Time-frequency analysis of a pressure wave caused by impulse tree using wavelet transform

被引：1

作者：

Kadowaki, K ^{[1
]}

Nishimoto, S ^{[1
]}

Kitani, I ^{[1
]}

机构：

[1] Ehime Univ, Matsuyama, Ehime 790, Japan

来源：

ELECTRICAL ENGINEERING IN JAPAN | 2003年 / 142卷 / 01期

关键词：

wavelet transform; pressure wave; tree; time-frequency analysis; polyethylene;

D O I：

10.1002/eej.10097

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

This paper describes results of time-frequency analysis of a pressure wave caused by impulse tree extension using wavelet transform. Pressure waves were measured by a piezo sensor which was located on the back of the plane electrode when high-voltage nanosecond pulses were applied to a point electrode in a low-density polyethylene block. Frequency of the pressure wave from induced charges on the plane electrode was higher than that of the pressure wave from tree. In addition, the frequency of the pressure wave from tree tended to decrease with increasing gap length because of the dispersion of the pressure wave during its propagation. When a large tree extension occurred between a 5-mm gap, pressure waves of about 10 MHz propagated from the tree tip and a pressure wave of ` MHz propagated from the tree stem. (C) 2002 Wiley Periodicals, Inc.

引用

页码：1 / 7

页数：7