How Invisibility Cloaks Work

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How Invisibility Cloaks Work

Post by Tech-me on Fri Jun 12, 2009 9:34 pm

How Invisibility Cloaks Work
If you're a fan of Harry Potter,
then you're quite familiar with the concept of an invisibility cloak.
In his first year at Hogwarts Academy, Harry receives an invisibility
cloak that used to belong to his father. As its name suggests, the
invisi­bility cloak renders Harry invisible when he slips beneath the
shining, silvery cloth.



This seems perfectly believable when you're reading about a
fictional world filled with witches, wizards and centuries-old magic;
but in the real world, such a garment would be impossible, right? Not
so fast. With optical-camouflage technology developed by scientists at
the University of Tokyo, the invisibility cloak is already a reality.


Optical camouflage delivers a similar experience to Harry
Potter's invisibility cloak, but using it requires a slightly more
complicated arrangement. First, the person who wants to be invisible
(let's call her Person A) dons a garment that resembles a hooded
raincoat. The garment is made of a special material that we'll examine
more closely in a moment. Next, an observer (Person B) stands before
Person A at a specific location. At that location, instead of seeing
Person A wearing a hooded raincoat, Person B sees right through the
cloak, making Person A appear to be invisible. The photograph on the
right below shows you what Person B would see. If Person B were viewing
from a slightly different location, he would simply see Person A
wearing a silver garment (left photograph below).




Still, despite its limitations, this is a cool piece of technology. Not
only that, but it's also a technology that's been around for a while.
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Re: How Invisibility Cloaks Work

Post by Dark Soul on Sat Jun 13, 2009 1:34 am

Wow!
I couldn't believe it!
Its too awesome!
Can you see that the opacity is really decreased???!!!!!

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Re: How Invisibility Cloaks Work

Post by neurosonic on Sat Jun 13, 2009 1:52 am

woooww...this is damn coooooooool...thx 4 sharing !

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