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首页> 外文学位 >Modeling and Validation of Performance Limitations for the Optimal Design of Interferometric and Intensity-Modulated Fiber Optic Displacement Sensors.
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Modeling and Validation of Performance Limitations for the Optimal Design of Interferometric and Intensity-Modulated Fiber Optic Displacement Sensors.

机译：干涉测量和强度调制光纤位移传感器优化设计的性能极限建模和验证。

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摘要

Optical fiber sensors offer advantages over traditional electromechanical sensors, making them particularly well-suited for certain measurement applications. Generally speaking, optical fiber sensors respond to a desired measurand through modulation of an optical signal's intensity, phase, or wavelength. Practically, non-contacting fiber optic displacement sensors are limited to intensity-modulated and interferometric (or phase-modulated) methodologies.;Intensity-modulated fiber optic displacement sensors relate target displacement to a power measurement. The simplest intensity-modulated sensor architectures are not robust to environmental and hardware fluctuations, since such variability may cause changes in the measured power level that falsely indicate target displacement. Differential intensity-modulated sensors have been implemented, offering robustness to such intensity fluctuations, and the speed of these sensors is limited only by the combined speed of the photodetection hardware and the data acquisition system (kHz-GHz). The primary disadvantages of intensity-modulated sensing are the relatively low accuracy (mum-mm for low-power sensors) and the lack of robustness, which consequently must be designed, often with great difficulty, into the sensor's architecture. White light interferometric displacement sensors, on the other hand, offer increased accuracy and robustness. Unlike their monochromatic-interferometer counterparts, white light interferometric sensors offer absolute, unambiguous displacement measurements over large displacement ranges (cm for low-power, 5 mW, sources), necessitating no initial calibration, and requiring no environmental or feedback control. The primary disadvantage of white light interferometric displacement sensors is that their utility in dynamic testing scenarios is limited, both by hardware bandwidth and by their inherent high-sensitivity to Doppler-effects.;The decision of whether to use either an intensity-modulated interferometric sensor depends on an appropriate performance function (e.g., desired displacement range, accuracy, robustness, etc.). In this dissertation, the performance limitations of a bundled differential intensity-modulated displacement sensor are analyzed, where the bundling configuration has been designed to optimize performance. The performance limitations of a white light Fabry-Perot displacement sensor are also analyzed. Both these sensors are non-contacting, but they have access to different regions of the performance-space. Further, both these sensors have different degrees of sensitivity to experimental uncertainty. Made in conjunction with careful analysis, the decision of which sensor to deploy need not be an uninformed one.
机译：光纤传感器提供了优于传统机电传感器的优势，使其特别适合于某些测量应用。一般而言，光纤传感器通过调制光信号的强度，相位或波长来对所需的测量值做出响应。实际上，非接触式光纤位移传感器仅限于强度调制和干涉（或相位调制）方法。强度调制光纤位移传感器将目标位移与功率测量联系起来。最简单的强度调制传感器体系结构对于环境和硬件波动并不稳健，因为这种可变性可能会导致测量的功率水平发生变化，从而错误地指示目标位移。已经实现了差分强度调制传感器，为这种强度波动提供了鲁棒性，并且这些传感器的速度仅受光电检测硬件和数据采集系统（kHz-GHz）的组合速度的限制。强度调制感测的主要缺点是相对较低的精度（对于低功率传感器而言为mm）和缺乏鲁棒性，因此必须在设计传感器结构时经常遇到很大困难。另一方面，白光干涉式位移传感器提供更高的精度和耐用性。与单色干涉仪不同，白光干涉传感器在大位移范围（低功率，5 mW，源为cm）上提供绝对，明确的位移测量，无需进行初始校准，也不需要环境或反馈控制。白光干涉式位移传感器的主要缺点是其在动态测试场景中的实用性受到硬件带宽以及它们对多普勒效应的固有高灵敏度的限制。;是否使用强度调制干涉式传感器的决定取决于适当的性能函数（例如，所需的位移范围，精度，鲁棒性等）。本文分析了捆绑式差分强度调制位移传感器的性能局限性，在其中设计了捆绑配置以优化性能。还分析了白光法布里-珀罗位移传感器的性能局限性。这两个传感器都是非接触式的，但是它们可以访问性能空间的不同区域。此外，这两个传感器对实验不确定性具有不同程度的敏感性。结合仔细的分析后，决定采用哪种传感器的决定就不会是一个不明智的决定。

著录项

  • 作者

    Moro, Erik Allan.;

  • 作者单位

    University of California, San Diego.;

  • 授予单位 University of California, San Diego.;
  • 学科 Engineering Electronics and Electrical.;Physics Optics.
  • 学位 Ph.D.
  • 年度 2012
  • 页码 156 p.
  • 总页数 156
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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