噪声时域反射法实现多根电缆故障的同时检测  

Simultaneous Detection of Multi-Cable Faults Based on Noise Time-Domain Reflectometry

作　　者：马培国 徐航[1,2] 王冰洁[1,2] 武光辉[1,2] 

机构地区：[1]太原理工大学物理与光电工程学院,山西太原030024 [2]新型传感器与智能控制教育部和山西省重点实验室,山西太原030024

出　　处：《激光与光电子学进展》2017年第5期231-238,共8页Laser & Optoelectronics Progress

基　　金：国家自然科学基金青年科学基金(61401299;51404165);山西省自然科学基金(201601D011047)

摘　　要：为了同时检测捆绑成束的电缆以及多芯电缆不同支路上的故障,提出并实验验证了一种多通道噪声时域反射法。该方法利用多路滤波后的放大自发辐射噪声作为电缆束或者多芯电缆不同支路的探测信号,基于相关探测技术,可同时检测不同支路上电缆故障,且没有相互干扰。实验结果表明该方法可以同时检测位于不同电缆支路上的断路、短路和阻抗失配等故障。当URM43型同轴电缆单个支路的噪声探测信号功率为-9.1dBm时,最远探测距离为720m。此外,还进行实验证明了该方法可以实现电缆故障的在线检测。In order to simultaneously detect the cable faults on different branches of the cable bundles and multi-core cables, a multi-channel noise time domain reflectometry is proposed and experimentally demonstrated. Amplified spontaneous emission （ASE） noises after multipath filtering serve as probe signals to detect different branches of cable bundles or multi-core cables. Based on correlation detection technology, the cable faults of different branches are detected simultaneously with no mutual interference. The experimental results indicate that the proposed method can detect open circuits, short circuits and impedance mismatches on different cable branches simultaneously. Moreover, for the single URM43 coaxial cable, a maximum detection range of about 720 m is obtained when the power of the noise detection signal is -- 9.1 dBm. In addition, it is experimentally proved that the proposed method can realize live test of cable fault.

关 键 词：测量 故障检测 多芯电缆 电缆束 噪声时域反射法 放大自发辐射噪声 

分 类 号：TN29[电子电信—物理电子学]