小波去噪和混沌理論應用于輸電線缺陷檢測-計算機工程與應用

224 2012 ，48 (5) Computer Engineering and Applications 計算機工程與應用

小波去噪和混沌理論應用于輸電線缺陷檢測

1，2 1 1，2 1 1，2

林善明 ，孫海華 ，金紀東 ，胡萬清 ，朱昌平

1，2 1 1，2 1 1，2

LIN Shanming , SUN Haihua , JIN Jidong , HU Wanqing , ZHU Changping

1.河海大學 計算機與信息學院，江蘇 常州 213022

2.江蘇省輸配電裝備技術重點實驗室，江蘇 常州 213022

1.College of Computer and Information, Hohai University, Changzhou, Jiangsu 213022, China

2.Jiangsu Key Laboratory of Power Transmission and Distribution Equipment Technology, Changzhou, Jiangsu 213022, China

LIN Shanming, SUN Haihua, JIN Jidong, et al. Wavelet de-noising and chaos theory applied in transmission line defect detect-

ing. Computer Engineering and Applications, 2012, 48 (5 )：224-227.

Abstract ：To solve the problem of echo signal which is very weak, the Duffing equation and the theory of wavelet are studied. The sig-

nal will be annihilated by strong electromagnetic noises when detecting defects in high voltage transmission lines using Electro-Magnet-

ic Acoustic Transducer (EMAT ). A new chaos weak signal detecting system which is combined with the technology of wavelet de-nois-

ing is designed. MATLAB/Simulink is used to simulate the new detecting system. The experimental result shows that the system can de-

tect the useful ultrasound signal under the background of strong electromagnetic noise more effectively, and it can cut down the detect-

ing signal-to-noise ratio of system further. The detecting capability of new system is improved.

Key words ：Electro-Magnetic Acoustic Transducer (EMAT ); chaos theory; weak signal detecting; technology of wavelet de-noising;

MATLAB/Simulink

摘 要：為了解決在利用電磁超聲檢測高壓輸電線路缺陷時，回波信號微弱且易被強大的電磁噪聲覆蓋而難以提取的問題。認

真研究了Duffing 方程和小波理論。將小波去噪技術和混沌理論結合起來，設計了一種新型微弱信號檢測系統。利用MATLAB/

Simulink對系統進行了仿真。實驗結果證明，此系統能有效檢測強電磁背景下的超聲信號，進一步降低了系統的輸出信噪比，提

高了檢測性能。

關鍵詞：電磁超聲；混沌理論；微弱信號檢測；小波去噪技術；MATLAB/Simulink

DOI ：10.3778/j.issn. 1002-8331.2012.05.065 文章編號：1002-83

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