Download PDF by Austin Richards: Alien Vision: Exploring the Electromagnetic Spectrum with

By Austin Richards

ISBN-10: 0819485357

ISBN-13: 9780819485359

Austin Richards takes readers on a visible journey of the electromagnetic spectrum past the variety of human sight, utilizing imaging expertise because the potential to "see" invisible gentle. Dozens of colourful photos and transparent, concise descriptions make this an exciting, obtainable technical booklet. 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 assorted wavelengths, with purposes starting from fireplace combating and legislations enforcement to botany and drugs.

the second one variation expands current content material, explores fresh parts of analysis, and gives new illustrations that show the range of imaginative and prescient during the spectrum

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Biol. Phot. 61, 115–132 (1993). T. , Science 166, 1172–1174 (1969). 5 7 Robert Wood in the UV band. Near-Infrared Imaging The near-infrared band is usually defined as 750 nm to 1100 nm, 750 nm being the edge of normal human vision and 1100 nm being the cutoff wavelength for silicon detectors. This is the first infrared band where photographs were taken, and the first band of invisible light to be used in electronic imaging. Night Vision and Surveillance with Near-IR Imaging The ability to see in the dark without being detected must be one of mankind’s oldest wishes.

Military Uses of SWIR Imaging There are many uses for SWIR imaging in military applications, including visualization of laser designators, detecting camouflage, and range-gated imaging, which is a special technique for seeing through snow, rain and dust. One very interesting example of SWIR imaging is shown in Fig. 24: a test in February 2010 of the missile-destroying capability of the Airborne Laser (ABL) system, a specially modified Boeing 747 with a huge SWIR chemical laser weapon integrated into the entire rear of the plane.

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. The damaged skin will look white in color—this is called actinic keratosis. Sometimes skin damage looks darker in the UV band than in the visible band.

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

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