Alternate Light Source Imaging. Forensic Photography - download pdf or read online

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By Norman Marin

ISBN-10: 1455777625

ISBN-13: 9781455777624

Alternate mild resource Imaging presents a quick advisor to electronic imaging utilizing mirrored infrared and ultraviolet radiation for crime scene photographers. transparent and concise guide illustrates easy methods to accomplish solid pictures in a number of forensic occasions. It demonstrates how tunable wavelength gentle assets and electronic imaging recommendations can be utilized to effectively find and record actual facts on the crime scene, within the morgue, or within the laboratory. The clinical rules that make this kind of images attainable are defined, by means of the elemental steps that may be applied to seize top of the range evidentiary photos.

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This will narrow the useful bandwidth of UV to about 350À400 nm. Films used for UV photography, such as the Kodak T-Max series, are sensitive into the far-UV region. In order to photograph the far-UV region using film, a different type of camera lens needed to be employed. Lenses such as the Nikon Nikkor 105 mm UV lens are typically made of quartz or fused silica and transmit well into the far-UV region. These lenses were expensive and are not 28 Alternate Light Source Imaging readily available anymore, and probably got packed away with the 35-mm film equipment.

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.

At close range, these residues have enough energy to embed in skin or clothing. 42 Alternate Light Source Imaging Gunshot residue can be difficult to visualize if the residue is deposited onto dark colored clothing, the victim has dark pigmented skin, or the residue is concealed by blood. Gunshot residue is particularly labile and can be lost readily. 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.

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Alternate Light Source Imaging. Forensic Photography Techniques by Norman Marin


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