The Effects of Lift-Off from Wall Thinning Signal in Pulsed Eddy Current Testing

被引：12

作者：

Park, Duck-Gun ^{[1
]}

Angani, C. S. ^{[2
]}

Kishore, M. B. ^{[1
,3
]}

Kim, C. G. ^{[3
]}

Lee, D. H. ^{[1
]}

机构：

[1] Korea Atom Energy Res Inst, Nucl Mat Res Div, Taejon 305600, South Korea

[2] Indira Gandhi Ctr Atom Res, Kalpakkam 603102, Tamil Nadu, India

[3] Chungnam Natl Univ, Dept Mat Sci & Engn, Taejon 305764, South Korea

来源：

JOURNAL OF MAGNETICS | 2012年 / 17卷 / 04期

关键词：

NDT; pulsed eddy current; lift-off effect; wall thinning; pipeline;

D O I：

10.4283/JMAG.2012.17.4.298

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

In order to know the effect of surface irregularity in the detection of local wall thinning of pipeline using pulsed eddy current (PEC), the lift-off effects on PEC signal have been investigated. Three kinds of parameters in the PEC signal, which is "peak amplitude", "time to peak amplitude" and "time to zero crossing" are analyzed to separate the lift-off effects in the PEC signal. The distance from sensor to the bottom of sample which is the total thickness of combined insulator and sample is kept constant. The magnitude of the differential peak amplitude is increased with increasing sample thickness, the time to peak amplitude is increased with increasing the sample thickness. To determine the effect of lift-off, a number of balanced transient responses combining wall thinning locations and lift-off distances were plotted.

引用

页码：298 / 301

页数：4

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