Download Alternate Light Source Imaging. Forensic Photography by Norman Marin PDF

By Norman Marin

Alternate gentle resource Imaging offers a quick advisor to electronic imaging utilizing mirrored infrared and ultraviolet radiation for crime scene photographers. transparent and concise guide illustrates the right way to accomplish strong images in a number of forensic occasions. It demonstrates how tunable wavelength gentle resources and electronic imaging options can be utilized to effectively find and rfile actual facts on the crime scene, within the morgue, or within the laboratory. The medical ideas that make this sort of images attainable are defined, via the fundamental steps that may be applied to trap prime quality evidentiary pictures.

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Extra resources for Alternate Light Source Imaging. Forensic Photography Techniques

Example text

It is directly related to the transmittance of the material, which is the ability of light to propagate through a given medium. Shortpass filter: A type of filter where the transmission band is shorter in wavelength than the region blocked. Transmission: Transmittance refers to the percentage of radiation that can pass through an optical element. Wood’s glass: An optical filter coated with nickel oxide that was invented by the physicist Robert Wood (1919) at the turn of the twentieth century. The filter blocks most visible light with the exception of violet and transmits both UV and IR radiation.

IR is usually divided into three spectral regions: near-, mid- and farIR, and ranges roughly from 700 to 1000 nm (1 µm) in wavelength. The boundaries between the near-, mid-, and far-IR regions are not finite and can vary slightly depending on the information source. Between roughly 700 and 3000 nm is referred to as the near-IR. The full spectrum of IR is not used for DSLR IR photography. Camera sensors are sensitive from about 350 to 1000 nm. Therefore, the same recording techniques for NIR can be used for visible light observations, with the exception for observation by the naked eye.

Infrared simply means the part of the electromagnetic spectrum that is longer in wavelength than red. As discussed earlier, the classification of electromagnetic radiation by wavelength is called the electromagnetic spectrum. Our eyes can only perceive the visible light portion of the electromagnetic spectrum. However, digital cameras and film emulsions are sensitive to the ultraviolet (UV, radiation shorter than blueviolet light) and IR. One of the popular misconceptions of IR photography is the visualization of heat escaping from windows and doorways lacking proper insulation.

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