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 capability to "see" invisible gentle. Dozens of colourful pictures and transparent, concise descriptions make this an fascinating, available technical ebook. Richards explains the sunshine spectrum, together with seen gentle, and describes the complex imaging applied sciences that allow people to synthesize our personal model of "alien" imaginative and prescient at assorted wavelengths, with purposes starting from hearth combating and legislation enforcement to botany and drugs.
the second one variation expands latest content material, explores fresh parts of study, and offers new illustrations that show the range of imaginative and prescient during the spectrum
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Additional info for Alien Vision: Exploring the Electromagnetic Spectrum with Imaging Technology
This ultraviolet vision can see markings and patterns on flowers that we humans cannot. 34 shows three Black-Eyed Susan flowers (Rudbeckia hirta) imaged in both the visible and near-UV (350–380 nm) regions of the spectrum. The visible image shows a uniform yellow color throughout, except for the dark center, but the near-UV image reveals a complex pattern of light and dark zones, which serve to guide the pollinating honeybee to its destination. These patterns are known as nectar guides and are believed to play a role in insect pollination.
For example, there are commercially available miniature infrared beacons that can be attached to the roof of a vehicle and then tracked from the air by law enforcement with night-vision devices. It is interesting to look at a person in total darkness with a near-IR viewer and a purely near-infrared light source. Human skin reflects equally well no matter what the skin color, so that dark-skinned people appear the same color as light-skinned people. Eye pupils dilate completely, giving them a glowing-eye appearance, due to the human retina’s high reflectivity in the near-IR and red regions of the spectrum.
As with the whiteout and ink in the preceding altered document example, the paper label becomes increasingly opaque in the UV band, as shown in Fig. 16. The near-UV image is 365 nm and the shortwave UV image is 254 nm. The shortwave UV image shows some staining on the paper under the numeral 3. Forensics photographers use various invisible-light wavebands to uncover evidence at crime scenes or on crime victims. Sometimes the evidence is difficult or impossible to see with the naked eye, and sometimes the invisible-light band reveals information that is not otherwise apparent.
Alien Vision: Exploring the Electromagnetic Spectrum with Imaging Technology by Austin Richards