Application of a Weak Signal Processing Method on Cable Non-destructive Testing

3rd International Symposium on Resource Exploration and Environmental Science

生态环境科学

Sun, Jie^1 ; Zhu, Fei^1 ; Sun, Wen^1

Jiangsu Fasten Material Analysis and Testing Co. Ltd, Jiangsu, China^1

关键词: Non destructive testing;    Real signals;    Signal noise;    Signal sequence;    Time domain;    Timing control;    Weak signal processing;    Weak signals;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/300/4/042019/pdf
DOI  :  10.1088/1755-1315/300/4/042019

学科分类：环境科学（综合）

来源: IOP

【 摘 要 】

A weak signal processing method is used to distinguish the defect signal while signal-to-noise ratio is small, and the application in cable non-destructive testing so that can find the tiny defects in the cables. For the signal noise obeys the normal distribution in time domain which is symmetrically distributed on both sides of the real value. The signal noise could cancel each other after accumulating. while the real signal does not obey the normal distribution and could be amplified after time accumulating. A weak signal processing method is designed to collect weak signals multiple times under timing control, and accumulate the collected signal sequence strictly according to the time line. The accumulation of weak signals could effectively amplify the real signal without amplifying the noise, so that the weak signal generated by the tiny defects could be clearly distinguished. The application of weak signal processing method could greatly improve the accuracy of cable non-destructive testing.