Embedded fiber optic sensors for monitoring processing, quality and structural health of resin transfer molded components
Embedded fiber optic sensors for monitoring processing, quality and structural health of resin transfer molded components
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嵌入式光纤传感器，用于监控树脂传递模塑部件的加工、质量和结构健康状况
DOI：
10.1088/1742-6596/305/1/012135
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发表时间：
2011
期刊：
影响因子：
--
通讯作者：
A. Suleman
中科院分区：
文献类型：
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作者：
C. Keulen;B. Rocha;M. Yildiz;A. Suleman
由于光纤尺寸小且具有灵活性，因此可以嵌入复合材料中，对主体材料的强度和可靠性几乎没有负面影响。光纤布拉格光栅 (FBG) 或蚀刻光纤传感器 (EFS) 等光纤传感器可用于检测复合材料部件整个生命周期中的许多相关参数，例如流量、固化程度、质量和结构健康状况。通过检测算法，这些嵌入式传感器可用于在组件仍在使用时实时检测损坏情况。本文介绍了使用光纤传感器对树脂传递模塑 (RTM) 复合结构进行过程和结构健康监测 (SHM) 的研究。光纤传感器用于 RTM 复合板的所有生命阶段。开发了实验室规模的 RTM 设备，能够直观地监控树脂填充过程。还开发了一种在该设备中嵌入光纤传感器的技术。 FBG 和 EFS 均已使用该设备嵌入到复合面板中。用于监控制造过程（特别是树脂流动）的 EFS 已被嵌入，并且能够检测树脂注入模具时各个位置的存在情况。同时，这些传感器与光纤光栅复用在同一光纤上，光纤光栅能够测量应变。由于多个传感器可以在单根光纤上复用，因此每个传感器所需的入口/出口位置的数量可以显着减少。为了表征用于应变检测的 FBG，我们制作了带有嵌入式 FBG 传感器的拉伸测试样本。这些样本已配备电阻应变计以进行基准测试。样本和嵌入式传感器都通过拉伸测试进行表征。此外，FBG 已以有利于检测位于中心的 PZT 产生的兰姆波的方式嵌入复合面板中。由于这些导波的速度高且应变幅度小，为了感测兰姆波，需要高速、高精度的感测技术来从嵌入式光纤光栅获取数据。开发了一种基于由可调谐光纤光栅组成的滤波器的技术。由于该滤波器不依赖于移动部件，因此使用该滤波器执行的测试以检测兰姆波结束，从而消除了温度和操作应变的影响。开发了一种损伤检测算法来检测和定位裂纹和分层。
Due to their small size and flexibility fiber optics can be embedded into composite materials with little negative effect on strength and reliability of the host material. Fiber optic sensors such as Fiber Bragg Gratings (FBG) or Etched Fiber Sensors (EFS) can be used to detect a number of relevant parameters such as flow, degree of cure, quality and structural health throughout the life of a composite component. With a detection algorithm these embedded sensors can be used to detect damage in real time while the component remains in service. This paper presents the research being conducted on the use of fiber optic sensors for process and Structural Health Monitoring (SHM) of Resin Transfer Molded (RTM) composite structures. Fiber optic sensors are used at all life stages of an RTM composite panel. A laboratory scale RTM apparatus was developed with the capability of visually monitoring the resin filling process. A technique for embedding fiber optic sensors with this apparatus has also been developed. Both FBGs and EFSs have been embedded in composite panels using the apparatus. EFSs to monitor the fabrication process, specifically resin flow have been embedded and shown to be capable of detecting the presence of resin at various locations as it is injected into the mold. Simultaneously these sensors were multiplexed on the same fiber with FBGs, which have the ability to measure strain. Since multiple sensors can be multiplexed on a single fiber the number of ingress/egress locations required per sensor can be significantly reduced. To characterize the FBGs for strain detection tensile test specimens with embedded FBG sensors have been produced. These specimens have been instrumented with a resistive strain gauge for benchmarking. Both specimens and embedded sensors were characterized through tensile testing. Furthermore FBGs have been embedded into composite panels in a manner that is conducive to detection of Lamb waves generated with a centrally located PZT. To sense Lamb waves a high speed, high precision sensing technique is required to acquire data from embedded FBGs due to the high velocities and small strain amplitudes of these guided waves. A technique based on a filter consisting of a tunable FBG was developed. Since this filter is not dependant on moving parts, tests executed with this filter concluded with the detection of Lamb waves, removing the influence of temperature and operational strains. A damage detection algorithm was developed to detect and localize cracks and delaminations.
DOI：
10.1098/rspa.2007.1834
发表时间：
2007-06
期刊：
Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences
影响因子：
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作者：
K. Worden;C. Farrar;G. Manson;G. Park
通讯作者：
K. Worden;C. Farrar;G. Manson;G. Park