基于主动加热方法的隧道积水分布式光纤传感器  

Distributed optical fiber sensor for tunnel waterlogging based on actively heated method

作　　者：方忠强 王皓宇 胡慧江 张坤 任康 张丹 FANG Zhong-qiang;WANG Hao-yu;HU Hui-jiang;ZHANG Kun;REN Kang;ZHANG Dan(China Design Group,Research and Development Center of Transport Industry of Technologies and Equipments for Intelligent Design,Construction and Maintenance of Underwater Tunnel,Ministry of Transport,Nanjing 210014,China;School of Earth Science and Engineering,Nanjing University,Nanjing 210023,China)

机构地区：[1]水下隧道智能设计、建造与养护技术与装备交通运输行业研发中心(华设设计集团股份有限公司),江苏南京210014 [2]南京大学地球科学与工程学院,江苏南京210023

出　　处：《激光与红外》2024年第3期473-480,共8页Laser & Infrared

基　　金：江苏省战略新兴产业发展专项资金项目;江苏省“六大人才高峰”高层次人才A类项目(No.XNY-002)资助。

摘　　要：针对目前隧道积水事件及积水范围监测需求,研发了两种新型隧道积水传感器,提出了基于分布式温度传感(DTS)的隧道积水分布式感测方法。通过将传感光缆按二维平面螺旋封装方式提高了传感器的空间分辨率,利用主动加热方法,显著提高了水-气界面传感光缆的温度差异,进而实现对积水事件和积水范围的识别。通过室内模型试验,对传感光缆的性能及影响因素进行了研究。结果表明,研发的两种传感器均具有较高的空间分辨率,由于螺旋Ⅰ型的环间距更小,其空间分辨率及定位精度均高于螺旋Ⅱ型;在多种典型工况下两种传感器均可以准确识别积水的水-气界面,定位误差均小于10cm;适当增大加热温度可以提高传感器的定位精度,50℃加热工况时的定位精度明显优于35℃和20℃。In response to the current demand for monitoring the waterlogging events and the extent of waterlogging in tunnels,two new types of tunnel waterlogging sensors are developed,and a distributed sensing method for tunnel waterlogging based on distributed temperature sensing(DTS)is proposed in this paper.Firstly,the spatial resolution of the sensor is improved by encapsulating the optical sensing cable in a two dimensional plane spiral pattern and an actively heated method is used to significantly improve the temperature difference of the optical sensing cable at the water air interface,thereby realizing the identification of the events and range of tunnel waterlogging.Then,through the indoor model tests,the performance and influencing factors of the optical sensing cable are studied.The results show that the two sensors developed have higher spatial resolution.Due to the smaller spacing of the spiral circle,the spatial resolution and positioning accuracy of the spiral type I sensor are higher than those of the spiral type II sensor.Both sensors can accurately identify the water air interface under various typical working conditions,and their positioning errors are less than 10cm.The positioning accuracy of the sensors can be improved by appropriately increasing the heating temperature,and the positioning accuracy under the heating conditions of 50℃is significantly better than 35℃and 20℃.

关 键 词：隧道 积水 DTS 光纤传感 主动加热方法 

分 类 号：TP212.4*4[自动化与计算机技术—检测技术与自动化装置] TN29[自动化与计算机技术—控制科学与工程]