By Austin Richards
Austin Richards takes readers on a visible journey of the electromagnetic spectrum past the diversity of human sight, utilizing imaging know-how because the capacity to "see" invisible mild. Dozens of colourful photographs and transparent, concise descriptions make this an fascinating, obtainable technical booklet. Richards explains the sunshine spectrum, together with noticeable gentle, and describes the complicated imaging applied sciences that allow people to synthesize our personal model of "alien" imaginative and prescient at varied wavelengths, with purposes starting from fireplace struggling with and legislation enforcement to botany and drugs.
the second one variation expands latest content material, explores fresh parts of study, and gives new illustrations that reveal the variety of imaginative and prescient through the spectrum.
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Extra info for Alien Vision: Exploring the Electromagnetic Spectrum with Imaging Technology, Second Edition (SPIE Press Monograph Vol. PM205)
Prior ultraviolet damage to skin is revealed with near-UV photography, as shown in Fig. 16. 15 Visible (left) and near-UV (right) images of Canadian arctic military camouflage. (Courtesy of Dr. David Lavigne) image was taken with conventional black and white film and a UV-transmitting filter in the 350–380-nm waveband. 16 Visible (left) and near-UV (right) images of skin cancer. (Courtesy of Dr. Norman Goldstein) The visible image of skin on the patient’s face appears fairly uniform, except for an ulcerating basal-cell cancer on the bridge of her nose.
Recall the example of the stove burner in the last chapter. It emitted SWIR light even when it appeared black to the eye. Turn off the burner, wait long enough, and the burner will cool to a temperature just a little above room temperature. It is then indistinguishable from the other burner if imaged in the SWIR waveband. Before the burner achieves thermal equilibrium with its surroundings, it will only be a few degrees hotter than the one that was never heated. It will not feel hotter than the other burner to the finger, and yet the temperature difference will be easy to see with a thermal imaging camera.
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. The infrared image of the glass of water shows that the light within the camera’s spectral sensitivity (900–1680 nm) is highly absorbed, and thus would not be useful for imaging underwater. The absorption of near-IR light in liquid water continues into the visible waveband on the red end (as well as into longer-wavelength IR wavebands).