OPTICAL CAMOUFLAGE TECHNOLOGY
What
is an Optical Camouflage?
Optical
Camouflage is a technology which allows an object to blend into the surrounding
using optical technologies and has potential to achieve perfect concealment
from visual detection. It is a kind of active camouflage which completely
envelopes the wearer. It displays an image of the scene on the side opposite to
the viewer on it, so that the viewer can “see through” the wearer, rendering
the wearer invisible.
Light
Surface Reflectivity:
·
In
beaded surface the reflected light rays travel back along the same path as the
incident rays which is known as retro
How
does it work?
A digital video camera
captures the scene behind the person wearing the cloak. The computer processes
the captured image and makes the calculations necessary to adjust the still
image or video so it will look realistic when it is projected. The projector
receives the enhanced image from the computer and shines the image through a
pinhole-sized opening onto the combiner. The silvered half of the mirror, which
is completely reflective, bounces the projected image towards the person
wearing the cloak. The cloak acts like a movie screen, reflecting light
directly back to the source, which in this case is mirror. Light rays bouncing
off of the cloak pass through the transparent part of the mirror and fall on
the user’s eyes. Remember that the light rays bouncing off of the cloak contain
the image of the scene that exists behind the person wearing the cloak. The
person wearing the cloak appears invisible because the background screen is
being displayed onto the retro-reflective material. At the same time, light
rays from the rest of the world are allowed to reach the user’s eye, making it
seem as if an invisible person exists in an otherwise normal looking world.
Application:
- Used in Stealth technology, to make airplane invisible to Radar.
- Doctor performing surgery could use optical camouflage technique to see through their hands and instruments to the underlying tissue.
- Predator, Iron man, James Bond[die another day] Movies and Video games.
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