3d bullet and cartridge case analysis

Details 3d bullet and cartridge case analysis 3d bullet and cartridge case analysis

G - Physics

01

B

G01B 11/24 (2006.01) G01N 21/84 (2006.01)

Patent

CA 2574824

A method and an apparatus to obtain a surface mapping of a ballistic piece of evidence (BPOE) under examination, such as a bullet or a spent cartridge case, that can be used thereafter as a 3D signature for identifying purpose during ballistic test comparison. The method comprises providing a measurement unit adapted to acquire a relief map of the surface of the BPOE and acquiring with the measurement unit the relief map of the surface to thereby obtain the mapping of the surface of the BPOE. Preferably, the measurement unit of the present invention comprises a confocal sensor such as confocal microscope. Also, the present invention includes acquiring the relief map of the bullet surface or of the cartridge case surface by acquiring and assembling a mosaic of regional reliefs that are partly overlapping with their surroundings regional reliefs.

L'invention concerne un procédé et un appareil de mappage de surface d'une preuve balistique (BPOE) examinée, par exemple une balle ou une douille de cartouche usée, pouvant être ensuite utilisée comme signature 3D à des fins d'identification au cours d'une comparaison d'essai balistique. Le procédé consiste à utiliser une unité de mesure adaptée pour acquérir une carte en relief de la surface de la preuve balistique, et à acquérir à l'aide de l'unité de mesure la carte en relief de la surface afin de procéder au mappage de la surface de la preuve balistique. L'unité de mesure de la présente invention comprend, de préférence, un capteur confocal, par exemple un microscope confocal. La présente invention consiste également à acquérir la carte en relief de la surface de la balle ou de la surface de la douille de cartouche par acquisition et assemblage d'une mosaïque de reliefs localisés chevauchant en partie des reliefs localisés adjacents.

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