Download Alien vision : exploring the electromagnetic spectrum with by Austin Richards PDF

By Austin Richards

Austin Richards takes readers on a visible travel of the electromagnetic spectrum past the diversity of human sight, utilizing imaging expertise because the skill to 'see' invisible gentle. Dozens of colourful photos and transparent, concise descriptions make this an fascinating, available technical ebook. Richards explains the sunshine spectrum, together with noticeable gentle, and describes the complicated imaging applied sciences that let people to synthesize our personal model of 'alien' imaginative and prescient at diversified wavelengths, with purposes starting from hearth scuffling with and legislations enforcement to botany and medicine.

Contents

- record of Figures

- Preface

- creation

- 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 gentle

- Acoustic Imaging: Seeing with Sound

- Sweeping during the Spectrum: Comparative Imagery

- Epilogue

- word list

- Bibliography and net assets

- Index

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Extra info for Alien vision : exploring the electromagnetic spectrum with imaging technology

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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. The near-ultraviolet photograph reveals many dark patches in the deep skin layers, some of which are precancerous lesions, as well as the existence of two other basal-cell cancers: one on the nose just above the ulcerating cancer and one under the left eye.

As I discussed in the introduction, electrons move in response to the electric field of the lightwave. aspx 22 Chapter 1 (bound to a molecule, for example) then they respond strongly to lightwaves with a particular frequency. For example, water molecules have a strong response to many wavelengths of infrared light, particularly at a wavelength of 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.

In both cases, scattering of light is absent—in one case because of the long wavelength of IR light, in the other case, because of the lack of an atmosphere. These effects are very apparent in the following example. 2 shows an IR image of one of the pyramids and the Sphinx on a sunny day. Note the dark sky, which appears “cold” to the IR camera that imaged this scene in the 3–5 µm waveband (MWIR). The infrared intensities in the image are represented by pseudocolor. The color bar on the right side of the image shows the color scale from hottest to coldest.

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