The process of setting up and centering a specimen takes only a few seconds, facilitated by simple and robust labor-saving attachments:
- magnetic, plasticine- and adhesive-coated stands for bullets/cases and deformed specimens of any length and material
- centering collets
- cartridge case holder for scanning an object’s base
- holder for projectiles (shots/pellets) fired from smoothbore guns
- semiautomatic dial-type holder for continuous scanning of headstamps of ten cartridge cases.
ARSENAL provides 360-degree circumference imaging of bullets and cartridge cases and imaging of cartridge cases’ full headstamps as well as selective imaging of specific regions on deformed and fragmented specimens, on shotgun projectiles that bear unique ballistic signatures.
The open stage on which objects are placed allows the firearm examiner to scan any exhibits, even severely deformed as well as those of a great length (e.g. shotgun cases), and to control visually the scanning process.
Orientation-independent positioning of a cartridge case makes the image acquisition process easier. Besides, it is not imperative to set up the cartridge case its base to be strictly parallel to the lens plane – the setting error is compensated by the software algorithm and has no impact on the image quality.
Centering a bullet with the collet
to prepare for scanning its side surface
Positioning a cartridge case to scan
Semi-automatic dial-type holder
for continuous scanning
Images are captured with a linear CCD sensor over the entire scanning window (20 mm x 20 mm) in much the same way as flatbed scanners do this. The seamless image of the entire surface is generated in the process of scanning, which makes a valuable advantage this method provides versus fragmentary techniques where the final image is a result of “pasting together“ separate fragments with elimination of inevitable borderline defects and compensation for light differences on neighboring areas with significant differentials in relief altitudes.
The outcome of each scanning session presents exact digital copies of an object’s surface:
- 2D grayscale image (65,536 gray shades) with the resolution of 3 μm/pixel
- 3D image of the surface, with the resolution of 10 μm/pixel on all axes.
The declared resolution in any place of any surface, including distorted and those with salient relief, is ensured by the “layer-by-layer” scanning technology applied with the small depth of focus along the entire profile of an object’s deformation. Every next layer is scanned with the optical system automatically shifted.
The scanner allows diverse modes of lighting in which objects can be scanned:
- bullets’ and cartridge cases’ sides, shell fragments and deformed bullets are scanned in oblique lighting
- cartridge cases’ full headstamps are scanned in:
- direct annular lighting
- 45°-sectored lighting at various angles.
Both automatic focusing and calculation of requisite light intensity exclude the overexposure when capturing images, thereby avoiding loss of information.
The scanner works equally fine with all specimens though made of different material compositions – the reflecting and diffusing properties of material are considered when calculating the light intensity.
The PAPILLON ballistic scanner is utterly user-friendly and fail-safe and it requires just the simplest computer skills from the operator.
PAPILLON BS Surface Scanner Features:
|Maximum scanning depth
|Field of vision
||20 Θ 20 mm
|Resolving capacity (2D)
|Resolving capacity (3D)
|Caliber of bullets/cartridge cases
||1 to 22 mm
|Bullet/case side scanning time
Cartridge case head scanning time:
1 images captured in annular light
1image captured in annular light and 8 images in sectored light
|Measurement accuracy of land width
|Measurement accuracy of rifling pitch
||400 Θ 228 Θ 217 mm