发明名称 |
EDDY CURRENT IMAGING SYSTEM |
摘要 |
An eddy current imaging system includes an eddy current sensing coil positioned proximate a workpiece for scanning the workpiece to produce a signal indicative of the integrity of the workpiece for regions in an x,y array of data. Such a signal may be a complex impedance signal representative of the amplitude and/or the phase of the signal. Two data processing techniques are disclosed for enhancing the display of a flay in the workpiece. The first includes the step of calculating a spatial derivative of the amplitude and/or phase indicative signal from the coil and providing an image of the spatial derivative to produce a C scan of the spatial derivative. The second includes the steps of determining the regions of maximum ascent and/or descent of the signal for regions in the scan and calculating an impedance plane trajectory from the data array of path points for displaying a reconstructed optimum signal independent of path pattern. |
申请公布号 |
WO9200520(A3) |
申请公布日期 |
1992.03.19 |
申请号 |
WO1991US02173 |
申请日期 |
1991.04.01 |
申请人 |
ABB AMDATA INC. |
发明人 |
LAREAU, JOHN, P.;LEONARD, DAVID |
分类号 |
G01N27/90 |
主分类号 |
G01N27/90 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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