Authors: L.S. Chumbley, S. Zhang, M. Morris
Abstract:
This project developed a portable prototype instrument that
provides forensic examiners with the ability to characterize a tool-marked
surface, compare the data from that surface to data files obtained from any
other surface, and assess the likelihood that the two surfaces were made by
using the same tool.
Acquisition of data is conducted using a system based on a
portable 3-D optical profilometer manufactured by Alicona, GmbH. Comparison of
resulting data files is done objectively using software algorithms developed
and tested by researchers at Ames Laboratory/Iowa State University.
Small size permits portability to crime scenes when
necessary. The software package used for analysis is called "Mantis."
It is designed to be user friendly and uses open-source software code to allow
for continued research and expansion. Currently, an examiner can use the system
to compare all types of tool-marked surfaces, obtain objective statistical
evaluation of data files, and clarify factors that existed when certain types
of tool marks were made.
To date, the system has been successfully tested on data
sets consisting of fully striated marks created from 50 sequentially
manufactured screwdrivers, quasi- striated markings produced by 50 sequentially
manufactured shear-cut pliers, and impression marks produced by 50 sequentially
manufactured cold chisels.
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