By Norman Marin
Alternate gentle resource Imaging presents a quick advisor to electronic imaging utilizing mirrored infrared and ultraviolet radiation for crime scene photographers. transparent and concise guide illustrates tips on how to accomplish sturdy pictures in numerous forensic occasions. It demonstrates how tunable wavelength gentle resources and electronic imaging suggestions can be utilized to effectively find and rfile actual proof on the crime scene, within the morgue, or within the laboratory. The medical ideas that make this sort of images attainable are defined, by means of the fundamental steps that may be applied to trap prime quality evidentiary images.
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Extra resources for Alternate Light Source Imaging. Forensic Photography Techniques
B) The lamp turned on, photographed in a darkroom with the lights off and no filter over the lens. (C) Illustrates the IR leak. Image photographed in a darkroom with a Kodak Wratten #87 placed over the camera lens. 7 Illustrates the hotspot and uneven illumination that can be produced by an LED flashlight unit. UV and Narrowband Visible Light Imaging 33 Electronic flash units with a xenon source also have a UV output, but only if the straw-colored yellow filter that can be seen around the bulb is absent.
UV and Narrowband Visible Light Imaging 27 down into various subgroups and is largely industry dependent. For our purposes, the near-UV region is between approximately 300 and 400 nm (nearest to violet) and the far-UV region is between approximately 200 and 300 nm (furthest from violet). UV photography can be used to enhance evidence such as • • • • • • Biological fluids Fingerprints Bruising Gunshot residues Fibers Documents. 2 PHOTOGRAPHIC EQUIPMENT Cameras that have been modified or converted to full spectrum cameras, where the internal hot mirror has been removed, are only sensitive down to about 300 nm.
A nondestructive approach is therefore necessary prior to chemical and instrumental analysis. Fluorescence can be induced in the partially burnt organic constituents of gunshot residue. 14AÀD). Pizzola (1998) studied the photoluminescence of gunshot residues extensively. The technique involves treating the gunshot residues in situ with 1M hydrogen chloride (1M HCl) followed by immersion in liquid nitrogen. The chloride ion can form a complex with the fine vaporous lead, antimony, and any such metal deposits that may reside on the particulate.
Alternate Light Source Imaging. Forensic Photography Techniques by Norman Marin