提出一种利用宽带混沌信号检测传输线断点故障的方法,并利用混沌半导体激光器进行了实验验证。该方法利用激光器的非线性产生宽带混沌激光,并光电转换为宽带混沌电信号;将混沌信号分为两路分别作为参考信号和探测信号,通过相关法对比参考信号确定探测信号的回波延时、定位断点。断点定位精度和分辨率取决于回波延时的分辨率。实验结果表明,利用普通的半导体激光器即可实现7.5 cm的分辨率。

This paper proposes a method of faults location for transmission lines by using broadband chaotic signals,which is experimentally demonstrated with a chaotic semiconductor laser. Chaotic signal is obtained by converting the chaotic light from the chaotic laser diode,and divided into two signals,one serving as probe signal and the other serving as reference signal. Faults are located by correlating the echo of probe signal with the reference one. The spatial resolution is determined by the time resolution of correlation curve. Experimental results show that 7.5 cm resolution can be readily achieved by common laser diode.