The principle of applying this technique to obliterated serial number recovery is shown in
Figure 2. In this instance, the initial state of the sample includes an indentation of a serial
number with the resultant sub-surface material deformation. The visible indentation is removed
during the obliteration, but the deformed material remains. The part is then flooded with
magnetic fines and magnetized, as in the previous example. Assuming that the deformation
causes enough of a localized change in the magnetic properties of the material, the site of the
deformation can cause magnetic flux to leak out and attract particles. Because the nature of this
discontinuity is more subtle than, say, a crack, the implementation of this approach for forensic
work is less forgiving than its usage for simple flaw detection
The principle of applying this technique to obliterated serial number recovery is shown inFigure 2. In this instance, the initial state of the sample includes an indentation of a serialnumber with the resultant sub-surface material deformation. The visible indentation is removedduring the obliteration, but the deformed material remains. The part is then flooded withmagnetic fines and magnetized, as in the previous example. Assuming that the deformationcauses enough of a localized change in the magnetic properties of the material, the site of thedeformation can cause magnetic flux to leak out and attract particles. Because the nature of thisdiscontinuity is more subtle than, say, a crack, the implementation of this approach for forensicwork is less forgiving than its usage for simple flaw detection
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