基于酒精与磁流体填充的单模-空芯-单模光纤结构温度磁场双参数传感器

发布时间：2018-02-20 02:32

本文关键词： 磁流体空芯光纤模间干涉光纤传感　出处：《物理学报》2017年07期 　论文类型：期刊论文

【摘要】：提出了一种基于空芯光纤模间干涉原理的环境温度和磁场双参数传感器,为了使光入射进空芯光纤壁中,将空芯光纤与单模光纤错位熔接,传感部分用毛细玻璃管封装,空芯光纤内外分别填充酒精和磁流体.除了光纤材料的热光效应和热膨胀效应外,环境温度变化会引起两种溶液折射率的变化,而磁场变化仅引起空芯光纤外的磁流体折射率变化.理论计算可知空芯光纤壁中可支持多个模式传输并相互干涉,各模式传输相位对内外溶液折射率变化灵敏程度不同.因此,干涉谱中两个含有不同模式成分的波谷,即波谷1和波谷2,它们的漂移可以作为指示信号,通过建立敏感矩阵可同时解调出周围环境温度与磁场的变化.实验中,在28—58℃范围内,温度传感灵敏度可达-468 pm/℃;在0—169 Oe范围内磁场传感灵敏度可达82 pm/Oe.该传感器具有高灵敏度与高机械强度,并且能够实现温度与磁场的同时测量,有效消除了温度波动对磁场测量信号的干扰.
[Abstract]:A hollow fiber module between the ambient temperature and the magnetic field interference principle of two parameter sensor based on, in order to make the incident light into the hollow fiber wall, hollow core fiber and single mode fiber displacement welding, packaging glass capillary hollow fiber sensing part, and were filled with alcohol and in addition to magnetic fluid. The thermal effect and the thermal expansion effect of fiber materials, environmental temperature variation will cause two kinds of solution refractive index changes, and the change of magnetic field induced magnetic fluid refraction hollow fiber outside the rate of change. The theoretical calculation can support multiple modes of transmission and interference in the hollow fiber wall, the mode of transmission phase rate change of internal and external refractive sensitivity of solution. Therefore, the interference two containing different mode components trough spectrum, namely 1 and 2 trough trough, they drift can be used as the indication signal, through the establishment of sensitivity matrix and solution Change out of the ambient temperature and the magnetic field. In the experiment, at 28 - 58 DEG C, the temperature sensitivity can reach -468 at pm/ DEG C; with high sensitivity and high mechanical strength in 0 - 169 Oe range up to 82 pm/Oe. magnetic field sensing sensitivity of the sensor, and can achieve the measurement of temperature and magnetic field at the same time, can effectively eliminate the the interference temperature fluctuation on the measurement of magnetic field signal.

【作者单位】：东北大学信息科学与工程学院;东北大学流程工业综合自动化国家重点实验室;
【基金】：国家自然科学基金(批准号:61425003,61273059,51607028)资助的课题~~
【分类号】：TN253;TP212

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