Cloak of Invisibility Coming Soon? 505
Chris writes "The idea of an "invisibility cloak" has made the leap from science fiction books to an international patent application. The "three dimensional cloaking process and apparatus" for concealing objects and people (WO 02/067196) employs photodetectors on the rear surface which are used to record the intensity and color of a source of illumination behind the object. Light emitters on the front surface then generate light beams that exactly mimic the same measured intensity, color and trajectory. The result is that an observer looking at the front of the object appears to see straight through it."
Practicality? (Score:5, Insightful)
I don't think it is that workable for all directions, or even more then a few.
Looking behind it (Score:4, Insightful)
In addition, I have serious questions about the resolution of the device (how many sensors and how many light emitters). Will the person look "pixelated" and or will there be some other problem.
Lastly, such a device is not useful in combat situations as many soldiers in such a ground war situation will be outfitted with infr-red detectors, which will probably be able to detect the human behind the suit.
Good idea but has a lot of practical problems (we haven't even discussed the power source).
Re:Scarcy concept (Score:3, Insightful)
Re:Second item in article is interesting (Score:4, Insightful)
I suggest buying a wood rasp or a sandpaper block :-)
Tim
Re:Second item in article is interesting (Score:4, Insightful)
I can see it ... no pun intended. (Score:2, Insightful)
Re:Practicality? (Score:2, Insightful)
Re:Practicality? (Score:5, Insightful)
Well, that depends on what you mean by workable.
Just getting the hue and intensity right (and being able to vary those) will go a very long way. It's not for nothing that English fishermen weren't allowed to paint their hulls white in days of yore, or that Mountbatten had his fleet painted pink. (The sky is brigther than the ocean at dusk/night and hence a light hull blends in. And pink works better agains the redder skies of asian waters).
The US Army even conducted trials with lamps on tanks to make them harder to spot as silouettes against the sky on a ridge line for example.
Now, the light trick is unworkable for other reasons (you have to be quick on the switch) should you drive in front of a dark object. So if this process could be automated there's much to be gained.
Now, of course if your main objection that this is far from a cloak of invisibility, that's for certain. But it could be quite useful camouflage.
And kids remember the old adage "A running soldier in a camoflague uniform, looks just like a running soldier in a camoflague uniform." Camouflage is still very much a stationary art. I doubt that tricks like these would change that much.
Re:Scarcy concept (Score:5, Insightful)
A sniper wouldn't want this high tech and very probably delicate junk... they will very happily continue to be quite invisible by using skills honed by learning tricks using organic and old - doesn't require batteries camoflauge..
Re:moving "eyes" can pick it up? (Score:4, Insightful)
i.e. when you move from side to side (or up/down) the object will shift at a slightly different rate than the background, and your senses will detect something. you may not be able to tell what it is, but something will feel "off". I'm sure at greater distances the effect will be less, and therefore the technique will be more useful.
Reminds me of Predator, and the way that it shimmered when it moved. My guess is that they used the same thought when they made that movie.
Very cool.
Better applications (Score:5, Insightful)
The article very definately uses the words "detect" (light behind) and "generate" (image in front). This implies it is not some passthrough technology (fiber, etc), but an electronic record and recreation.
If this "clock" could live up to its claims, there are three (possibly more) far more interesting applications that must be considered:
Given that researchers would be coining it from more down-to-earth inventions like these, I can't really see that the technology - as described - exists or is being developed.
Good camoflage though ... (Score:3, Insightful)
The most important part of camoflage is making recognizable features hard to see -- hands, faces, etc -- things our visual system is hardwired to pickup out of the background. This invisibility cloak would do that.
I imagine it looking like the Alien in that Arnold movie, hard to see unless it's moving and then the distortions give it away.
Of course is this a really old idea -- heck it a similiar idea was in comics in the 1970s (some super heros club house had this kind of device to hide it from view).
Re:Practicality? (Score:1, Insightful)
It's like trawling through science fiction, picking out all of the interesting (but currently unworkable) design ideas, making crude mock-ups of how they might work, and patening them.
Re:Prior Art? (Score:2, Insightful)
IIRC nobody could patent geostationary satellites when they were first built because a certain well known sci-fi author had described the concepts previously.
Or I could be talking crap, that happens too.
Perfect bad patent (Score:5, Insightful)
1) the idea is pretty obvious (as well as many references in common SF literature)
2) the actual implementation with current tech will be pretty miserable. Put big bright light behind object, make object shine big bright light at viewer. Viewer is blinded by both and as object is indistinquishable the technique is easily demonstrated to the patent requirement level.
3) it serves as a patent stake. Further research into a better/improved technology will have to deal with this patent.
This is a near perfect bad patent that grants the patent holder a big stake in the ground for actually showing very little. And any future work that will actually improve the technique is going to have to deal with the patent.
Still More Limitations (Score:5, Insightful)
Re:You're not an engineer, are you? (Score:3, Insightful)
The idea in the patent is old. So we only care about the implemtnation, and the implementation looks full of problems.
When it's better and practical- then we should care.
Re:Practicality? (Score:2, Insightful)
Nope (Score:2, Insightful)
Re:The biggest question of course... (Score:2, Insightful)
Re:It's only a patent??? (Score:3, Insightful)
Haven't you been reading any other articles lately? Only a patent? You mean like Amazon's "one click" patent? Like BT's patent of hyperlinks? Compuserve GIFS? A laser pointer as an exercise device for a cat? The patent on a swing?
No, it's not a new idea. The military has been playing with it for years. Deep sea fish do it naturally with bioluminesence. If they get a working model, then ok, give them a patent. But I'd hate to see another ridiculous patent granted on an idea that's been around for decades.
Re:Practicality? (Score:4, Insightful)
You just can't let them get too close or you're screwed.
Re:Text of Patent Application (Claims) (Score:3, Insightful)
I *very* much doubt that any practical use of optical camoflauge will be developed during the life of these patents.
Option one is basically a box of TV screens enclosing your object (which would mean that looking at it at anything other than dead-on would be a giveaway).
Option two is the Panther Modern suit, where you have a bunch of tiny emitters and receptors across the surface of the garment or vehicle. I really can't see this working without nanotechnology, since you'd need some way for each element to know its position and orientation in relation to its counterpart on the other side. You'd also need to hook it up to a computer of some kind for either a one-time calibration for a given wearer, or (ideally) a portable equivalent that would be constantly re-calibrating it to take into account things like changing body positions (for a person) or the turret rotating on a tank.
Option three is the Star Trek cloaking device, where (presumably) EM waves are bent so that they flow uninterrupted around the person or vehicle, while still leaving the eyes or sensors exposed so that the same effect doesn't render the cloakee blind. Obviously this is still in the "magic" realm at this point.
So IMO option one is useless, option two is currently impractical, and option three is currently impossible. I don't see any of this changing before these patents' 20 years are up.
Re:Text of Patent Application (Claims) (Score:3, Insightful)
Option two is the Panther Modern suit...
Option three is the Star Trek cloaking device...
Nicely stated. Funny (and sad) how your brief descriptions are dramatically more detailed than this farcical patent application while also making it painfully obvious that these concepts are neither novel nor obvious. I sincerely hope that usenet and blogs will be used by examiners when searching for prior art. At the very least, even when such bad patents are approved, I hope that potential investors and partners are smart enough to search the web to see how well these might hold up in court and decide to invest elsewhere.