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基于光纤微弯损耗的垃圾填埋场渗漏定位研究 被引量:2

RESEARCH OF LEAKAGE POSITIONING METHOD OF LANDFILL BASED ON OPTICAL FIBER MICROBEND LOSS
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摘要 提出了基于光纤微弯损耗原理和光时域反射OTDR技术,针对新型无黏土层危险废物填埋场渗漏检测的定位方法。由于渗漏的垃圾渗滤液会使膨润土防水毯(GCL)膨胀,导致与之紧贴的光纤发生弯曲变形,激光束通过弯曲的光纤会出现光能损耗,通过测量后向瑞利散射光的功率,即可实现对光纤沿程的弯曲情况进行检测,结合光时域反射原理对出现弯曲损耗的故障点进行定位。建立了填埋场渗漏检测的数学模型,利用理论推导和实验研究证实了该方法的可行性。实测结果表明:防渗膜破损位置与测量结果高度吻合,最大定位误差为1.4 m,最大定位引用误差为0.133%。 A new method based on the theory of loss caused by optical fiber bend and optical time domain reflects(OTDR)was proposed for the detection of the leakage of hazardous wastes from the new kind of landfill without clay. GCL could expand due to the landfill leachate,resulting in the bending of the optical fiber that is close to the geosynthetic clay liner(GCL),whose measured value could cause the loss of light energy because some light change from guided modes to radiation mode.Correspondingly,there will be the loss of backward scattered light,whose measured value could be used to detect the bending degree of optical fiber. Furthermore,the fault points caused by bending could be located based on OTDR. The practicability of mathematical model for the detection of landfill leakage is proved by theoretical deduction and experimental research. The results showed that the measurement result highly matched the position of breakage in impermeable membrane with maximum positioning error of 1. 4 m and the maximum positioning reference error was at 0. 133%.
作者 陈亚宇 杨家良 冯子亮 田玉珠 CHEN Ya-yu1 , YANG Jia-liang1 , FENG Zi-liang1 , TIAN Yu-zhu2 (1. College of Mechanical and Electrical Engineering, Hebei University of Engineering, Handan 056038, China; 2. School of Mechanical Engineering, Hebei University of Technology, Tianjin 300132, China)
出处 《环境工程》 CAS CSCD 北大核心 2016年第12期108-112,共5页 Environmental Engineering
基金 河北省高等学校科学技术处资助项目(QN2016089).
关键词 垃圾填埋场 渗漏定位 微弯损耗 光时域反射 landfill leakage location microbend loss optical time domain reflect
作者简介 第一作者:陈亚宇(1984-),男,博士,讲师,主要研究方向为过程检测与控制。121847157@qq.com 通信作者:杨家良(1991-),男,硕士研究生,主要研究方向为过程检测与控制。mrjerryme@163.com
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