保偏光纤应力传感及保偏光纤萨格奈克干涉仪研究

发布时间：2018-01-19 09:14

本文关键词： 光纤传感器保偏光纤保偏光纤萨格奈克干涉仪应力传感　出处：《北京交通大学》2017年硕士论文　论文类型：学位论文

【摘要】：保偏光纤在光纤通信传感领域有着广泛的运用,它既可以当做传输元件,也可以成为传感元件;作为传输元件,它表现出良好的偏振保持能力;作为传感元件,它广泛运用于分布式应力传感器、光纤陀螺仪、光纤电流互感器等光纤传感领域,研究它的传输、传感特性有着重要的意义;本文研究了外应力作用下,保偏光纤的应力传感特性和保偏光纤萨格奈克干涉仪的稳定性;本文的研究成果和创新点总结如下(1)从弹性力学出发,求解了侧应力作用下,光纤横截面的应力分布,并根据弹光效应得到其折射率分布,进一步得出应力与光纤双折射的数值关系;(2)考虑保偏光纤固有双折射大,外应力的坐标系与固有双折射的坐标系不一致,通过求取折射率矩阵的对角矩阵,得到外应力与保偏光纤拍长、双折射轴向的数值关系;(3)自制挤压机构,完成保偏光纤应力传感实验,可以测量应力大小和方向;(4)将以上理论用于推导外应力干扰时,保偏光纤萨格奈克干涉仪的输出信号,分析了保偏光纤抗干扰性能,并通过实验验证
[Abstract]:Polarization-maintaining fiber (PMF) is widely used in the field of optical fiber communication sensing. It can be used as both a transmission element and a sensing element. As a transmission element, it shows good polarization retention ability. As a sensing element, it is widely used in the field of distributed stress sensors, fiber optic gyroscopes, optical fiber current transformers and other optical fiber sensors. It is of great significance to study its transmission and sensing characteristics. In this paper, the stress sensing characteristics of polarization-maintaining fiber and the stability of the polarization-maintaining fiber Sager Naik interferometer are studied under the action of external stress. The results and innovations of this paper are summarized as follows: 1) based on the elastic mechanics, the stress distribution of the fiber cross section under lateral stress is solved, and the refractive index distribution is obtained according to the elasto-optical effect. The numerical relationship between stress and fiber birefringence is obtained. 2) considering the inherent birefringence of polarization maintaining fiber, the coordinate system of external stress and inherent birefringence is inconsistent, and the external stress and beat length of polarization maintaining fiber are obtained by obtaining the diagonal matrix of refractive index matrix. The numerical relation of birefringence axis; (3) Self-made extrusion mechanism, which can measure the magnitude and direction of stress, through the experiment of polarization-maintaining fiber stress sensing. 4) applying the above theory to deduce the external stress interference, the output signal of the polarization maintaining fiber Sager Naik interferometer is analyzed, and the anti-interference performance of the polarization maintaining fiber is analyzed.
【学位授予单位】：北京交通大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TN253

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