• Invisibility cloak
    34 replies, posted
I apologies before hand as it's 4am here and I need to get this idea out of my head before I got to bed. Anyways, the idea of invisibility seems to always revolve around bending visible light around an object to make it disappear.Well wouldn't it be easier to make some type of fabric that changes the wavelength of lets say X-Rays to act like visible light? Because X-Rays for the most part can pass right through the human body, the person would at least become partially invisible when they are turned into visible light. Here is an image better describing the idea: [img]http://img850.imageshack.us/img850/3569/dumbm.jpg[/img] Have a good night facepunch.
[QUOTE=dark soul;33669612]I apologies before hand as it's 4am here and I need to get this idea out of my head before I got to bed. Anyways, the idea of invisibility seems to always revolve around bending visible light around an object to make it disappear.Well wouldn't it be easier to make some type of fabric that changes the wavelength of lets say X-Rays to act like visible light? Because X-Rays for the most part can pass right through the human body, the person would at least become partially invisible when they are turned into visible light. Here is an image better describing the idea: [img]http://img850.imageshack.us/img850/3569/dumbm.jpg[/img] Have a good night facepunch.[/QUOTE] several problems with this- visible light and x-rays are two completely different things. another big problem is cancer. if you did manage to make an x-ray to visible light converter it would be gigantic too
Most likely simpler and much less carcinogenic to just bend light.
[QUOTE=krazipanda;33669632]several problems with this- visible light and x-rays are two completely different things. another big problem is cancer. if you did manage to make an x-ray to visible light converter it would be gigantic too[/QUOTE] I actually think that it could be possible. We already have a thin sheet of transparent carbon nanotubes that powerlessly converts infrared to visible light, who knows what that could branch off to. Changing x-rays to the RIGHT visible light would be very difficult though, since X-rays (or any other type of non-visible light) don't correspond to any sort of actual color. The invisibility cloak can't simply shoot light out in all directions, because the perspective of the light would be off and you would see things that only match the location of the wave that you are converting to visible light. The only real solution besides jedi mind tricks is to have light bend [I]around[/I] a material, which is indeed very difficult to do.
[QUOTE=Spycrabz;33669768]Most likely simpler and much less carcinogenic to just bend light.[/QUOTE] Which would make you invisible, but also blind, no?
[QUOTE=BlkDucky;33671803]Which would make you invisible, but also blind, no?[/QUOTE]Make a camera with screen inside.
[QUOTE=AceOfDivine;33673300]Make a camera with screen inside.[/QUOTE] But you'd have to have the camera outside and visible [editline]12th December 2011[/editline] Of course you could use a pinhole camera, but even so
yup, any aperture that could be used for sight would compromise the invisibility of the invisibility cloak, unless that aperture/imaging device operated on a non-visible-light spectrum. In that case, the cloak would not be invisible on said spectrum
[QUOTE=krazipanda;33669632]several problems with this- visible light and x-rays are two completely different things.[/QUOTE] they are? because I was pretty sure they were just different wavelengths of the same thing (electromagnetic radiation)
There was a theory based off the ways Military Stealth bombers are unseen. Basically, a radar-wave is sent to detect unidentified vehicles in an area, and if it hits a solid object, it reflects back at a 180 degree angle back to the base to inform them of the intruder. A Stealth bomber uses reflective metals to change the angle of reflection so that the base never receives a signal back. The problem with this is you'd have to create a light-weight version of this method, which even then would weight at least 75 pounds, and that you'd have to make the sheet not deflect radar-waves, but most if not all of the visible light, which I have not heard of being done. Another method I heard, which seems completely impossible, is that certain light waves deflect others EX: Black light to white light. The only problem with this is that You would have to have a portable light generator that would produce opposite visible light, and considering the places people want to be invisible in, it would mean the generator would have to be able to produce every possible light color.
[QUOTE=huntingrifle;33760372]There was a theory based off the ways Military Stealth bombers are unseen. Basically, a radar-wave is sent to detect unidentified vehicles in an area, and if it hits a solid object, it reflects back at a 180 degree angle back to the base to inform them of the intruder. A Stealth bomber uses reflective metals to change the angle of reflection so that the base never receives a signal back. The problem with this is you'd have to create a light-weight version of this method, which even then would weight at least 75 pounds, and that you'd have to make the sheet not deflect radar-waves, but most if not all of the visible light, which I have not heard of being done. Another method I heard, which seems completely impossible, is that certain light waves deflect others EX: Black light to white light. The only problem with this is that You would have to have a portable light generator that would produce opposite visible light, and considering the places people want to be invisible in, it would mean the generator would have to be able to produce every possible light color.[/QUOTE] Well, the problem with that is, there is no signal behind the stealth plane that needs to be transmitted to the radar dish. With a invisibility cloak, there is a signal that needs to be transmitted.
I think that at some point in the future it could be possible, such as using metamaterials to bend the light and such, but right now it is a bit ahead of scientific capabilities. The applications would be very interesting, though.
Here's both the ideas/theories I stated earlier in poorly drawn form. [IMG]http://i812.photobucket.com/albums/zz43/Etgar/light%20deflection/light_deflection.jpg[/IMG] Black = Inner Cloth Gray = Outer Reflective Cloth Red = Visible Light Light Green = Machine that would generate light opposite of the current visible light hitting the Outer Mesh. Dark Green = Light that would be the opposite of the Visible Light. The Outer Mesh would deflect incoming visible light in a direction that the viewer would not be able to see anything, and also "detect" the incoming wavelengths of the Visible Light, send it to the light "generator", and generate the opposite wavelength, which would in theory remove the visible light. Also, I'm not supporting these theories, I'm just saying what I heard in school and television and whatnot.
[QUOTE=huntingrifle;33761008]Here's both the ideas/theories I sated earlier in poorly drawn form. [IMG]http://i812.photobucket.com/albums/zz43/Etgar/light%20deflection/light_deflection.jpg[/IMG] Black = Inner Cloth Gray = Outer Reflective Cloth Red = Visible Light Light Green = Machine that would generate light opposite of the current visible light hitting the Outer Mesh. Dark Green = Light that would be the opposite of the Visible Light. The Outer Mesh would deflect incoming visible light in a direction that the viewer would not be able to see anything, and also "detect" the incoming wavelengths of the Visible Light, send it to the light "generator", and generate the opposite wavelength, which would in theory remove the visible light. Also, I'm not supporting these theories, I'm just saying what I heard in school and television and whatnot.[/QUOTE] Except now you require sensors on the outside, meaning its not invisible anymore.
That's what was I was thinking, but considering the fact that the opposite wavelength of light would hit the person's eyes before they could see the senors (considering light travels at such a high speed compared to how fast a human can react to light and then perceive it), rendering the senors the only visible part of the cloak. What I really believe is that you're not "invisible", you're just tricking the people looking at you to believe you're invisible, which ,if you want to be technical, means you are invisible.
[QUOTE=huntingrifle;33761100]That's what was I was thinking, but considering the fact that the opposite wavelength of light would hit the person's eyes before they could see the senors (considering light travels at such a high speed compared to how fast a human can react to light and then perceive it), rendering the senors the only visible part of the cloak. What I really believe is that you're not "invisible", you're just tricking the people looking at you to believe you're invisible, which ,if you want to be technical, means you are invisible.[/QUOTE] After re-reading your image and post, I realized you don't really understand how optics work. The sensors are always there, they aren't being hidden by the emitted light. By you not understanding how optics work, I mean the opposite wavelength stuff.
Well, scientists have been able to bend light around a single particle, so the best way to do such thing would probably just doing something like this: [img]http://dl.dropbox.com/u/41041550/light.png[/img] [editline]17th December 2011[/editline] Where the green beam would be when it is on, and the red when it is off
The world's leading scientists have been trying to figure out how to make large objects invisible for quite a while now, I doubt whether any of us is qualified to comment on how it would work. We can happily speculate of course, but there's a degree of modesty we should exert here.
[QUOTE=Mister Royzo;33766040]The world's leading scientists have been trying to figure out how to make large objects invisible for quite a while now, I doubt whether any of us is qualified to comment on how it would work. We can happily speculate of course, but there's a degree of modesty we should exert here.[/QUOTE] Isn't it not too long ago that some 15 year old for a science project discovered something even scientists didn't know about?
i have one and im not sharing it, jerks
[QUOTE=TheCloak;33767025]Isn't it not too long ago that some 15 year old for a science project discovered something even scientists didn't know about?[/QUOTE] A one in a several million (or billion) exception hardly makes everyone qualify as a leading physicist.
[QUOTE=DeEz;33770894]A one in a several million (or billion) exception hardly makes everyone qualify as a leading physicist.[/QUOTE] Exactly. I'm guesing most Facepunchers aren't theoretical physicists, don't wave conjecture around as fact if you have no evidence or qualifications to speak of. If you're commenting on such advanced subjects you should either research profusely or defer to experts, lest the debate degenerate into unsubstantiated gibberish.
[QUOTE=ManningQB18;33671525]I actually think that it could be possible. We already have a thin sheet of transparent carbon nanotubes that powerlessly converts infrared to visible light, who knows what that could branch off to. Changing x-rays to the RIGHT visible light would be very difficult though, since X-rays (or any other type of non-visible light) don't correspond to any sort of actual color. The invisibility cloak can't simply shoot light out in all directions, because the perspective of the light would be off and you would see things that only match the location of the wave that you are converting to visible light. The only real solution besides jedi mind tricks is to have light bend [I]around[/I] a material, which is indeed very difficult to do.[/QUOTE] but you do have different wavelengths of x-rays which could roughly correspond to the equivalent wavelenghts of light. It would be much eaiser to convert the light to weak microwaves or short wave radio waves and bounce it off an aritificial ionosphere made around you by the cloak [editline]24th December 2011[/editline] also, you could have some sort of material which changes its refractive index which can change it so that the angle the list is hitting it at becomes its critical angle and the light goes along its surface
[QUOTE=dije;33765352]Well, scientists have been able to bend light around a single particle, so the best way to do such thing would probably just doing something like this: [img]http://dl.dropbox.com/u/41041550/light.png[/img] [editline]17th December 2011[/editline] Where the green beam would be when it is on, and the red when it is off[/QUOTE] Wouldn't that make you blind while wearing the cloak then?
Couldent a form of advanced wireless, nano devices (Cameras, machines, ect), advanced materials, photo recepter create a sheet over a suit that communicates with the sheet to advert blindness do the trick? I mean the computer can compute the errors and fix them, the photoreceptors and nano cameras can receive and give off light, infact can use it as a source of energy also. The advanced (As in no lag, no errors) wireless can transmit to a corisponding nano device that can change its corisponding device as the computer sees errors. The nano devices are weaved together on a material the best suits this application. It then goes over a suit (Becomes part of the suit) and the computer can project light from where the wearers eyes would be. If we could do this, why not link it with the mind to help prevent error so it can change the light before the wearer moves making a seemless movement for the wearer.
[QUOTE=TheCloak;33767025]Isn't it not too long ago that some 15 year old for a science project discovered something even scientists didn't know about?[/QUOTE] If you're referring to the kid that made a science project that arranged solar panels like leaves then actually that was riddled with bad science and was the media not bothering to actually check what they were reporting.
[QUOTE=metallics;33883596]If you're referring to the kid that made a science project that arranged solar panels like leaves then actually that was riddled with bad science and was the media not bothering to actually check what they were reporting.[/QUOTE] Could you please form that into a proper sentence so that we may better understand what it is that your are saying?
Some country was working on something like this but I can't remember who it was.
[QUOTE=huntingrifle;33760372]There was a theory based off the ways Military Stealth bombers are unseen. Basically, a radar-wave is sent to detect unidentified vehicles in an area, and if it hits a solid object, it reflects back at a 180 degree angle back to the base to inform them of the intruder. A Stealth bomber uses reflective metals to change the angle of reflection so that the base never receives a signal back.[/QUOTE] meanwhile in the visible spectrum we see objects due to ambient light being reflected from them; we don't see by having little spotlights inside our eyeballs. [editline]29th December 2011[/editline] [QUOTE=SomeRandomGuy16;33881550]Wouldn't that make you blind while wearing the cloak then?[/QUOTE] cut little holes for your eyes in it.
If I had an invisibility cloak i'd hide in the girls locker room lol. -Perogies.
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