Department of Material Science and Engineering, Ghent University, Sint-Pietersnieuwstraat 41, 9000 Ghent, Belgium.
Sensors (Basel). 2011;11(1):384-408. doi: 10.3390/s110100384. Epub 2010 Dec 31.
Embedded optical fibre sensors are considered for structural health monitoring purposes in numerous applications. In fibre reinforced plastics, embedded fibre Bragg gratings are found to be one of the most popular and reliable solutions for strain monitoring. Despite of their growing popularity, users should keep in mind their shortcomings, many of which are associated with the embedding process. This review paper starts with an overview of some of the technical issues to be considered when embedding fibre optics in fibrous composite materials. Next, a monitoring scheme is introduced which shows the different steps necessary to relate the output of an embedded FBG to the strain of the structure in which it is embedded. Each step of the process has already been addressed separately in literature without considering the complete cycle, from embedding of the sensor to the internal strain measurement of the structure. This review paper summarizes the work reported in literature and tries to fit it into the big picture of internal strain measurements with embedded fibre Bragg gratings. The last part of the paper focuses on temperature compensation methods which should not be ignored in terms of in-situ measurement of strains with fibre Bragg gratings. Throughout the paper criticism is given where appropriate, which should be regarded as opportunities for future research.
嵌入式光纤传感器在许多应用中被认为是用于结构健康监测的。在纤维增强塑料中，嵌入式光纤布拉格光栅被发现是应变监测的最受欢迎和最可靠的解决方案之一。尽管它们越来越受欢迎，但用户应该记住它们的缺点，其中许多缺点与嵌入过程有关。本文首先概述了在纤维复合材料中嵌入光纤时需要考虑的一些技术问题。接下来，介绍了一种监测方案，展示了将嵌入式 FBG 的输出与其中嵌入的结构的应变相关联所需的不同步骤。该过程的每个步骤都已经在文献中单独讨论过，而没有考虑从传感器嵌入到结构内部应变测量的完整周期。本文总结了文献中的工作，并试图将其纳入嵌入式光纤布拉格光栅内部应变测量的整体情况。本文的最后一部分侧重于温度补偿方法，在使用光纤布拉格光栅进行应变的现场测量时，这些方法不容忽视。在整篇文章中，在适当的地方给出了批评，这应该被视为未来研究的机会。
