基于BOTDA的堤坝健康监控的研究 

Research on Dyke Health Monitoring Based on BOTDA

摘要:

针对堤坝坍塌,为避免伤亡和经济损失,需要对堤坝进行健康监控,及时提供预警；通过BOTDA(Brillouin optical time domain analysis)技术,设计并搭建堤坝实验平台,研究用分布式光纤传感器检测不同水流量下堤坝的形变；堤坝实验平台由恒流量装置和堤坝两部分组成,恒流量装置能精准的为堤坝提供所需的水流量,不同的水流量会给堤坝施加不同的压力,堤坝将在不同的水流量下产生相应的变形；将分布式光纤传感器埋入堤坝中,当堤坝发生形变,光纤会随着堤坝的变形而被拉伸,运用BOTDA技术对分布式光纤传感器进行测量分析,可得光纤的布里渊频移得数据,相应地反映了堤坝的变形；研究表明,光纤的布里渊频移能正确反映出堤坝形变,BOTDA技术应用于堤坝健康监控具有良好的监控预警效果。

Abstract:

Aiming at the dyke collapsing, in order to avoid casualties and economic losses, the health monitoring of dyke and the timely warning are needed.Based on the BOTDA technology, through designing and building the experimental platform, to research the deformation of the dyke under different water flow by using the distributed optical fiber sensor.The experimental platform is composed of two parts of the constant flow device and the dyke. The constant flow device can provide accurate water flow to the dyke. The dyke will generate the corresponding deformation under different water flow.The distributed optical fiber sensor is embedded in the dyke, and when the dyke deformation occurs, the distributed optical fiber sensor will be stretched by the deformation of the dyke. The distributed optical fiber sensor can be measured and analyzed by using BOTDA technology. The results testify that the Brillouin frequency shift of the distributed optical fiber sensor can correctly reflect the dyke deformation, and the BOTDA technique is applied to the dyke health monitoring.