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Thread: Hologram

  1. #1 Hologram 
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    What is holding a hologram together? The question is not how it is made but what is in the physical space occupied by the hologram made of? Is it strictly photons and what is holding them in place while still moving?


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    Are you talking about real life holograms or something like Star Trek's holodeck? Real life holograms are not photons floating in the air. They are pieces of material that cause scattered light to make interesting illusions.


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    Real life holograms. So if is scatered light off real material in the atmosphere like dust particles and so on, what would happen if we project the image in total vacuum or space. I think it still would work? I'm really interested in the underlying principle of the inside of real three dimensional hologram only. I have a reason for asking this question, unfortunatelly I couldn't find any satisfactory answer on the net. I'm not looking for mathematical explanation (I understand there is no working model of the phenomenon out there yet).
    Thanks for any info I can get.
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  5. #4  
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    When you say hologram, I don't think you mean the same thing as everyone else. In real life, a hologram is a piece of plastic made in a specific way so that when light shines on it, the reflected light generates an angle dependent image. (Some may use refracted light instead of reflected light.)

    You can't project an image onto a vacuum. The only way we see something is when light bounces off of it and enters our eyes. There's nothing in a vacuum to bounce off of.
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  6. #5 Re: Hologram 
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    Quote Originally Posted by varadinum
    What is holding a hologram together? The question is not how it is made but what is in the physical space occupied by the hologram made of? Is it strictly photons and what is holding them in place while still moving?
    The hologram itself is just and interference pattern of electromagnetic waves -- light. The photons are not being held in place. They are moving at the speed of light.
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  7. #6  
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    Quote Originally Posted by MagiMaster
    When you say hologram, I don't think you mean the same thing as everyone else. In real life, a hologram is a piece of plastic made in a specific way so that when light shines on it, the reflected light generates an angle dependent image. (Some may use refracted light instead of reflected light.)

    You can't project an image onto a vacuum. The only way we see something is when light bounces off of it and enters our eyes. There's nothing in a vacuum to bounce off of.
    I probably didn't convey my question clearly. What I'm asking is: what is inside a hologram not the illusion of it, not the two dimensional form of it and not how is made. I have the idea already. What is holding the actual three dimensional, moving hologram together from inside- out? Not from outside, from inside. If you go to utube and look up the first broadcast hologram of CNN and subsequently some other ones on IPods, I hope you understand what my question is. These images mentioned are not tangible but are real and occupy space like it or not. The image can be moved, turned, filmed, lifted, sized to different proportions and so on.... but is undeniably there. The notion or premise that is just scattered light from material in the air is ridiculous. You can't blow it away by high compression air, so I think you can reproduce it in vacuum or space. I'm asking this question again for a purpose and since I can't find anything remotely explaining this on the net, I posted it here in hope of maybe somebody have the same incline and some idea how to explain it. Thanks.
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  8. #7  
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    DrRocket already gave you the answer. There is nothing tangible in a hologram. The photons keep going (otherwise you wouldn't see them because they wouldn't reach your eyes). As soon as you turn off the light source (usually a laser, IIRC), the hologram disappears.
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  9. #8  
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    Quote Originally Posted by varadinum
    If you go to utube and look up the first broadcast hologram of CNN and subsequently some other ones on IPods, I hope you understand what my question is. These images mentioned are not tangible but are real and occupy space like it or not. The image can be moved, turned, filmed, lifted, sized to different proportions and so on.... but is undeniably there.
    I hate to burst your bubble, but those "holograms" were digital trickery. If you had been standing in the studio, you wouldn't have seen anything at all. There was nothing actually there. We can't produce real volumetric holographic images yet.
    "Men are apt to mistake the strength of their feelings for the strength of their argument.
    The heated mind resents the chill touch & relentless scrutiny of logic"-W.E. Gladstone


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  10. #9  
    Forum Professor marcusclayman's Avatar
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    You can't find any information anywhere on this?

    Have you tried doing a search? here are some results

    http://science.howstuffworks.com/hologram.htm
    http://en.wikipedia.org/wiki/Holography
    http://www.eskimo.com/~billb/amateur/holo1.html

    you now owe me 38.6428 seconds of your life.
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  11. #10  
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    Quote Originally Posted by Janus
    Quote Originally Posted by varadinum
    If you go to utube and look up the first broadcast hologram of CNN and subsequently some other ones on IPods, I hope you understand what my question is. These images mentioned are not tangible but are real and occupy space like it or not. The image can be moved, turned, filmed, lifted, sized to different proportions and so on.... but is undeniably there.
    I hate to burst your bubble, but those "holograms" were digital trickery. If you had been standing in the studio, you wouldn't have seen anything at all. There was nothing actually there. We can't produce real volumetric holographic images yet.
    Thanks Janus:
    We can't produce real volumetric holographic images yet.
    I was not actually forthcoming about my reasons to ask the question. I got your answer to my satisfaction on my highlighted words in the last quote.. You have gasped my meaning of the question in a very few words, which will save me a lot of time looking in the wrong direction. Thanks again and thank you all for responding.
    I still owe you guys the reason I'm asking this question:
    Why is any part (no matter how small) of the "hologram" holds the "information" of the whole holographic virtual "image"?
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  12. #11  
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    Quote Originally Posted by marcusclayman
    you now owe me 38.6428 seconds of your life.
    Thanks. You didn't answer my question but I appreciate your time. I will pay you $20.00/h. At this rate I owe you approx. $0.2148. Let's make it even 25 cents.
    Let me know where to send the funds.
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  13. #12  
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    Those aren't real.
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  14. #13  
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    There are two meanings to the word hologram.

    The first meaning is "a piece of plastic that causes reflected/refracted light to create angle-dependent images." That angle dependence is often used to make images that appear 3D. Close one eye and hold very still. You are seeing a 2D image. The two things that gives the illusion of depth is having two eyes (stereoscopy) and moving around a little (parallax). The angle dependence is sometimes used to create images that change as you pass by instead. The photons simply pass through or bounce off of the plastic in such a way that you see things in it.

    The second meaning is "illusory 3D objects," or volumetric holograms. That would be things like the holodeck on Star Trek (ignoring the sense of touch for the moment). Those don't exist and as far as we know are pure sci-fi. With nothing for the photons to bounce off of or refract through, there's no way to create such patterns. Even if such things existed, the photons would not be part of the hologram, just like they aren't part of anything else you see. Currently, the closest we can get would be Augmented Reality, which involves wearing VR goggles that let you see computer images as well as the real world.
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  15. #14  
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    well, any material can be used to make a hologram, it is not the material that matters, but the print.

    For example the "magic eye" books, are holograms. Those are paper printed with ink. The difference is that instead of reflecting the image towards both of your eyes in such a way it gives the illusion of depth, your eyes change direction until the image becomes visible.

    Every part only seems to contain all the information of the whole holograph, but it is not actually the case. The image is placed randomly all over the holograph, the inconsistencies are the size of the distance between photons, and our eyes aren't capable of seeing them.

    There are different holographs, some of which require special lighting to see(such as 3d glasses), some of which require the viewer to look at them right(magic eye books)


    And just to let you know, I wasn't trying to answer your question, I was trying to provide links so that you could learn about the subject for yourself. You said you did a search but couldn't find information, despite there being much of it available with a simple search. If the links I provided were too simplistic, then you can search googlescholar or eccello science to find actually studies.

    if you don't know the terminology, Wikipedia "holography" might reveal the terminology you need to do more precise search for a study on the principle you are wondering about.
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  16. #15  
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    Thanks for the replys.
    I'm not fixated on holograms. I pretty much know how they work and I looked up many aspects of it. I had the impression that volumetric holographic images are real. Janus answered my question, so now I know that they are just illusions and that's good enough. It was a small part of research project not closely related to holograms. Thanks again everyone and I consider the subject closed.
    Sometimes. ignorance is a blessing and genius is a crime.
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    Are you talking about the soul i.e. denser or transparent?
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    1. Height
    2. Width
    3. Depth
    4. Now you see it, now you don’t
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    Gravity is the 4th dimension.
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    Dark Matter is Super Gravity (The 5th dimension)

    Dark Energy is Ultimate Gravity (The 6th dimension)

    Space has only 6 dimensions.

    Null is the 7th dimension; Null is nothing; the 7th dimension doesn’t exist, literally.
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  21. #20  
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    Quote Originally Posted by Superheavyweight
    Dark Matter is Super Gravity (The 5th dimension)

    Dark Energy is Ultimate Gravity (The 6th dimension)

    Space has only 6 dimensions.

    Null is the 7th dimension; Null is nothing; the 7th dimension doesn’t exist, literally.
    I got my answer from inow. Yes, I was referring to density of space (without time).
    Neither space-time nor dimensions (other then three) are relevant to my question.
    Thanks.
    Sometimes. ignorance is a blessing and genius is a crime.
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  22. #21  
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    Quote Originally Posted by Superheavyweight
    Dark Matter is Super Gravity (The 5th dimension)

    Dark Energy is Ultimate Gravity (The 6th dimension)

    Space has only 6 dimensions.

    Null is the 7th dimension; Null is nothing; the 7th dimension doesn’t exist, literally.
    gibberish
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  23. #22  
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    Dick, be Frank.

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    Quote Originally Posted by varadinum
    Quote Originally Posted by Superheavyweight
    Dark Matter is Super Gravity (The 5th dimension)

    Dark Energy is Ultimate Gravity (The 6th dimension)

    Space has only 6 dimensions.

    Null is the 7th dimension; Null is nothing; the 7th dimension doesn’t exist, literally.
    I got my answer from inow. Yes, I was referring to density of space (without time).
    Neither space-time nor dimensions (other then three) are relevant to my question.
    Thanks.
    But all dimensions are within the same space, invisibility is the 4th dimension.
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  25. #24  
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    Quote Originally Posted by varadinum
    I got my answer from iNow. Yes, I was referring to density of space (without time).
    I believe credit would most accurately be directed toward Janus. :wink:
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  26. #25  
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    is the toilet bowl dimension ate...
    Dick, be Frank.

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  27. #26  
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    Quote Originally Posted by inow
    Quote Originally Posted by varadinum
    I got my answer from iNow. Yes, I was referring to density of space (without time).
    I believe credit would most accurately be directed toward Janus. :wink:
    Yes, sorry about that. Thank you Janus.
    Sometimes. ignorance is a blessing and genius is a crime.
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  28. #27  
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    Quote Originally Posted by Superheavyweight
    But all dimensions are within the same space, invisibility is the 4th dimension.
    What are you trying to prove here?
    If something is invisible in my experience, is because usually we can't see it. I also heard that some people are deaf.
    Sometimes. ignorance is a blessing and genius is a crime.
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  29. #28  
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    Silence is dimension b/s
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