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26 May 2011 Measurement and characterization of cylindrical surfaces by deflectometry applied to ballistic identification
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Abstract
This paper describes an optical device that uses a new configuration of a technique known as deflectometry applied to ballistic identification. The main novelty is characterized by the use of a 45° conical mirror to measure the near cylindrical surface of the bullet. deflectometry is an optical technique sensitive to variations in topography and unevenness of a surface. This technique allows to identify and to measure the geometry of objects based on the distortions observed in a sequence of image patterns reflected on the surface of interest. The measurement by deflectometry is very sensitive to the surface local gradients and curvatures. In this paper it is applied to forensic ballistic in order to verify if a given bullet could be fired by a suspect weapon. Comparisons between images of bullets fired by the same weapon were made.
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A. V. Fantin, C. Veiga, and A. Albertazzi "Measurement and characterization of cylindrical surfaces by deflectometry applied to ballistic identification", Proc. SPIE 8082, Optical Measurement Systems for Industrial Inspection VII, 808214 (26 May 2011); https://doi.org/10.1117/12.888201
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