Read e-book online Alien vision : exploring the electromagnetic spectrum with PDF

By Austin Richards

Austin Richards takes readers on a visible travel of the electromagnetic spectrum past the variety of human sight, utilizing imaging know-how because the potential to 'see' invisible gentle. Dozens of colourful photos and transparent, concise descriptions make this an exciting, available technical e-book. Richards explains the sunshine spectrum, together with noticeable gentle, and describes the complex imaging applied sciences that let people to synthesize our personal model of 'alien' imaginative and prescient at diversified wavelengths, with functions starting from hearth combating and legislation enforcement to botany and medicine.

Contents

- checklist of Figures

- Preface

- advent

- Infrared and Ultraviolet: the sides of the Rainbow

- Thermal Imaging: all of us Glow at midnight

- 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

Example text

When you turn on an electric stove burner, the heating element appears black at first. 25 Composite visible and UV (240–280 nm) image of power line corona. , Nes-Ziona, Israel) gradually becomes reddish-orange. If we could keep heating the element, it would glow with yellow light, and finally would appear white-hot to our eyes (then the kitchen would burn up). Reversing this process, we arrive back at the dull red glow that gradually disappears as the burner cools. The burner would still be emitting near-IR light.

The membranes contain two large branches of the trigeminal nerve (one of the cranial nerves) that are fanned out across the surface of the membrane. These nerves respond to minute temperature changes of the membranes, which can be induced by the presence of a warm-blooded animal in front of the snake’s head. 5 The membranes serve as platforms for the nerves, and the platforms have a large surface area and low thermal mass, making them very sensitive to changes in infrared intensity. Each pit has a field of sensitivity that overlaps the other slightly, and the snake can tell when the prey is directly in front of its head because the two pits will generate approximately equal thermal signals in each pit.

However, these same finger oils are very reflective to near-UV light, and this property can be exploited to detect fingerprints on nonporous surfaces. 13 shows a magazine cover imaged in visible light as well as a magnified view of an area of the magazine imaged in both visible and near-UV light. The red box superimposed on the magazine cover shows the area with the fingerprints. Finger oils are so reflective in the near-UV that the fingerprints appear to be made with white paint. These images were taken with an electronic viewing scope and a UV light source that illuminated the magazine with 254-nm light.

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