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Thread: Invisible Cloak

  1. #1

    Default Invisible Cloak

    Share with you some news of exciting new tech

    we need next generation camera to emit electron or radiation for detection of objects in the near future....because some things become invisible as light can pass through them without reflecting any. So we cannot capture them with camera anymore. Optics will become a thing of past.

  2. #2

    Default Re: Invisible Cloak

    The newspapre/site name, 'Pravda' translates to english as 'Truth'. Believe-it-or-not - I won't until i see it, don't see it in this cae, with my own eyes.

  3. #3
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    Default Re: Invisible Cloak

    From my understanding of the article, the new technology simple means that the object does not reflect any light to the viewer. I don't see how that is going to make the object invisible.

    If a object doesn't reflect any light, we will just see it as a black object. For it to be truly invisible, the object has to blend into the background ie; reflected lights from objects in the background has to pass through (or at least go round the object) to reach the viewer's eyes.

    So the problem at hand is how to make light rays pass through the object, and not the scattering of light on the surface of the object.
    At least that's what seem logical to me.

  4. #4

    Default Re: Invisible Cloak

    canon website has some good eduction about physics of light...hopefully we can witness some new technology breakthrough soon and survive from drastic social restructure

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    Default Re: Invisible Cloak

    The closest thing to a thermoptic camouflage is still the X'tal Vision project by the cool guys at Tokyo University. (It's cool how anime inspire people to make the technology possible!)

    http://projects.star.t.u-tokyo.ac.jp...DIA/xv/oc.html

  6. #6
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    Default Re: Invisible Cloak

    sound like Metal Gear Solid in the making... Solid Snake anyone?
    Logging Off. "You have 2,631 messages stored, of a total 400 allowed." don't PM me.

  7. #7

    Default Re: Invisible Cloak

    Quote Originally Posted by Prismatic
    From my understanding of the article, the new technology simple means that the object does not reflect any light to the viewer. I don't see how that is going to make the object invisible.

    If a object doesn't reflect any light, we will just see it as a black object. For it to be truly invisible, the object has to blend into the background ie; reflected lights from objects in the background has to pass through (or at least go round the object) to reach the viewer's eyes.

    So the problem at hand is how to make light rays pass through the object, and not the scattering of light on the surface of the object.
    At least that's what seem logical to me.
    we will not see a black object but we can see thing around it that reflects light. The explanation is correct. You might be confused with Black hole as there are lights around the it appears as hole.

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    Default Re: Invisible Cloak

    Quote Originally Posted by SnakeJackal
    we will not see a black object but we can see thing around it that reflects light. The explanation is correct. You might be confused with Black hole as there are lights around the it appears as hole.
    I don't think so. When light falls on an object, it is either, reflected, absorbed or transmitted. If according to the article, the light is not reflected, then it must be either absorbed or transmitted through the object. So unless a viewer can see the light rays from the things behind the object (as the light is transmitted through the object), it means the object is absorbing all the light. So we will see it as a black object against a background.

    Granted that according to the technology, we won't be able to 'see' it in a technical sense, since no light rays is reflected from the object.But it will not be invisible as in see-thru because it's still blocking out light rays from the background.
    Last edited by Prismatic; 6th February 2006 at 12:14 PM.

  9. #9

    Default Re: Invisible Cloak

    this techniques require spherical/cylindrical shape where light pass through the objects. This resembles the UFO shapes ... we cannot see it even it is around us and motionless. But as it moves we see them. "The frequency of radiations change in moving objects, and therefore it’s impossible to keep them invisible"

  10. #10

    Default Re: Invisible Cloak

    Quote Originally Posted by Prismatic
    So unless a viewer can see the light rays from the things behind the object (as the light is transmitted through the object), it means the object is absorbing all the light. So we will see it as a black object against a background.
    Possibly the object absorb the light but relay it on the structure within it and release all on the other side without any deviation/distortion and even same amount of energy. Thus it will still appear invisible.

  11. #11

    Default Re: Invisible Cloak

    Quote Originally Posted by SnakeJackal
    Possibly the object absorb the light but relay it on the structure within it and release all on the other side without any deviation/distortion and even same amount of energy. Thus it will still appear invisible.

    Currently that is not possible. You need a material that is able to calculate the ever changing of frequency of light (reflected and refracted) from all angles. For plasmons to appear "invisble" , you need to have particles that is able to manipulate the "individual" wavelenght (of visbile spectrum of light wavelehgt). Etc, now we have lead sulfide (PbS) nanocrystals that is able to make certain wavelength - infra red, invisible, but not all wavelength.

    It is most likely that "patent" as indicated in the article, will make an object less visible (etc from radar), rather than totally invisible. We are moving into that, however, we are still generations away from there. I have serious doubt on the article patent's claim.

    I think this discussion should be under "Kopitiam"
    Last edited by kitkat; 6th February 2006 at 01:51 PM.

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    Default Re: Invisible Cloak

    To be sure, I'm not going dispute the authencity of the article, since it's impossible and pointless anyway. But I would say, take it with a bit of salt. For a few reasons, some aspect of the article is slightly questionable.

  13. #13

    Default Re: Invisible Cloak

    back to physics

  14. #14

    Default Re: Invisible Cloak

    Quote Originally Posted by kitkat
    Currently that is not possible. You need a material that is able to calculate the ever changing of frequency of light (reflected and refracted) from all angles.
    you are right. I guess the method depends on the intensity of light and cannot completely filter off 100% light spectrum. The method is only able to hide motionless objects and poosibly reduce the visibility to very low.

    Actually we have already a material that is invisible. Glass can consider as almost invisible, isn't it?

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    Default Re: Invisible Cloak

    Quote Originally Posted by SnakeJackal
    Possibly the object absorb the light but relay it on the structure within it and release all on the other side without any deviation/distortion and even same amount of energy. Thus it will still appear invisible.
    you must be joking. I haven't heard of how applying a coating on an object can allow the photons to channel (tunnel) thru the object relaying info from behind to front.

    I agree with primatic more. it'll be like if i had a ball coated with that 'thingy' it should look like this
    “How fortunate for leaders that men do not think.” - Adolf Hitler

  16. #16

    Default Re: Invisible Cloak

    Pravda was the Communist Party of USSR's catalyst paper, used to be state-controlled, sort of a propaganda tool.

  17. #17

    Default Re: Invisible Cloak

    Quote Originally Posted by Slivester
    Pravda was the Communist Party of USSR's catalyst paper, used to be state-controlled, sort of a propaganda tool.
    The catalyst really can stir up things the impact is really strong

  18. #18

    Default Re: Invisible Cloak

    Quote Originally Posted by yanyewkay
    you must be joking. I haven't heard of how applying a coating on an object can allow the photons to channel (tunnel) thru the object relaying info from behind to front.

    I agree with primatic more. it'll be like if i had a ball coated with that 'thingy' it should look like this
    I think it is hard for even proffessional to give good explanation. There is a condition for the coating to works as explain in the articles. You cannot just coat any object anyhow.

  19. #19

    Default Re: Invisible Cloak

    another confirmation ..... i know many of you would like to own one

  20. #20

    Default Re: Invisible Cloak

    Read this week's economist magazine.Under the science section, there is a in depth explaination of the invisible cloak.

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