DeaconTheVillain Posted October 4, 2011 Share Posted October 4, 2011 The single-beam mirage effect, also known as photothermal deflection, is studied using a free-standing, highly aligned carbon nanotube aerogel sheet as the heat source. The extremely low thermal capacitance and high heat transfer ability of these transparent forest-drawn carbon nanotube sheets enables high frequency modulation of sheet temperature over an enormous temperature range, thereby providing a sharp, rapidly changing gradient of refractive index in the surrounding liquid or gas. The advantages of temperature modulation using carbon nanotube sheets are multiple: in inert gases the temperature can reach > 2500 K; the obtained frequency range for photothermal modulation is ~ 100 kHz in gases and over 100 Hz in high refractive index liquids; and the heat source is transparent for optical and acoustical waves. Unlike for conventional heat sources for photothermal deflection, the intensity and phase of the thermally modulated beam component linearly depends upon the beam-to-sheet separation over a wide range of distances. This aspect enables convenient measurements of accurate values for thermal diffusivity and the temperature dependence of refractive index for both liquids and gases. The remarkable performance of nanotube sheets suggests possible applications as photo-deflectors and for switchable invisibility cloaks, and provides useful insights into their use as thermoacoustic projectors and sonar. Visibility cloaking is demonstrated in a liquid. http://iopscience.iop.org/0957-4484/22/43/435704 Link to comment Share on other sites More sharing options...
Reic Posted October 4, 2011 Share Posted October 4, 2011 http://iopscience.iop.org/0957-4484/22/43/435704 So if one is looking at the object straight on, would they just see a reflection of themselves? Thats what I take from this. Link to comment Share on other sites More sharing options...
HOF44 Posted October 4, 2011 Share Posted October 4, 2011 I need Kdawg to explain this to me. Link to comment Share on other sites More sharing options...
Unforgiven Posted October 4, 2011 Share Posted October 4, 2011 What will those muggles think of next? Link to comment Share on other sites More sharing options...
PokerPacker Posted October 4, 2011 Share Posted October 4, 2011 I believe this uses refraction rather than reflection. I would have liked the video to explain the setup a bit more. Also I doubt its pure happenstance that we're shown the object at such a severe angle. Probably take a lot of research before we can get something that works more straight-on. Cool, none-the-less Link to comment Share on other sites More sharing options...
Reic Posted October 4, 2011 Share Posted October 4, 2011 I believe this uses refraction rather than reflection. I would have liked the video to explain the setup a bit more. Also I doubt its pure happenstance that we're shown the object at such a severe angle. Probably take a lot of research before we can get something that works more straight-on. Cool, none-the-less Yeah I read it was based on refraction,, guess you have to be at the right angle in that case Link to comment Share on other sites More sharing options...
DCSaints_fan Posted October 4, 2011 Share Posted October 4, 2011 This is a far cry from an invisibility cloak - its a material that can become transparent in response to an external stimuli. But it won't 'cloak' anything behind it, its only cloaking itself. Link to comment Share on other sites More sharing options...
PokerPacker Posted October 4, 2011 Share Posted October 4, 2011 This is a far cry from an invisibility cloak - its a material that can become transparent in response to an external stimuli. But it won't 'cloak' anything behind it, its only cloaking itself. I believe what you are describing is more of an electrochromic glass. Link to comment Share on other sites More sharing options...
KDawg Posted October 5, 2011 Share Posted October 5, 2011 I need Kdawg to explain this to me. Let me take a stab at this one guys, I got it. You see... You take the discumbobulator and merge it with the tinkergadget and you come up with a perfectly suitable thingamagigawhat. You're welcome. Link to comment Share on other sites More sharing options...
IONTOP Posted October 5, 2011 Share Posted October 5, 2011 This should help some... http://sports.yahoo.com/mlb/news?slug=jp-passan_pujols_cardinals_phillies_nlds_100311 In the St. Louis Cardinals’ dugout, they like to joke about Albert Pujols’(notes) invisibility cloak. Link to comment Share on other sites More sharing options...
China Posted March 7, 2012 Share Posted March 7, 2012 I don't think these guys thought this through very well. "I know, let's make a car invisible!" "Great, now nobody can see us coming down the road and will run into us. We're sure to get into a crash then. Brilliant!" :doh: Gone in less than 60 seconds! Engineers use LEDs and a camera to create an 'invisible' Mercedes (but they might need to work on the wheels) Link to comment Share on other sites More sharing options...
Bang Posted March 7, 2012 Share Posted March 7, 2012 I saw something similar to this about 2 years ago.. the Brits were testing it in hiding tanks for ambushes. Looked pretty cool. Superheroes are coming, folks. And I'm not joking in the slightest. ~Bang Link to comment Share on other sites More sharing options...
PokerPacker Posted March 7, 2012 Share Posted March 7, 2012 I saw something similar to this about 2 years ago.. the Brits were testing it in hiding tanks for ambushes. Looked pretty cool.Superheroes are coming, folks. And I'm not joking in the slightest. ~Bang I believe the one with the tanks involved a projector, like this: JKPVQal851U Link to comment Share on other sites More sharing options...
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