By Austin Richards
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 gentle. Dozens of colourful pictures and transparent, concise descriptions make this an exciting, obtainable technical publication. Richards explains the sunshine spectrum, together with seen mild, and describes the complex imaging applied sciences that let people to synthesize our personal model of 'alien' imaginative and prescient at assorted wavelengths, with purposes starting from fireplace struggling with and legislations enforcement to botany and medicine.
- checklist of Figures
- Infrared and Ultraviolet: the sides of the Rainbow
- Thermal Imaging: all of us Glow at midnight
- Microwave and Millimeter-Wave Imaging: Piercing the Veil
- X Rays and Gamma Rays: Crookes Tubes and Nuclear mild
- Acoustic Imaging: Seeing with Sound
- Sweeping in the course of the Spectrum: Comparative Imagery
- word list
- Bibliography and net assets
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Extra info for Alien vision : exploring the electromagnetic spectrum with imaging technology
The electric fields ionize gas in the vicinity of the tips. When the gas is air, one sees a faint blue-violet glow emitted by nitrogen and other gases in our atmosphere. The name corona, which means “crown” in Latin, comes from the crown- or brushlike shape of the discharge from the end of conductors such as lightning rods during an electrical storm, faulty high-voltage transmission lines, or ship’s masts (sailors call it Saint Elmo’s Fire). Corona is an undesirable condition in the world of power transmission.
Herschel, Phil. Tran. Roy. Soc. 90, 284–347 (1800). T. Goldsmith, 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. Bull. 111, 375 (1956). aspx 30 Chapter 1 6. The antireflection coatings on quality lenses are optimized for visible light, and thus are not ideal for UV photography. 7. R. Williams, G. Williams, Jour. Biol. Phot. 61, 115–132 (1993). 8. T. , Science 166, 1172–1174 (1969).
The visible-light channel is necessary, because the UV image alone would be nearly black by itself, due to the solar-blind filter. Infrared Photography and Heat Detection Many people are under the impression that the infrared photographic film described earlier enables one to take photographs of people or other warm objects in total darkness. This is incorrect. In fact, people do radiate infrared light that can reveal them even in total darkness, but that light is known as Midwave or Longwave Infrared (MWIR and LWIR), and has wavelengths that are up to 10 times longer than the wavelength of near-IR light.
Alien vision : exploring the electromagnetic spectrum with imaging technology by Austin Richards