【作者】 余飞；

【导师】 李新碗；

【作者基本信息】 上海交通大学 ， 电磁场与微波技术， 2007， 硕士

【摘要】 与普通机械、电子类传感器相比,光纤传感器具有灵敏度高、动态范围大、使用方便、体积小、重量轻、易于单纤集成以及抗电磁干扰能力强等优点,有着非常大的发展潜力和应用前景。其中,干涉型光纤弱磁传感器和光纤光栅应变传感器是当今两个比较热点的研究方向。本文研究对象就是与这两种光纤传感器相关的技术,主要分析了这两种传感器灵敏度与各自探头机械性能参数的关系,内容如下:1.对基于磁致伸缩材料的光纤干涉型微弱磁传感器探头进行了有限元模态分析,建立了相关数学模型,模拟计算了探头的前40阶固有机械谐振频率。研究表明,其中第32阶谐振频率上探头的灵敏度最高,这一分析结果与实验结果基本一致,验证了所建立的理论模型的有效性。通过对探头的模态分析,可使探头的设计和制作得到优化,为提高系统的灵敏度提供了依据。采用有限元谐响应分析方法计算了在多种磁致伸缩环尺寸和不同缠绕光纤长度条件下光纤磁传感探头的机械形变情况,计算结果表明:增大磁致伸缩环带的外半径和宽度、或者增加粘贴在磁致伸缩环带上的传感光纤长度,均可以使传感探头的最大形变增大,提高换能器的应变灵敏度。2.对基于机械形变的光纤光栅应变传感器建立了探头机械形变更多还原

【Abstract】 Compared with mechanical and electronic sensor, the fiber-optic sensor has had great development with its high sensitivity, large dynamic range, convenience, compactness and so on. Interferometric fiber-optic weak magnetic sensor and fiber grating strain sensor have become the hot topics in the field of research on the fiber-optic sensor technologies.The study target of this dissertation is to analyze the relationships between system sensitivity and mechanical parameters of transducer for the two kinds of sensors mentioned above. The main contents include:Firstly, the interferometric fiber-optic weak magnetic sensor was introduced. A mathematical model was presented to analyze the mechanical performance of the transducer for fiber-optic weak magnetic field sensors using finite element method. The resonant frequencies from the lowest mode up to the fortieth order mode were calculated. It was found that the transducer has the highest sensitivity at the 32nd order resonant frequency, which agrees with the experimental result. This indicates the validity of the model. It provides an effective method for the optimal design and implementation of the transducer, and the system sensitivity can be improved accordingly. The displacements of transducer with different sizes of magnetostrictive rings and different lengths of fiber wrapped on the ring were calculated through harmonic response analysis. The results are that maximum displacement of sensing transducer can be更多还原