分布式光纤传感技术在裂缝检测中的应用

Application of Distributed Optical Fiber Sensing Technique to Detection of Cracks in Concrete

为了解决土木工程结构中裂缝检测的难题,可以通过在结构中埋入分布式光纤传感器实现.基于分布式光纤传感技术检测裂缝的原理,讨论了光纤的布置方式,并通过模型实验探讨了光衰减与裂缝宽度的关系,获得了相应的经验公式.此外,还探讨了施工中光纤的保护方法及其在结构中的可靠性和长期稳定性.

To overcome the difficulty in the detection of cracks in concrete, distributed optical fiber sensors can be preembedded in structures. Based on the principle of crack detection using distributed optical fiber sensing technique, the layout of optical fiber was discussed, the relationship between light attenuation and crack width was investigated through tests in laboratory, and a semiempirical formula for light attenuation and crack width was obtained. In addition, the measures of optical fiber sensor protecting in construction and their longterm stability and reliability in structures were discussed.