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An Extrinsic Fabry-Perot Interferometric Sensor using Intermodal Phase Shifting and Demultiplexing of the Propagating Modes in a Few-Mode Fiber

机译:一种外模法布里-珀罗干涉式传感器,在少量模式光纤中使用模态相移和传播模式的解复用

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摘要

This dissertation demonstrates a fiber-optic phase shifted Fabry-Perot interferometer (PS-FPI) as a sensor using modal demultiplexing. Single wavelength Fabry-Perot interferometers suffer from fringe ambiguity and loss of sensitivity at fringe extremes. These hindrances cause it to be a secondary choice when being selected for a measurement task at hand, and more often than not, white light based sensors are selected in favor of the single wavelength Fabry-Perot sensors. This work aims to introduce a technique involving the demultiplexing of the propagating linearly polarized (LP) modes in few mode fibers to obtain two fringe systems from the same sensing cavity. This results in a few-mode interferometer that effectively has two to three orders of magnitude higher perturbation sensitivity than a conventional few mode interferometer for the same sensing region. In this work, two different modal demultiplexing techniques (MD) are used to demodulate the propagating modes and to obtain two fringe sets. These output fringe sets are shifted in phase with respect to each other by a phase shift due to the propagation of the modes in the fiber-optic layout. A method of controlling this phase shift by straining a length of a two mode fiber located separate from the PS-FPI cavity is demonstrated and corresponding changes in phase shifts are shown. The results show a controllable phase shift for both the MD techniques, which is useful in sensing by permitting quadrature demodulation of interferometric fringes and also results in a novel few-mode sensing system having more than two orders of magnitude sensitivity than conventional few-mode devices.
机译:论文证明了采用模态解复用技术的光纤相移法布里-珀罗干涉仪(PS-FPI)作为传感器。单波长法布里-珀罗干涉仪受边缘模糊和边缘极端灵敏度的影响。这些障碍使它成为手头的测量任务时的次要选择,而且通常选择基于白光的传感器来代替单波长Fabry-Perot传感器。这项工作旨在介绍一种技术,该技术涉及在少数模光纤中对传播的线性偏振(LP)模式进行多路分解,以从同一传感腔中获得两个条纹系统。这导致了对于相同的感测区域,与传统的少模干涉仪相比,少模干涉仪实际上具有比传统的少模干涉仪高两到三个数量级的摄动灵敏度。在这项工作中,使用两种不同的模态多路分解技术(MD)来解调传播模式并获得两个条纹集。由于光纤布局中模式的传播,这些输出条纹组彼此之间发生了相移。演示了通过拉紧与PS-FPI腔分开放置的双模光纤的长度来控制此相移的方法,并显示了相移的相应变化。结果表明,两种MD技术的相移都是可控的,这在通过允许干涉条纹的正交解调进行感测中很有用,并且还导致了新颖的少模传感系统,其灵敏度比传统的少模装置高出两个数量级。 。

著录项

  • 作者

    Chatterjee, Julius.;

  • 作者单位

    Florida Institute of Technology.;

  • 授予单位 Florida Institute of Technology.;
  • 学科 Electrical engineering.;Remote sensing.;Mechanical engineering.
  • 学位 Ph.D.
  • 年度 2017
  • 页码 141 p.
  • 总页数 141
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 农学(农艺学);
  • 关键词

  • 入库时间 2022-08-17 11:38:59

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