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Development of a dynamic strain distributed fiber optic sensor.

机译：动态应变分布式光纤传感器的开发。

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摘要

In the 1990's, most of the research in the area of distributed fiber optic sensing focused on increasing the overall sensing length and improving spatial resolution. For applications like civil structural monitoring and aerospace vehicle sensing, current centimeter resolutions and kilometer ranges yield much useful information but lack the acquisition speed to produce dynamic strain. The time it takes to make a typical measurement using current Brillouin technology is several minutes and hence the results are instantaneous but not instantly available, rendering them not useful for dynamic measurements.; This thesis provides a method for reducing the measurement time, while at the same time maintaining the range characteristics of previous studies. The testing procedure entails covering the entire strain profile of the fiber in one measurement by sending multiple equally spaced wavelengths in the form of a frequency domain comb over a short time interval. This was accomplished by carefully controlling the signal bandwidth, pulse width and using coherent heterodyne detection for the first time for a two laser Brillouin sensing system.; The Mathematical formulation and simulation model of Brillouin interaction was first developed in Matlab. Temperature and Strain experiments were performed using the direct detection stepped frequency Brillouin Optical Time Domain Analysis (BOTDA) sensor system as well as the new Coherent Parallel Receiver (CPR) configuration. The CPR results showed the expected sinusoidal strain profile for a 12 s periodic strain cycle. The strain distribution for the entire fiber was obtained in 128 mus, thereby demonstrating for first time the potential to measure dynamic strains up to 3.9 kHz.
机译：在1990年代，分布式光纤传感领域的大多数研究都集中在增加整体传感长度和提高空间分辨率上。对于诸如民用结构监测和航空航天车辆传感之类的应用，当前的厘米分辨率和公里范围会产生许多有用的信息，但缺乏产生动态应变的采集速度。使用当前的布里渊（Brillouin）技术进行典型测量所花费的时间为几分钟，因此结果是瞬时的，但不是立即可用的，这对动态测量没有用。本文提供了一种减少测量时间的方法，同时又保持了先前研究的范围特性。测试过程需要通过在短时间间隔内以频域梳的形式发送多个等间隔的波长，从而在一次测量中覆盖光纤的整个应变曲线。这是通过仔细控制信号带宽，脉冲宽度并首次使用两激光布里渊传感系统进行相干外差检测来实现的。布里渊相互作用的数学公式和仿真模型最早是在Matlab中开发的。使用直接检测步进频率布里渊光时域分析（BOTDA）传感器系统以及新的相干并行接收器（CPR）配置进行了温度和应变实验。 CPR结果显示了在12 s的周期性应变周期中预期的正弦应变曲线。整个光纤的应变分布在128亩内获得，从而首次证明了测量高达3.9 kHz的动态应变的潜力。

著录项

  • 作者

    Chaube, Prabodh Kumar.;

  • 作者单位

    University of New Brunswick (Canada).;

  • 授予单位 University of New Brunswick (Canada).;
  • 学科 Engineering Electronics and Electrical.
  • 学位 M.Sc.E.
  • 年度 2005
  • 页码 105 p.
  • 总页数 105
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 无线电电子学、电信技术;
  • 关键词

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