By Austin Richards
Austin Richards takes readers on a visible travel of the electromagnetic spectrum past the variety of human sight, utilizing imaging know-how because the skill to 'see' invisible mild. Dozens of colourful photos and transparent, concise descriptions make this an fascinating, available technical publication. 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 various wavelengths, with functions starting from hearth combating and legislations enforcement to botany and medicine.
- record of Figures
- Infrared and Ultraviolet: the perimeters of the Rainbow
- Thermal Imaging: all of us Glow at nighttime
- Microwave and Millimeter-Wave Imaging: Piercing the Veil
- X Rays and Gamma Rays: Crookes Tubes and Nuclear gentle
- Acoustic Imaging: Seeing with Sound
- Sweeping throughout the Spectrum: Comparative Imagery
- Bibliography and net assets
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Extra resources for Alien Vision: Exploring the Electromagnetic Spectrum with Imaging Technology
Light at this wavelength tends to be highly absorbed. Water is only weakly absorbent in the visible waveband, especially to blue light. We can visualize the infrared absorption of water with SWIR imaging technology. 20 show a glass of water viewed in both visible light and SWIR light in the 900–1680-nm waveband. 20 Visible (left) and SWIR (right) images of water in a plastic cup. ) The water looks like strong coffee. Near-IR and SWIR light is strongly absorbed by liquid water, owing to the presence of molecular absorption bands in water at various wavelengths, including 760, 970, 1190, and 1450 nm.
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—it is called a stretch mode. Water has a strong absorption band at a 1450-nm wavelength. Light at this wavelength tends to be highly absorbed. Water is only weakly absorbent in the visible waveband, especially to blue light. We can visualize the infrared absorption of water with SWIR imaging technology. 20 show a glass of water viewed in both visible light and SWIR light in the 900–1680-nm waveband.
The visible image shows a dark patch where the alcohol has soaked into the metal deck, but the SWIR image shows bright white patches of flame around the hose. Near-UV imaging is also useful for the detection of certain flames, rocket plumes, and hydrogen fires, all of which emit ultraviolet light. 23 Visible (top) and SWIR (bottom) images of methanol fire. ) ble to detect methanol fires in broad daylight. 24 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 solarblind filter.