![]() Imaging the entire phone required the use of a large chamber and stage, variable pressure conditions, wide-field scanning, panorama image stitching, stereo image acquisition, 3D reconstruction, large area EDS x-ray mapping, and SEM/EDS particle analysis. 1, right) to illustrate the resulting damage that caused particles to be generated. The condition of the iPhone was documented in the TESCAN VEGA SEM before and after the test-firing (Fig. These particles were collected and served as an ideal case study for particle analysis and comparison. A simulated trace-evidence scenario subjected an iPhone 4S to a gunshot, generating glass particles from the iPhone’s front and back covers. ![]() This article discusses the use of SEM-EDS and X-ray micro-computed tomography (micro-CT) for the analysis of glass particles, in order to link them to the glass covering a smartphone. ![]() The concept of trace evidence in forensic science originates from Locard’s exchange principle, which states that “every contact leaves a trace.” The trace evidence is typically in the form of particles of skin, hair, fibers, clothing, soil, paint, and glass, among other materials. The identification of unknown particles by comparison of scanning electron microscopy - energy dispersive spectroscopy (SEM-EDS) data to reference materials is valuable because it provides fast results describing particle composition and morphology with limited sample preparation. ![]()
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