基于偏振特性的光纤扭曲传感研究

发布时间：2018-02-24 08:08

本文关键词： 光纤扭曲传感偏振特性倾斜光纤光栅保偏光纤　出处：《中国计量学院》2015年硕士论文　论文类型：学位论文

【摘要】：由于具有灵敏度高、体积小以及适应苛刻的测量环境等特点,光纤传感器在传感领域具有广泛的应用。本文主要研究基于偏振特性的光纤扭曲传感器,并根据偏振特性设计了光纤扭曲传感器。文章分析了传感原理,制作方法及应用。主要研究内容有:1、介绍了光纤偏振特性的发展过程,并且简要的介绍了利用偏振特性的光纤扭曲传感领域的应用。2、具体分析了保偏光纤和倾斜光纤光栅的偏振特性。倾斜光纤光栅因为破坏了光纤的圆对称性,因此它激发的包层膜具有偏振特性。保偏光纤由于正交轴上的折射率值差别较大而具有偏振保持能力。光纤扭曲会使光纤中的偏振光在不同偏振态之间发生发生变化。3、提出了一种基于TFBG偏振特性的扭曲传感器。该传感器由单模光纤熔接一个长度为1cm且倾角为10o的TFBG组成。实验中,随着光纤扭曲角度的变化而在两个正交方向上(P偏振态和S偏振态)的透射峰中的包层模式呈现类似三角函数的曲线。在-180o到180o的测量范围内,本实验得到的扭曲传感灵敏度为0.299d B/o。在这个实验的基础上,又提出一种基于镀金TFBG的偏振特性的扭曲传感器。在-180o到180o的测量范围内,扭曲传感器的灵敏度可达到0.2958d B/o。4、提出了一种基于保偏光纤偏振特性的扭曲光纤传感器,保偏光纤两端通过熔接机错位熔接普通单模光纤构成马赫曾德干涉结构。当保偏光纤发生扭曲时,快轴(或者慢轴)对应的干涉峰会有周期性变化。分别对在顺时针和逆时针两个方向的扭曲测量,最终在扭曲范围0o-180o内,测量的扭曲最高灵敏度为0.624dB/o·m-1。
[Abstract]:Because of its high sensitivity, small size and adaptability to harsh measurement environment, fiber optic sensor is widely used in sensor field. In this paper, optical fiber twisting sensor based on polarization characteristics is studied. According to the polarization characteristics, the fiber twisting sensor is designed. The sensing principle, fabrication method and application are analyzed in this paper. The main research content is: 1, and the development process of the polarization characteristic of the fiber is introduced. The polarization characteristics of polarization maintaining fiber and tilted fiber grating are analyzed in detail. Therefore, the cladding film excited by it has polarization characteristics. Polarization maintaining fiber has polarization retention ability because of the great difference in refractive index values on orthogonal axis. The distortion of optical fiber will cause polarized light in optical fiber to occur between different polarization states. A twisting sensor based on the polarization characteristics of TFBG is proposed. The sensor is composed of a TFBG with a length of 1 cm and an angle of 10 o. The cladding patterns in the transmission peaks of P polarization and S polarization in two orthogonal directions show a curve similar to trigonometric functions with the variation of the twisted angle of the fiber. In the range of -180o to 180o, The sensitivity of the twisting sensor obtained in this experiment is 0.299dB / o. on the basis of this experiment, a kind of twisting sensor based on the polarization characteristics of gold-plated TFBG is proposed. In the range of -180o to 180o, The sensitivity of the twisting sensor can reach 0.2958 dB / o. 4. A kind of twisting fiber sensor based on polarization characteristics of polarization maintaining fiber is proposed. The two ends of the polarization-maintaining fiber are staggered by the welding machine to weld the common single-mode fiber to form a Mach Zende interference structure. When the polarization maintaining fiber is distorted, The interference summit corresponding to the fast axis (or the slow axis) has periodic variation. The maximum sensitivity of the measurement is 0.624 dB / o 路m ~ (-1) for both clockwise and counterclockwise twisting measurements in the distortion range of 0o-180o.
【学位授予单位】：中国计量学院
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TN253

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