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

By Austin Richards

Austin Richards takes readers on a visible travel of the electromagnetic spectrum past the diversity of human sight, utilizing imaging expertise because the ability to "see" invisible mild. Dozens of colourful photos and transparent, concise descriptions make this an interesting, obtainable technical ebook. Richards explains the sunshine spectrum, together with obvious mild, and describes the complex imaging applied sciences that allow people to synthesize our personal model of "alien" imaginative and prescient at various wavelengths, with functions starting from hearth combating and legislations enforcement to botany and medication.

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

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Extra info for Alien Vision: Exploring the Electromagnetic Spectrum with Imaging Technology

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This is sometimes crucial to preserve evidence, as dusting for fingerprints can destroy or blur them out. 26 shows a magazine cover imaged in visible light as well as a magnified view of an area of the magazine imaged in both the visible band and with shortwave UV light. The red box superimposed on the magazine cover shows the area with the sweaty fingerprints, which appear brighter than the paper background. The salt crystals in the prints diffusely reflect the UV light into the camera, while the paper absorbs the UV, giving the resulting image a great deal of contrast.

Near-UV imaging is also useful for the detection of certain flames, rocket plumes, and hydrogen fires, all of which emit ultraviolet light. Methanol flames have a UV signature in the 240–280-nm waveband, and this makes it possible to detect methanol fires in broad daylight. 43 shows a composite image of a pair of small methanol fires taken with a special camera system that consists of a visible-light camera mounted to a UV-sensitive camera with a solar-blind filter (solar blind is 240–280 nm). The visible-light channel is necessary because the solar-blind UV images alone would be nearly all black.

There are two types of prints, oily and sweaty. Both are often very difficult to see with the unaided eye, even with a magnifying glass, because the skin oils and dried sweat tend to be transparent to visible light. These skin oils do not transmit shortwave UV light readily, and the salt crystals in sweaty prints tend to scatter shortwave UV light more than visible light. These two UV optical properties can be exploited to detect both types of fingerprints on nonporous surfaces without physical contact.

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