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光纤传感技术由于能实现空间立体监测和连续性监测,是目前裂缝监测领域研究的重点。本文在深入研究布里渊传感原理基础上,基于光纤传感器精巧、纤细难于适用于混凝土粗放施工的特点,采用基于FRP封装的分布式光纤传感器,对这种传感器在在用桥梁及在建桥梁的敷设方式、对混凝土裂缝从萌生到开展过程的监测响应及裂缝宽度与布里渊频移之间的规律展开了探索性科学研究。并在试验中加入了光纤光栅传感器,研究光纤光栅传感器对分布式光纤传感器的补充作用。通过理论及试验研究,采用FRP封装的分布式光纤传感器适用于在用及在建桥梁的混凝土裂缝监测,光纤传感器对裂缝的开展有很好的感知性能,初步得到了裂缝宽度与布里渊频移之间的规律。光纤光栅传感器与分布式光纤传感器相结合可以实现长距离与局部高精度的互补作用。
Optical fiber sensing technology can achieve spatial three-dimensional monitoring and continuity monitoring, is the focus of research in the field of fracture monitoring. Based on the deep research of the principle of Brillouin sensing, based on the characteristics of the compact and slim fiber optic sensor, which is difficult to apply to the extensive construction of concrete, a distributed optical fiber sensor based on FRP package is used. Of the laying of the concrete crack initiation and development process to monitor the response and the crack width and Brillouin frequency shift between the conduct of exploratory scientific research. Fiber grating sensor was added into the experiment to study the complementary effect of FBG sensor to distributed optical fiber sensor. Through theoretical and experimental research, the distributed optical fiber sensor with FRP package is suitable for the monitoring of concrete cracks in used and under-built bridges. The optical fiber sensor has good sensing performance for the crack initiation. The crack width and Brillouin frequency Move between the laws. The combination of fiber grating sensor and distributed optical fiber sensor can realize the complementary effect of long distance and local high precision.