By Norman Marin
Alternate gentle resource Imaging offers a quick consultant to electronic imaging utilizing mirrored infrared and ultraviolet radiation for crime scene photographers. transparent and concise guideline illustrates the best way to accomplish stable pictures in various 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 rules that make this sort of images attainable are defined, by way of the fundamental steps that may be applied to seize prime quality evidentiary photos.
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Extra info for Alternate Light Source Imaging. Forensic Photography Techniques
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. 18A shows a photograph of a person who was bound at the wrists with rope. The top image here was captured shortly after the restraints were removed, and the bottom image is a photograph of the wrist using reflected UV illumination, in a darkroom, with a yellow filter 1 day after the restraints were removed.
Although the filters are coated, they should be handled only by the edges or in the corners to avoid damage. 1 Fibers and Trace Evidence Fluorescence can be used as a tool to further aid the characterization of both colored and colorless fibers. 10). Fiber fluorescence can be attributed to a number of factors. Animal fibers such as wool and many commercial polymers exhibit their own characteristic fluorescence. 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.
0, 15 seconds, and ISO 200. 21). 3 Body Fluids Tunable light sources have long been used for the detection of biological fluids. Although they cannot be used to identify which type of fluid is present, they have been the mainstay for a forensic examiner attempting to locate biological evidence. Biological evidence can be detected using an FLS due to the inherent fluorescent properties of semen, saliva, vaginal secretions, urine, and sweat. Blood by contrast absorbs radiation extending from the UV into the IR, with the strongest absorption in the UV/blue-violet region of the electromagnetic spectrum Most bodily fluids will respond to radiation from a UV source.
Alternate Light Source Imaging. Forensic Photography Techniques by Norman Marin