Bremer Kort, Weigand Frank, Zheng Yulong, Alwis Lourdes Shanika, Helbig Reinhard, Roth Bernhard
Hannover Centre for Optical Technologies (HOT), Leibniz University Hannover, Hannover 30167, Germany.
Saxon Textile Research Institute (STFI), Chemnitz 09125, Germany.
Sensors (Basel). 2017 Feb 10;17(2):345. doi: 10.3390/s17020345.
Optical fiber-based sensors "embedded" in functionalized carbon structures (FCSs) and textile net structures (TNSs) based on alkaline-resistant glass are introduced for the purpose of structural health monitoring (SHM) of concrete-based structures. The design aims to monitor common SHM parameters such as strain and cracks while at the same time acting as a structural strengthening mechanism. The sensor performances of the two systems are characterized in situ using Mach-Zehnder interferometric (MZI) and optical attenuation measurement techniques, respectively. For this purpose, different FCS samples were subjected to varying elongation using a tensile testing machine by carefully incrementing the applied force, and good correlation between the applied force and measured length change was observed. For crack detection, the functionalized TNSs were embedded into a concrete block which was then exposed to varying load using the three-point flexural test until destruction. Promising results were observed, identifying that the location of the crack can be determined using the conventional optical time domain reflectometry (OTDR) technique. The embedded sensors thus evaluated show the value of the dual achievement of the schemes proposed in obtaining strain/crack measurement while being utilized as strengthening agents as well.
为了对混凝土结构进行结构健康监测（SHM），引入了基于光纤的传感器，这些传感器“嵌入”在功能化碳结构（FCS）和基于耐碱玻璃的纺织网结构（TNS）中。该设计旨在监测应变和裂缝等常见的结构健康监测参数，同时作为一种结构加固机制。分别使用马赫-曾德尔干涉（MZI）和光衰减测量技术对这两种系统的传感器性能进行了现场表征。为此，使用拉伸试验机通过小心增加施加的力，使不同的FCS样品承受不同程度的伸长，并观察到施加的力与测量的长度变化之间具有良好的相关性。对于裂缝检测，将功能化的TNS嵌入混凝土块中，然后使用三点弯曲试验对其施加不同的载荷直至破坏。观察到了有前景的结果，确定可以使用传统的光时域反射仪（OTDR）技术确定裂缝的位置。如此评估的嵌入式传感器显示了所提出方案在实现应变/裂缝测量的同时还用作加固剂这一双重成果的价值。
