Alternate Light Source Imaging: Forensic Photography by Norman Marin

By Norman Marin

Alternate mild 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 images in numerous forensic events. It demonstrates how tunable wavelength mild assets and electronic imaging concepts can be utilized to effectively find and record actual proof on the crime scene, within the morgue, or within the laboratory. The clinical ideas that make this kind of images attainable are defined, via the fundamental steps that may be applied to seize top of the range evidentiary pictures.

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The incorporation of colored dyestuffs that have the ability to fluoresce and the exposure to the fluorescent whitening agents found in household laundry detergents also contribute to the fluorescence of a fiber. Due to the presence of certain colored impurities, textile fibers do not appear absolutely white. Many organic materials do not look completely white; they tend to absorb more blue-violet radiation, and in consequence appear to have a yellowish hue in reflected light. 10 (A) Photographed with photoflood lights.

He recommends the Baader Venus UV transmission filter. This filter has a UV bandpass from 325 to 390 nm. It also has a near-IR bandpass at 1150 nm, but this is beyond the sensitivity of a silicon-based digital camera sensor. 3 UV LIGHT SOURCES Sources used for UV photography can be of two types: continuous and line. Continuous sources emit radiation where the intensity slowly changes as a function of wavelength. Line sources only emit a number of lines or wavelength bands over a limited wavelength range.

Injuries that occur deep into tissue may require illumination between the green and the red regions of the electromagnetic spectrum as these wavelengths can penetrate well into the dermal and subcutaneous regions of the skin. The amount of light reflected or absorbed by the subject’s skin is subject to bioindividual variation. 16). 17A shows a photograph of the right leg, inner thigh region, of a domestic violence victim. Russian words were carved into her leg with a razor. 17B, 450 nm illumination from a SPEX HandScope and a yellow barrier filter was used to enhance the scarring in order to make the lettering more visible.

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