: 10.1364/OE.22.019108.
A kind of magnetic field sensor composed of magnetic fluid surrounding a segment of singlemode fiber is proposed. The taper-like and lateral-offset fusion splicing techniques are employed. The sensing principle is based on cladding mode interference. The interference valley wavelength or transmission loss of the sensing structure is sensitive to the external magnetic field, which is utilized for magnetic field sensing. The linear response regions are obtained in the range of 38-225 Oe and 250-475 Oe. For the valley-wavelength-shift-type sensing, the sensitivities are 14.1 pm/Oe and 26 pm/Oe at low and high field ranges, respectively. For the transmission-loss-variation-type sensing, the sensitivity of -0.024 dB/Oe is achieved for the magnetic field strength ranging from 250 to 475 Oe.
提出了一种由围绕一段单模光纤的磁流体组成的磁场传感器。采用了锥形和横向偏移熔接技术。传感原理基于包层模干涉。传感结构的干涉谷波长或传输损耗对外部磁场敏感，可用于磁场传感。在38 - 225 Oe和250 - 475 Oe范围内获得了线性响应区域。对于谷波长位移型传感，在低场和高场范围内的灵敏度分别为14.1 pm/Oe和26 pm/Oe。对于传输损耗变化型传感，在250至475 Oe的磁场强度范围内实现了-0.024 dB/Oe的灵敏度。
