|
ACFM
in Detail
ACFM vs Eddy
Current
TABLE 2 - SUMMARY OF DIFFERENCES BETWEEN ACFM AND EDDY CURRENT
| |
ACFM |
EDDY CURRENTS |
| Crack Depth Measurement without Calibration |
Yes |
No |
| Maximum Depth * |
about 30 mm |
about 5 mm |
| Crack Length Measurement |
Yes |
Yes |
| Crack Detection and Location |
Yes |
Yes |
| Signal Variations due to Lift-off |
Low (Bx only) |
High |
| Easy deployment in transition region (eg Weld) |
Yes |
No |
Easy to automate probe scanning
|
Yes |
No |
* N.B. Depth is the distance
down a crack face from a metal surface to the crack tip - not the
distance from the metal surface to a buried defect.
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