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Thread: 3 D Holographs

  1. #1 3 D Holographs 
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    How is the holographic effect achieved? all I know is that lasers are used, but I don't know how.


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    Pritish
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  3. #2  
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    Doesn't ANYBODY care to answer?


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  4. #3  
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    Sorry I don't know the answer. I suppose it could be theoretically possible using special light bending but I don't think we're anywhere near a 3D projection yet. We've yet to master bending microwaves before we move to visible light.
    "If you wish to make an apple pie from scratch, you must first invent the universe". - Carl Sagan
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  5. #4  
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    Basic answer:

    Take a laser, split into two beams, which are then use to illuminate an object from two directions. The Laser light that reflects off of the object forms an interference pattern which is captured on photographic film.

    This is the hologram. If you then shine a duplicate laser through the hologram, you will reproduce an image of the original object, in 3D.
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  6. #5 Re: 3 D Holographs 
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    Quote Originally Posted by PritishKamat
    How is the holographic effect achieved? all I know is that lasers are used, but I don't know how.

    Water vapor usually, in the dark. And laser projection systems, that overload the water vapor just like a laser. And make it hard to see through. If you filter out the bright light you can still see through the holographs though.




    These two pictures are of the same thing, just filmed from two opposite sides. The one that lets you see what is taking place at the core, is done with a filter. But you can see that our eyes are just blinded by the light. There is a total picture behind all that very, very bright light.

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  7. #6  
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    Water vapor usually, in the dark. And laser projection systems, that overload the water vapor just like a laser. And make it hard to see through.
    I didn't get this. Please explain to me what water vapor has to do with holograms
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    Quote Originally Posted by PritishKamat
    Water vapor usually, in the dark. And laser projection systems, that overload the water vapor just like a laser. And make it hard to see through.
    I didn't get this. Please explain to me what water vapor has to do with holograms
    Moist air or fog, is a target easily excited by light.

    Have you ever seen fog roll in, after dark. Or before sunup? It is highly visible, even in a dim light.
    It is what I would call opaque. So when a laser projector hits it, it lights up so bright that you cannot see what is behind it without a filter.

    Now if you have multiple projectors and you cross beams at a focal point, you can create a very real looking, strangely lit object, especially in very moist or fog like conditions.

    Disney, MGM has a show, but I did not bother to stay for it. They say it is cool. Unless it is a seen with law makers getting expelled from Washington they can keep it.

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  9. #8  
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    could you please stop feeding people crap from your bottomless pile of bullshit?
    when you have eliminated the impossible, whatever remains, however improbable, must be the truth
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  10. #9  
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    Quote Originally Posted by dejawolf
    could you please stop feeding people crap from your bottomless pile of bullshit?
    Easy now, the man speaks truth. Look up the IO2 Holographic Display:

    Designer Chad Dyner revealed that the holographic device works on the principal of projecting an image onto a cloud of microscopic particles, presumably water-based vapor, which is created using proprietary thermodynamic process.
    The hologram that Janus referred to and the one William mentioned are two different things. Janus' is a static photograph of sorts which you've undoubtedly seen before:



    William's is an actual laser projection into space:

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  11. #10  
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    What Frenchi says is correct. In my opening post, I was referring to holographic stickers ( sorry, I didn't make it clear ). but Janus answered it pretty clearly and the picture in Frenchi's post didn't leave any room for doubt! :-D

    Quote Originally Posted by William McCormick
    Have you ever seen fog roll in, after dark. Or before sunup? It is highly visible, even in a dim light.
    It is what I would call opaque. So when a laser projector hits it, it lights up so bright that you cannot see what is behind it without a filter.
    William, I think what you're referring to is the Tyndall effect.
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  12. #11  
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    oh sorry. its just that usually he talks complete horseshit, especially when it comes to military technology or electricity.
    when you have eliminated the impossible, whatever remains, however improbable, must be the truth
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    Quote Originally Posted by dejawolf
    oh sorry. its just that usually he talks complete horseshit, especially when it comes to military technology or electricity.

    Could you state one of these things which are not real? I would like a chance to defend myself.

    From what I have seen and have tested, I don't know what weapon I could say existed, that did not.



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  14. #13  
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    Quote Originally Posted by dejawolf
    oh sorry. its just that usually he talks complete horseshit, especially when it comes to military technology or electricity.
    Well, mostly he does! (no offense William). But he's quite right in stating that example of the fog, since tyndall effect is often used to create 3D images in mid-air.
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  15. #14  
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    By the way, I was wondering if the same technology is used for making 3D images within glass cubes (I can't explain very clearly, sorry )
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  16. #15  
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    Quote Originally Posted by PritishKamat
    Quote Originally Posted by dejawolf
    oh sorry. its just that usually he talks complete horseshit, especially when it comes to military technology or electricity.
    Well, mostly he does! (no offense William). But he's quite right in stating that example of the fog, since tyndall effect is often used to create 3D images in mid-air.

    Without fog or moisture, the effects are rather disappointing.


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  17. #16  
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    in glass they just use lasers to set up a reaction inside the glass cube. the product will be white/different phase/whatever then the glass and so the light will be differently passed through.
    I know I can't explain it very clearly, English is after all a second language for me..
    “The wireless telegraph is not difficult to understand. The ordinary telegraph is like a very long cat. You pull the tail in New York, and it meows in Los Angeles. The wireless is the same, only without the cat.” - Albert Einstein
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