Cable Defect Detection Based on Terahertz Time-Domain Spectroscopy Technology

Cables have good insulation performance, small footprint, and high transmission safety, making them an important component of China's power transmission and transformation system. If cables are damaged or broken due to certain factors, it often leads to power outages in a certain area. Therefore, analyzing the causes of cable faults and making accurate judgments can accelerate the monitoring and prevention of faults, and reduce open circuit losses. The use of terahertz technology can perform non-destructive testing on the interior of cables, but the direct imaging results of terahertz systems have problems such as large size, unclear, poor quality, low contrast, and noise. In this article, wavelet denoising is used to process the image, and the results show that wavelet denoising can effectively remove noise and improve image contrast. Terahertz technology can provide a new approach for cable defect detection and improve the accuracy of defect detection.