1 May 2014 Two-wavelength phase shift interferometry to characterize ballistic features
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We apply two-wavelength phase shifting interferometry to generate 3D surface profile maps of spent bullet cartridge cases. From the captured interferograms, an optimized algorithm was used to calculate a phase profile from which a precise digital surface map of the cartridge casing may be produced. This 3D surface profile is used to enhance a firearms examiner's ability to uniquely identify distinct features or toolmarks imprinted on the casing when the weapon is fired. These features play a key role in the matching process of ballistic forensic examination.
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Glenn W. Pagano, Glenn W. Pagano, Christopher J. Mann, Christopher J. Mann, } "Two-wavelength phase shift interferometry to characterize ballistic features", Proc. SPIE 9131, Optical Modelling and Design III, 91311K (1 May 2014); doi: 10.1117/12.2051859; https://doi.org/10.1117/12.2051859

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