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Publication Citation: Topography measurements for correlations of standard cartridge cases

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Author(s): Theodore V. Vorburger; Jun-Feng Song; Wei Chu; Thomas B. Renegar; Xiaoyu A. Zheng; James H. Yen; Robert M. Thompson; Richard M. Silver; Benjamin Bachrach; Martin Ols;
Title: Topography measurements for correlations of standard cartridge cases
Published: July 01, 2010
Abstract: NIST Standard Reference Materials (SRM) 2460 Standard Bullets and 2461 Standard Cartridge Cases are intended for use as check standards for crime laboratories to help verify that their computerized optical imaging equipment for ballistics image acquisitions and correlations is operating properly. Using topography measurements and cross-correlation methods, our earlier results for the SRM bullets and recent results for the SRM cartridge cases both demonstrate that the individual units of the SRMs are highly reproducible. Currently, we are developing procedures for topographic imaging of the firing pin impressions, breech face impressions, and ejector marks of the standard cartridge cases. The initial results lead us to conclude that all three areas can be measured accurately and routinely using confocal techniques. We are also nearing conclusion of a project with crime lab experts to test sets of both SRM cartridge cases and SRM bullets using the automated commercial systems of the NIBIN project.
Conference: SPIE Proceedings 7729
Proceedings: SPIE Scanning Microscopy
Volume: 7729
Location: Monterey, CA
Dates: May 17-19, 2010
Keywords: Forensic science, ballistics identification, standard bullet, standard casing, topography measurement, confocal
Research Areas: Standard Reference Materials, Ballistics, Forensics
PDF version: PDF Document Click here to retrieve PDF version of paper (8MB)