感应式埋地金属缆线寻踪系统的性能测试  

Performance Testing of Inductive Tracing System for Buried Metallic Cables

作　　者：刘存跃[1] 董永贵[1] 侯汝舜[1] 

机构地区：[1]清华大学精密仪器与机械学系,精密测试技术及仪器国家重点实验室,北京100084

出　　处：《仪表技术与传感器》2011年第6期89-92,共4页Instrument Technique and Sensor

基　　金：国家自然科学基金资助项目(60971007);精密测试技术及仪器国家重点实验室自主研究基金资助项目

摘　　要：将33 kHz交流信号耦合到待测金属缆线的一端,利用探测线圈与电容构成的并联谐振电路探测电磁辐射信号的空间变化情况,通过测量放大和滤波后输出信号的峰峰值,实现埋地金属缆线的寻踪与故障定位。分别测试了塑料板、铁板、铝板等不同障碍物对探测信号的影响,并用沙土和混凝土砖块进行了实际工况的模拟测试。实验结果表明:这种探测方式对于干燥沙土埋藏下的电缆具有较好的探测效果,沙土的含水率则会对探测效果产生不利影响。The 33 kHz pulse was coupled to one port of the cable to be traced.The spatial variation of electromagnetic radiation was detected by the parallel resonant circuit composed by the searching coil and a capacitance.The peak-peak amplitude of the amplified and filtered output signal was measured to trace the cable and locate the position of broken point.The influences of different blocking objects,i.e.a plastic,an iron and an aluminum plate,were tested respectively.Moreover,simulated experiments of practical testing were carried out by sandy soil and a concrete block.The results indicate that such a detection method works well for cables buried under dry sandy soil.However,the moisture content of the sandy soil will cause unfavorable effect to the testing performance.

关 键 词：电缆探测 电磁感应 并联谐振 定位 含水率 

分 类 号：TP212.9[自动化与计算机技术—检测技术与自动化装置]