what is black? stephen m. pompea national optical astronomy observatory tucson, arizona usa stephen...
Post on 23-Jan-2016
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Dark Night Skies:Kitt Peak and the Tohono OOdham Nation
This space telescope is not working as well as we would like!
Spitzer Space Telescope in the Clean Room
Spitzer Infrared Space Telescope
Why do we need black surfaces?Is black a color?How do we make something become black?Examples of black surfacesDesigning surfaces--micro-architect?
Overview of Talk
Is Black a Color?Yes, but .Black depends on light levelsWe can measure blackness
Kinds of Surfaces-vocabularyDiffuse (rough)Specular (smooth)They reflect light very differently!
Reflections are everywhere--even glass lenses reflect
Coatings are important for telescopes
Painted Surface Up Close
Tungsten Hexafluoride(Grown surface)
Etched Surface (nickel)
Cross sectional view of surface
Anodized Surface (Martin Black)
How things look depends on the wavelength
Graphs Speak to You!
New Surface for Absorbing
What is black?Non-reflective and absorptiveBlack is related to wavelengthSpecular black surfaces and diffuse black surfacesSurfaces roughness helps make a surface black
Come Visit Kitt Peak!
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