Get Alien Vision: Exploring the Electromagnetic Spectrum with PDF

By Austin Richards

ISBN-10: 0819485357

ISBN-13: 9780819485359

Austin Richards takes readers on a visible travel of the electromagnetic spectrum past the diversity of human sight, utilizing imaging know-how because the capacity to "see" invisible mild. Dozens of colourful photos and transparent, concise descriptions make this an exciting, obtainable technical publication. Richards explains the sunshine spectrum, together with obvious gentle, and describes the complicated imaging applied sciences that permit people to synthesize our personal model of "alien" imaginative and prescient at diversified wavelengths, with functions starting from fireplace struggling with and legislation enforcement to botany and drugs.

the second one variation expands current content material, explores contemporary components of analysis, and gives new illustrations that reveal the range of imaginative and prescient through the spectrum

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Additional resources for Alien Vision: Exploring the Electromagnetic Spectrum with Imaging Technology

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How can we see the world in near-ultraviolet light without removing our eye lenses, which is an unpleasant prospect? As with near-IR light, ordinary film and camera optics will function with near-UV light. 6 Unlike infrared pictures, which require special film, near-UV pictures 4 T. Goldsmith, “Hummingbirds see near ultraviolet light,” Science 207, 786–788 (1980). The 365-nm light comes from a mercury vapor lamp known as a Wood’s Lamp. This experiment was carried out in 1956. Kennedy, D. D. Biol.

15 Four views of a paper label on a cardboard box: (a) visible: 400–750 nm; (b) NIR: 830–1100 nm; (c) SWIR: 1400–1700 nm; (d) SWIR: 2000–2500 um. 16 254 nm. 17 VIS and NIR images of a cotton shirt showing a GSR pattern. (Courtesy of Heidi Nichols, Miami-Dade County Medical Examiner’s Office) at close range, there is a distinctive pattern of gunshot residue (GSR). This material can be a mixture of burned and unburned smokeless powder, and burnt primer. GSR patterns can be used to match a particular firearm to a victim’s article of clothing.

This property allows for noninvasive analysis of materials. For example, ultraviolet imaging has an interesting application in dermatology. Human skin is normally opaque to ultraviolet light, as the chemical pigment melanin absorbs it. Thus, people with normally pigmented skin appear much darker in the ultraviolet than they do in the visible. If the melanin is destroyed over time by exposure to ultraviolet light, it can penetrate to sensitive inner layers and cause damage to the basal cells, which are approximately 2 mm below the surface.

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Alien Vision: Exploring the Electromagnetic Spectrum with Imaging Technology by Austin Richards

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