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The restoration of obliterated stamped serial numbers by ultrasonically induced cavitation in waterSeventeen out of 21 obliterated stamped serial numbers on test specimens of copper, brass, steel, and aluminum were successfully restored. Cavitation induced in water by a piezoelectric transducer was the mechanism used. Primarily, smeared metal was removed from the number grooves by the force of the cavitation, however, numbers were also restored at depths at or below the level of the stamped grooves. The feasibility of this technique as a low cost tool for crime laboratories has been clearly demonstrated. The technique is applicable to a variety of materials, and no previous surface or chemical treatments are necessary.
Document ID
19730019134
Document Type
Technical Memorandum (TM)
Authors
Young, S. G.
(NASA Lewis Research Center Cleveland, OH, United States)
Date Acquired
September 2, 2013
Publication Date
January 1, 1973
Subject Category
General
Report/Patent Number
E-7534
NASA-TM-X-68257
Meeting Information
Meeting: Semiann. Seminar on the Calif. Assoc. of Criminalists
Location: Palo Alto, CA
Country: United States
Start Date: October 17, 1973
End Date: October 19, 1973
Accession Number
73N27866
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
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