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Thread: Cloak of Invisibility

  1. #1 Cloak of Invisibility 
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    They are definitely thinking about it.

    http://www.foxnews.com/story/0,2933,197026,00.html


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  3. #2  
    Forum Professor Pendragon's Avatar
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    Sounds funny, although I really wonder what this 'cloaking device' would look like. The article explains what the effect will be, but not what kind of machine they would need for it.

    But maybe it's also possible to hide things or even persons in easier ways. For example, I've seen movies of a Japanese inventer who just projected on his body the images you would see if you could look through him. So you need camera's on all sides, the images of which you then display on the other side of the body. Then it'll only be a question of the quality of the images whether the person becomes invisable or not.


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  4. #3  
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    Maybe the use of retro-reflective material: http://science.howstuffworks.com/inv...ity-cloak3.htm

    Similar to this maybe but on a bigger scale.
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  5. #4  
    Forum Professor Pendragon's Avatar
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    Ah yes, that's what I mean. Those images look so cool :-D

    I guess for persons this is all a bit dificult, with heavy gear or fixed set-ups needed. But for large vehicles or airplanes this could work very well. Imagine a big airplane flying around like a chameleon, projecting blue sky or darkness on itself. Would be very good camo from a distance. Or you could completely camouflage a building with it, by projecting images of something else on it (for example projecting images of normal houses on a military installation).
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    there is of course the problem of a low flying dare devil pilot who kamakazies into your building.

    thats why i reackon some of this is a bad idea.

    but that and the plane might only have that invisibility in one range of spectra. others like thermal might be a bit more difficult to sensor. that and if you were to mae yourself invisible to thermal you'd still show up like a black object in a white room.

    long way to go yet.
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  7. #6  
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    Quote Originally Posted by wallaby
    . that and if you were to mae yourself invisible to thermal you'd still show up like a black object in a white room.
    Yes, that, and die. If you did not produce IR energy at all, your body would overheat, the enzymes in your brain would denature and you would die a rather painful death.
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  8. #7  
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    No, what he means is if you put heat-reflecting material on your aircraft then it would be relatively 'invisible' in thermal
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  9. #8  
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    Quote Originally Posted by Hazz
    No, what he means is if you put heat-reflecting material on your aircraft then it would be relatively 'invisible' in thermal
    That's not the way Infrared works, it works by detecting the infrared signature of the plane, that is, the engine heat, you can reduce it (by mixing it with cool air, or shield hot components but the heat they produce still has to leave the craft, you cannot eliminate it.
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  10. #9  
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    Oh, right. I was just guessing. I stand corrected.

    (unless you put a layer of vacuum around the plane?)
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  11. #10  
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    Quote Originally Posted by Hazz
    Oh, right. I was just guessing. I stand corrected.

    (unless you put a layer of vacuum around the plane?)
    Then the plane would fall out of the sky, you dumbass ! :wink:
    The hand of time rested on the half-hour mark, and all along that old front line of the English there came a whistling and a crying. The men of the first wave climbed up the parapets, in tumult, darkness, and the presence of death, and having done with all pleasant things, advanced across No Man's Land to begin the Battle of the Somme. - Poet John Masefield.

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  12. #11  
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    *mumbles angrily*
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  13. #12  
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    Is there a way to shift the frequecy of light so that visible light momentarily becomes radio-waves before it hits you and returns to visible light when it leaves?

    Or a way to shift IR waves (or Radar) around a ship or vehicle into UV light? It would make a ship harder to detect for older generation missiles.


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  14. #13  
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    No.
    The hand of time rested on the half-hour mark, and all along that old front line of the English there came a whistling and a crying. The men of the first wave climbed up the parapets, in tumult, darkness, and the presence of death, and having done with all pleasant things, advanced across No Man's Land to begin the Battle of the Somme. - Poet John Masefield.

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  15. #14  
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    The article was talking about left-handed metamaterials aka metamaterials with negative refractive index.

    They essentially "lead" photons inside of them like water in a pipe and so can collect photons before an object, drive them along their inner structure and around the object and release them behind the object in the same direction they were traveling -so photons "take a detour" within the metamaterial and if the metamaterial is around the object, like wrapping it, then photons will effectively miss the object and wll be forced to "detour" around it.

    A left-handed metamaterial is a sort of "light conductor" but they're not conductors; they just "push" the photons along their structure since they enter and until they leave.
    “If the misery of the poor be caused not by the laws of nature, but by our institutions, great is our sin.” -Charles Darwin
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  16. #15  
    Forum Ph.D. streamSystems's Avatar
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    FOX, if anyone has bothered to spend enough time to watching that stuff, is very........well, they want Darth as their CEO..........understandably so............just calculate that in to your answers.

    FOX "needs" a leader..........I think someone with more KNOW-HOW than the US MILITARY, right?
    Does a theory of everything therefore need to be purely theoretical and only account for the known laws and forces in handling the improbability of fortune telling?

    the www feature below can explain it better.
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