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Publication Citation: Correlation of Topography Measurements of NIST SRM 2460 Standard Bullets by Four Techniques

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Author(s): Jun-Feng Song; Theodore V. Vorburger; Thomas B. Renegar; Xiaoyu A. Zheng; Hyug-Gyo Rhee; John M. Libert; Li Ma; K Bogart; Susan M. Ballou; B Bachrach;
Title: Correlation of Topography Measurements of NIST SRM 2460 Standard Bullets by Four Techniques
Published: January 01, 2006
Abstract: Three optical instruments including an interferometric microscope, a Nipkow disk confocal microscope and a laser scanning confocal microscope are used for the measurements of bullet profile signatures of a National Institute of Standards and Technology (NIST) Standard Reference Material (SRM) 2460 standard bullet.  The 2D profile signatures are compared with the virtual bullet standard signature established by a stylus-based measurement system at NIST.  The bullet signature differences are quantified by the maximum cross-correlation function CCFmax.  If the compared signatures were exactly the same, CCFmax would be 100%.  Comparison results show close agreement among the four techniques for bullet profile signature measurements.  The average CCFmax values are higher than 90%.  This supports the possibility of using surface topography techniques for ballistic identifications as an alternative to the current technology based on image comparisons.
Citation: Measurement Science & Technology
Volume: 17
Pages: pp. 500 - 503
Keywords: auto-correlation function;confocal microscope;cross-correlation function;standard bullet;standard reference material;topography comparison
Research Areas: Metrology, Manufacturing