What is Black? Stephen M. Pompea National Optical Astronomy Observatory Tucson, Arizona USA Stephen...
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NOAO Public Affairs and Educational Outreach
What is Black?What is Black?What is Black?What is Black?
Stephen M. PompeaStephen M. Pompea
National Optical Astronomy ObservatoryNational Optical Astronomy Observatory
Tucson, ArizonaTucson, Arizona
USAUSA
Stephen M. PompeaStephen M. Pompea
National Optical Astronomy ObservatoryNational Optical Astronomy Observatory
Tucson, ArizonaTucson, Arizona
USAUSA
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Dark Night Skies:Dark Night Skies:Kitt Peak and the Tohono Kitt Peak and the Tohono O’Odham NationO’Odham Nation
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“This space telescope is not working as well as we would like!”
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Spitzer Space Telescope in the Clean RoomSpitzer Space Telescope in the Clean Room
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Spitzer Infrared Space TelescopeSpitzer Infrared Space Telescope
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Overview of TalkOverview of Talk
• Why do we need black surfaces?• Is black a color?• How do we make something become “black”?• Examples of black surfaces• Designing surfaces--micro-architect?
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Is Black a Color?Is Black a Color?
Yes, but ….Yes, but ….
Black depends on light levelsBlack depends on light levels
We can measure “blackness”We can measure “blackness”
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Kinds of Surfaces-vocabulary
• “Diffuse” (rough)• “Specular” (smooth)
They reflect light very differently!They reflect light very differently!
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Reflections are everywhere--even glass lenses reflect
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Coatings are important for telescopesCoatings are important for telescopes
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Painted Surface Up Close
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Tungsten Hexafluoride(Grown surface)
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Etched Surface (nickel)
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Cross sectional view of surface
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Anodized Surface (Martin Black)
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How things look depends on the wavelength …How things look depends on the wavelength …
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Graphs Speak to You!
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New Surface for Absorbing
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What is black?
• Non-reflective and absorptive• Black is related to wavelength• Specular black surfaces and diffuse black
surfaces• Surfaces roughness helps make a surface
black
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Come Visit Kitt Peak!