1) What physically changes in the glass after writing/what are the physical properties of the stored interference pattern?
- are the glass atoms changed, rotated, re-ordered?
2) Does the thickness of the glass affect the max detail?
3) With one glass atom is a hologram possible to store on/in it?
4) What is the resolution of a one atom hologram would it be just one color from one or more perspectives?
5) When the glass is broken is there any change in the atoms of the remaining glass physically?
6) What allows/causes/interactions of the interference pattern at the same point in the glass after it is broken to now show a different perspective?
Thanks!
What physically changes in glass after writing?
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Holotron
What physically changes in glass after writing?
"The hologram is not an image, but an encoding system which enables the scattered light field to be reconstructed."
With this alone one may think that bits in the glass/film are organized like tiny prisms or diffractors.
These work together to scatter light in the way the original image did.
This makes sense and is easy to understand.
What gets confusing is this system is DYNAMIC
An addition to the above quote is:
The hologram is not an image, but a an encoding system which enables the scattered light field to be DYNAMICALLY reconstructed."
To elaborate when the glass is broken the only way that a point in the glass can adjust to showing a new perspective is if EVERYTHING in the whole picture is stored in EVERY atom.
This whole picture is a frequency. Adding more atoms allows the frequency to be more precise which gives one of the finite number of possible holograms which the glass is able to display.
Wiki:
Since each point in the hologram contains light from the whole of the original scene, the whole scene can, in principle, be reconstructed from an arbitrarily small part of the hologram.
To demonstrate this concept, the hologram can be broken into small pieces and the entire object can still be seen from each small piece. If one envisions the hologram as a "window" on the object, then each small piece of hologram is just a part of the window from which it can still be viewed, even if the rest of the window is blocked off.
One does, however, lose resolution as the size of the hologram is decreased—the image becomes "fuzzier." This is a result of diffraction and arises in the same way as the resolution of an imaging system is ultimately limited by diffraction where the resolution becomes coarser as the lens or lens aperture diameter decreases.
Souce:http://en.wikipedia.org/wiki/Holography
With this alone one may think that bits in the glass/film are organized like tiny prisms or diffractors.
These work together to scatter light in the way the original image did.
This makes sense and is easy to understand.
What gets confusing is this system is DYNAMIC
An addition to the above quote is:
The hologram is not an image, but a an encoding system which enables the scattered light field to be DYNAMICALLY reconstructed."
To elaborate when the glass is broken the only way that a point in the glass can adjust to showing a new perspective is if EVERYTHING in the whole picture is stored in EVERY atom.
This whole picture is a frequency. Adding more atoms allows the frequency to be more precise which gives one of the finite number of possible holograms which the glass is able to display.
Wiki:
Since each point in the hologram contains light from the whole of the original scene, the whole scene can, in principle, be reconstructed from an arbitrarily small part of the hologram.
To demonstrate this concept, the hologram can be broken into small pieces and the entire object can still be seen from each small piece. If one envisions the hologram as a "window" on the object, then each small piece of hologram is just a part of the window from which it can still be viewed, even if the rest of the window is blocked off.
One does, however, lose resolution as the size of the hologram is decreased—the image becomes "fuzzier." This is a result of diffraction and arises in the same way as the resolution of an imaging system is ultimately limited by diffraction where the resolution becomes coarser as the lens or lens aperture diameter decreases.
Souce:http://en.wikipedia.org/wiki/Holography
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JohnFP
What physically changes in glass after writing?
First, the interference pattern is recorded in some medium on the glass not the glass itself. Also, the interference pattern, which forms fringes lies within this medium an not within any glass atoms. What physically changes is silver grains turning black for silver halide holographic film and a change in index of refraction for DCG holographic film. There are other recoding mediums but you get the idea.
The part about each part of a hologram can contruct the whole image is a little misleading. Take a plain piece of glass and put an object behind it, say a little man. Make the little man as close to the glass as possible. Now put your eye, other the other side of the glass looking through the glass to the little man, right over his hand. You can see his hand, but can you see his foot, no. Same with a hologram. SO if you cut this hologram up the piece of hologram that saw his hand will not be able to reconstruct his foot. Now take the little man and put him about 1 meter behind the glass. Now place your eye at the stop where his hand was. You can see his hand and his foot, same as a hologram. If you cut this hologram in pieces you will see the entire little man but from a slightly different view. Each part of the hologram has to originally see each part on the object to be able to reconstruct it. Hope this was easy to understand.
John.
BTW, Welcome.
The part about each part of a hologram can contruct the whole image is a little misleading. Take a plain piece of glass and put an object behind it, say a little man. Make the little man as close to the glass as possible. Now put your eye, other the other side of the glass looking through the glass to the little man, right over his hand. You can see his hand, but can you see his foot, no. Same with a hologram. SO if you cut this hologram up the piece of hologram that saw his hand will not be able to reconstruct his foot. Now take the little man and put him about 1 meter behind the glass. Now place your eye at the stop where his hand was. You can see his hand and his foot, same as a hologram. If you cut this hologram in pieces you will see the entire little man but from a slightly different view. Each part of the hologram has to originally see each part on the object to be able to reconstruct it. Hope this was easy to understand.
John.
BTW, Welcome.
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a_k
What physically changes in glass after writing?
There are no "glass atoms", mate.
And what is your point, are you teaching or learning or simply trolling?
And what is your point, are you teaching or learning or simply trolling?
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Holotron
What physically changes in glass after writing?
Thanks so much John!
That is a great analogy.
Yes the misunderstanding is that the section where you see only hand may be broken and you would see the entire man in each of its sub-pieces.
If the piece broken off is the view of 'the hand' all of its broken pieces will be of the hand.
The cost of trading one big piece for many (information wise) is related to a loss in viewing angles?
That is a great analogy.
Yes the misunderstanding is that the section where you see only hand may be broken and you would see the entire man in each of its sub-pieces.
If the piece broken off is the view of 'the hand' all of its broken pieces will be of the hand.
The cost of trading one big piece for many (information wise) is related to a loss in viewing angles?
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Holotron
What physically changes in glass after writing?
Last edited by Holotron on Fri Oct 30, 2009 10:59 pm, edited 8 times in total.
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Holotron
What physically changes in glass after writing?
What are some keywords or phrases relating to how the smallest elements of the film are acting differently with light to display something different when the glass is broken-.
For instance a hologram with a blue background and white dot in the center broken into 4 even pieces will appear blue on the corner which made up 1/4 the white dot? and the white dot will not be in an area that looked blue before the glass was broken.
If you stuck bubblegum on the white dot it would be a blue corner after you broke it but the gum would be on the same spot.
Is that right?
If photons were baseballs and the elements of the film that capture the interference patterns were baseball catchers from outfield would it be the directions they face and angle they toss the balls that affect the image?
When the image is broken it appears we have established they (the analogical baseball catchers (which represent the film bits)) are not doing things differently so how the heck can that area display something different? Are the ridges basically many catchers at specific points which are only active during certain viewing angles?
For instance a hologram with a blue background and white dot in the center broken into 4 even pieces will appear blue on the corner which made up 1/4 the white dot? and the white dot will not be in an area that looked blue before the glass was broken.
If you stuck bubblegum on the white dot it would be a blue corner after you broke it but the gum would be on the same spot.
Is that right?
If photons were baseballs and the elements of the film that capture the interference patterns were baseball catchers from outfield would it be the directions they face and angle they toss the balls that affect the image?
When the image is broken it appears we have established they (the analogical baseball catchers (which represent the film bits)) are not doing things differently so how the heck can that area display something different? Are the ridges basically many catchers at specific points which are only active during certain viewing angles?
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wler
What physically changes in glass after writing?
"The cost of trading one big piece for many (information wise) is related to a loss in viewing angles?"
Yes.. think of a hologram as a little window out of your house; this is the easiest way to understand it. If it becomes smaller, your viewing angle becomes smaller, correspondingly.
Yes.. think of a hologram as a little window out of your house; this is the easiest way to understand it. If it becomes smaller, your viewing angle becomes smaller, correspondingly.
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Holotron
What physically changes in glass after writing?
Thanks Wler.
It sounds like each film may be different in this respect:
Logically portions of the film are acting as perspective based data OR portions of the film act holographically together to produce the image.
Case 1:
Interference patterns are stored on a one to one basis matching perspective.
At each point or minimum area in the film there must be eat least one element which stores one interference pattern for each perspective or re-creates more than one interference pattern from a single contant structure.
Case 2:
Oddly shaped light defractors exists at many points on a grid.
When light bounces through them they create a picture.
It is the holistic nature of these light effectors that recreate the picture.
They all communicate together. If you remove a square from the center of the film the remaining frames image will be more blurry because all points share information about the whole picture. Due to data sharing points in the center of the photo being removed an information percentage is lost.
It sounds like each film may be different in this respect:
Logically portions of the film are acting as perspective based data OR portions of the film act holographically together to produce the image.
Case 1:
Interference patterns are stored on a one to one basis matching perspective.
At each point or minimum area in the film there must be eat least one element which stores one interference pattern for each perspective or re-creates more than one interference pattern from a single contant structure.
Case 2:
Oddly shaped light defractors exists at many points on a grid.
When light bounces through them they create a picture.
It is the holistic nature of these light effectors that recreate the picture.
They all communicate together. If you remove a square from the center of the film the remaining frames image will be more blurry because all points share information about the whole picture. Due to data sharing points in the center of the photo being removed an information percentage is lost.
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Holotron
What physically changes in glass after writing?
Thank you for acting like and being great scientists!
Your replies have been very helpful.
Your replies have been very helpful.