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 guideline illustrates tips to accomplish solid pictures in numerous forensic occasions. It demonstrates how tunable wavelength gentle resources and electronic imaging recommendations can be utilized to effectively find and rfile actual facts on the crime scene, within the morgue, or within the laboratory. The clinical rules that make this sort of images attainable are defined, by means of the elemental steps that may be applied to trap top of the range evidentiary pictures.
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Additional resources for Alternate Light Source Imaging. Forensic Photography Techniques
28B could not be visualized with normal flash photography or with oblique, white light, illumination. 28 Fluorescent printing on the back of an official New York State driver’s license. 0, 8 seconds, ISO 200, and no filter over the camera lens. 60 Alternate Light Source Imaging Certain denominations of modern US currency (circa 1990) have a thin vertical strip of fabric woven into the note about 25 mm from the left edge. ” The currency note was illuminated with near-UV illumination (365 nm), in a darkroom, and with no filter over the camera lens.
15). 3 Bruising, Bite Marks, and Ligature Marks Bruise marks, ligature marks, bite marks, and any injury that results in damage to skin and/or small blood vessels beneath the skin can be illuminated with near-UV and visible radiation to establish contrast. There are a few basic ideas behind the ability to document physical injuries with a tunable light source. When bodily tissue is damaged, blood may be released into the interstitial spaces surrounding small vessels near the injury site, creating a bruise.
5 ALTERNATE LIGHT SOURCES The terms ALS, FLS, and high-intensity tunable wavelength light source are often used interchangeably. They all have several things in common: (i) an intense source that emits radiation over the UV, visible, and IR spectral regions and (ii) a series of specially designed filters that allow the user to select narrow bands of radiation, typically in the 20À100 nm range. Not all light sources are created equal, and several factors need to be considered before purchasing a light source: • Intensity of the source • Number of bands or wavelength colors to select from • Portability/user friendliness.
Alternate Light Source Imaging. Forensic Photography Techniques by Norman Marin