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首页> 外文学位 >Theoretical and experimental analysis of strain transfer rate in coated fiber Bragg grating strain sensors.
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Theoretical and experimental analysis of strain transfer rate in coated fiber Bragg grating strain sensors.

机译：涂覆光纤布拉格光栅应变传感器中应变传递速率的理论和实验分析。

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摘要

Fiber Bragg Grating (FBG) sensors have seen significant development in recent years, especially in the aerospace industry for structural health monitoring due to their versatility and measurement capability. Improvement in sensor's reliability and accuracy, however, continue to be two parameters critical to the eventual implementation of this technology in high value targets and can be enhanced by the effect of both mechanical and optical characteristics of the fiber. This thesis presents an evaluation of the strain transfer capability of different coated FBG strain sensors (i.e. Gold, Polyamide and Acrylic) bonded to metallic host structures. A theoretical relationship for the strain transfer rate from the host structure to the fiber core has been developed. This relationship considers the strain transfer loss through the layers of the system based on their material properties and their geometry. In addition, a simulated analysis using finite element modeling has been developed. Parametric analysis of both the analytical and simulation models revealed the impact of coating material selection, coating thickness selection, and bonding condition on the strain transfer loss. Results illustrate that metallic fiber coatings (i.e. Gold) are more suitable for improved strain transfer than their polymeric counterparts. Additionally a set of experiments were conducted using Acrylic coated FBG sensor bonded to an Aluminium sample to validate the results from theory and the simulation. The strain on the FBG sensor was measured and compared with a calibrated strain gauge mounted on the host structure to characterize the strain transfer loss. The experimental results were compared with the results for the same configuration of the sensor and its host structure, from the theory and simulation and were found to be in good agreement.
机译：近年来，光纤布拉格光栅（FBG）传感器已经取得了长足的发展，特别是在航空航天工业中，由于其多功能性和测量能力，其用于结构健康监测。但是，传感器可靠性和准确性的提高仍然是最终在高价值目标中实现该技术的两个关键参数，并且可以通过光纤的机械和光学特性的影响而得到增强。本文提出了结合到金属主体结构上的不同涂层FBG应变传感器（即金，聚酰胺和丙烯酸）的应变传递能力的评估。已经建立了从主体结构到纤维芯的应变传递速率的理论关系。这种关系根据其材料属性和几何形状来考虑通过系统各层的应变传递损失。另外，已经开发了使用有限元建模的模拟分析。分析模型和模拟模型的参数分析都揭示了涂层材料选择，涂层厚度选择和粘结条件对应变传递损失的影响。结果表明，金属纤维涂层（即金）比其聚合物对应物更适合于改善应变传递。另外，使用粘结到铝样品上的丙烯酸涂层FBG传感器进行了一组实验，以验证理论和模拟的结果。测量FBG传感器上的应变，并将其与安装在主体结构上的校准应变仪进行比较，以表征应变传递损失。从理论和仿真上，将实验结果与相同配置的传感器及其主机结构的结果进行了比较，发现结果吻合良好。

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  • 作者

    Dadpay, Chakameh.;

  • 作者单位

    Concordia University (Canada).;

  • 授予单位 Concordia University (Canada).;
  • 学科 Engineering Mechanical.
  • 学位 M.A.Sc.
  • 年度 2008
  • 页码 97 p.
  • 总页数 97
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 机械、仪表工业;
  • 关键词

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