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The Use of a Personal Computer to Extract Information from Pulsed Eddy Current Test

Table 1

 

Table 1 The set of five signal voltage amplitudes developed by various conditions in a copper tube of 12.8 mm (0.5 in.) inner diameter and 0.89 mm (0.04 in.) wall

Condition in the Tube  Time (µs)

45  95  120  160

Standard 

47  49  51  39  39

Liftoff 

70  42  79  30  41

Typical tube 

47  49  47  40  39

Header, edge one 

Header, edge two 47 55 46 2 57

47  21  60  133  42

Header, center 

47  36  55  65  51

0.3 mm (0.01 in.) through hole 

47  39  51  41  38

Header center, soldered 

47  39  51  60  57

1.6 mm (0.06 in.) wide 1.3 mm (0.05 in.)
groove on the outside surface 

47  39  50  38  34

[ Back to March 2001 ]

 

Table 2 The set of five signal voltage amplitudes developed by various conditions in simulated aircraft skin consisting of various aluminum plates of varying thickness, some sandwiched together and secured by rivets

Condition in the Plates 

Time (µs)

 

0 45   95  120 160

Standard 1.3 mm (0.05 in.) aluminum plate 

115  107  124  101  117
Liftoff (0.25 mm [0.01 in.])  105  104  111  93  106

Two 1.6 mm (0.06 in.) plates
sandwiched together 

115  95  121  117  85

1.3 mm (0.05 in.) and 0.6 mm (0.02 in.)
plates sandwiched together 

115  107  124  101  117

0.9 mm (0.04 in.) aluminum plate 

115  108  121  55  138

Two 0.8 mm (0.03 in.) plates
sandwiched together 

115  108  128  109  122

Corrosion between 1.6 mm (0.06 in.) plates 

115  99  122  123  91

Two 1.6 mm (0.06 in.) plates sandwiched
together with crack in the lower plate 

115  94  121  125  83

Header center, soldered 

47  39  51  60  57

1.6 mm (0.06 in.) wide 1.3 mm (0.05 in.)
groove on the outside surface 

47  39  50  38  34

[ Back to March 2001 ]

 

 
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