Abstract
We experimentally demonstrate a time-domain reflectometry (TDR) method for detecting cable faults, which employs a Boolean circuit to generate a wideband chaotic waveform acting as probe signal and further locates faults by correlating a duplicate of the probe signal and the back-reflected signal. The Boolean circuit is a small delayed-feedback system mainly consisting of two exclusive-OR (XOR) gates and one exclusive-NOR gate. Benefiting from fast response and high operating voltage of logical gates, the Boolean circuit can achieve a high-bandwidth and large-amplitude output which cause a high resolution and a long measurable distance for the TDR. Our experimental results show that a 2 km detection distance of a breakpoint and a \(\sim \)0.1 m spatial resolution can be achieved by means of a chaotic signal from the Boolean circuit with 533 MHz bandwidth and 2.5 V amplitude. Furthermore, we experimentally demonstrate the detection of short circuits and impedance mismatches can be successfully implemented using our method.
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