基于分布式光纤测温系统的垃圾填埋场渗漏定位

提出了基于拉曼散射温度效应和光时域反射（OTDR）的分布式光纤测温系统的新型无黏土层填埋场渗漏检测定位方法。对检测光缆进行加热后，由于被垃圾渗滤液浸湿的GCL比热容大于干燥的GCL，使得渗漏位置温升明显小于未渗漏位置。利用拉曼散射光捕捉温度信息，利用光时域反射OTDR准确进行渗漏定位。建立了填埋场渗漏检测的数学模型，并进行了理论推导和实验研究，实测结果证明：模拟的防渗膜破损位置与测量结果高度吻合且最大定位引用误差为0.11%。分布式光纤测温系统可实现对GCL层温度场的变化进行实时、准确的监测，且满足填埋场的长距离、大范围、高腐蚀的特殊要求。

Leakage positioning method of landfill base on distributed optical fiber temperature measurement system

A new method of distributed optical fiber temperature measurement system with the temperature effect of Raman scattering and optical time domain reflection (OTDR) for the detection of leakage from the new type of landfill without clay are proposed in this paper.Because the specific heat capacity of wet GCL is greater than that of the dry GCL after heating of the optical fiber of test,the temperature of the leakage position was apparently lower than that of the non-leakage area.The Raman scattering light was used to obtain temperature information,and the OTDR was used to locate the leakage accurately.In this article,a mathematical model for the detection of landfill leakage was established,and the feasibility of this method was shown by theoretical deduction and experimental study.The experimental results show that the simulation of the impermeable membrane was highly consistent with the measured results,with a maximum positioning reference error of 0.11%.The distributed optical fiber temperature measurement system monitored in real time,the temperature changes of the GCL layer accurately and met the special requirements for landfills of long distance,large range,and high corrosion.