Estimation of time-of-arrival errors of acoustic-emission signals by the threshold method

被引：6
|
作者：
Stepanova, L. N. [1 ]
Ramazanov, I. S. [1 ]
Kanifadin, K. V. [1 ]
机构：
[1] Chaplygin Siberian Res Inst Aviat, Novosibirsk 630051, Russia
来源：
RUSSIAN JOURNAL OF NONDESTRUCTIVE TESTING | 2009年 / 45卷 / 04期
关键词：
Linear Approximation; Nondestructive Test; Threshold Method; Signal Envelope; Operation Threshold;
D O I：
10.1134/S1061830909040081
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
A technique for determining the times of arrival of acoustic-emission (AE) signals at the probes of a piezoelectric antenna with simultaneous estimation of their errors is considered. To increase the localization accuracy, it is proposed to refine the times of arrival by linearly approximating the leading edge of an AE signal taking into account the influence of noise. The slope of the leading edge is calculated according to the criterion of the minimum rms deviation from the signal envelope using the moving-window method. Examples of use of the developed method for calculating the coordinates of flaws in strength tests of structural elements are considered.
引用
收藏
页码：273 / 279
页数：7
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