Alien Vision: Exploring the Electromagnetic Spectrum with by Austin Richards

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 capacity to 'see' invisible gentle. Dozens of colourful photographs and transparent, concise descriptions make this an exciting, available technical publication. Richards explains the sunshine spectrum, together with obvious gentle, and describes the complicated imaging applied sciences that let people to synthesize our personal model of 'alien' imaginative and prescient at various wavelengths, with purposes starting from fireplace struggling with and legislation enforcement to botany and medicine.

Contents

- checklist of Figures

- Preface

- creation

- Infrared and Ultraviolet: the sides 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

- Epilogue

- thesaurus

- Bibliography and net assets

- Index

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Extra info for Alien Vision: Exploring the Electromagnetic Spectrum with Imaging Technology

Sample text

22 is an image of the moon made by the SPIRIT III telescope on the MSX (Midcourse Space Experiment) satellite during the total lunar eclipse in September of 1996. The image has red pseudocolor added, where the lighter the shade of red, the higher the surface temperature. SPIRIT stands for Spatial Infrared Imaging Telescope, an instrument that has, among other sensors, an infrared imager consisting of a scanned array of silicon detectors in a cryostat cooled with solid hydrogen. 29 µm. Note the white circular “hot spots” on the surface.

Midwave and Longwave IR Imaging Systems As we try to image the world around us with electromagnetic energy that departs significantly from the wavelength range of visible light, we can no longer use ordinary cameras with special films and filters to make images as we could in the near-infrared and near-ultraviolet bands. The imaging devices we need still use lenses, but these lenses are made of special materials (such as silicon and germanium) that have different optical properties from those of glass.

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. 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.

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