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 potential to 'see' invisible mild. Dozens of colourful pictures and transparent, concise descriptions make this an fascinating, obtainable technical e-book. Richards explains the sunshine spectrum, together with seen mild, and describes the complex imaging applied sciences that allow people to synthesize our personal model of 'alien' imaginative and prescient at varied wavelengths, with functions starting from hearth scuffling with 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 the hours of darkness
- Microwave and Millimeter-Wave Imaging: Piercing the Veil
- X Rays and Gamma Rays: Crookes Tubes and Nuclear mild
- Acoustic Imaging: Seeing with Sound
- Sweeping during the Spectrum: Comparative Imagery
- Bibliography and web assets
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Additional info for Alien Vision: Exploring the Electromagnetic Spectrum with Imaging Technology
I have particularly cold cheeks and a cold nose due to a case of frostbite that permanently damaged the capillaries in my skin; therefore those areas appear dark. Note the patchy hot spots on the neck and jaw. These hot spots change with time, and are caused by natural variations in blood flow. The eyes are the warmest spot on the face, warmed by the copious blood flow near the surface. 3 MWIR image of footprints. ) and only the surface layer emits MWIR light; all of the detail (iris, pupil) we see with visible light is hidden, as shown in Fig.
For the sake of simplicity, I will refer to the MWIR and LWIR bands as the infrared or IR waveband, and the corresponding imaging technology as thermal imaging. The infrared band is one of the more interesting regions of the spectrum for imaging because objects at terrestrial temperatures (people, cars, animals) emit light in this waveband. The higher an object’s temperature, the brighter it appears. For example, in a typical thermal image, a person standing in a room will appear to glow bright white against a dark background.
Also, the glowing burner is reflected in the stainless-steel splash panel behind it. That splash panel has a brushed finish, and is not very reflective to visible light, since the brush marks and ridges on the surface are larger than a wavelength of visible light. However, the surface is a much better reflector of the longer wavelengths of SWIR light emitted by the burner. As the burner cools further, the SWIR glow disappears. The light emitted by the burner becomes increasingly longer in wavelength as it cools.