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 photographs and transparent, concise descriptions make this an exciting, obtainable technical booklet. Richards explains the sunshine spectrum, together with noticeable mild, and describes the complex imaging applied sciences that let people to synthesize our personal model of "alien" imaginative and prescient at diverse wavelengths, with functions starting from fireplace combating and legislation enforcement to botany and drugs.
the second one variation expands latest content material, explores contemporary parts of analysis, and offers new illustrations that show the range of imaginative and prescient through the spectrum
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Extra resources for Alien Vision: Exploring the Electromagnetic Spectrum with Imaging Technology
If the electrons are constrained (bound to a molecule, for example), then they respond strongly to lightwaves with a particular frequency. For example, water molecules have a strong absorption band at a 1450-nm wavelength—light at this wavelength tends to be highly absorbed. This light causes an excitation of the bond between hydrogen and oxygen atoms in a water molecule. The excitation is akin to a rapid stretching and contracting of this bond, which is called a stretch mode. Water is only weakly absorbent in the visible waveband, especially to blue light.
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.
The shoe impression changes the texture of the wax surface and affects how light is scattered from it. Paint is generally composed of a transparent organic resin or polymer with pigment particles suspended in it. As we have seen earlier in this chapter, the pigment particles may not scatter NIR or SWIR light sufficiently to make the paint opaque. In the UV band, conventional paint is always opaque. The reflectivity of the paint surface can vary greatly over time, especially for exterior paint exposed to sunlight, and this property can be exploited to tell old paint from new.
Alien Vision: Exploring the Electromagnetic Spectrum with Imaging Technology by Austin Richards