OPTICAL CAMOUFLAGE - Invisibility Cloak

1Optical Camouflage-Invisibility Cloak

Ayush JainEC-11507162

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OPTICAL CAMOUFLAGE is a technology which makes the wearer invisible with respect to surrounding. Camouflage means to disguise or to blend with the surroundings.

It is the method which allows an organism or object to remain indistinguishable from the surrounding environment. by use of panels or coatings capable of altering their appearance, colour, luminance and reflective properties.

Optical Camouflage-Invisibility Cloak

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Creating complete optical camouflage would require a number of tiny cameras and projectors

These are programmed to gather visual data from different angles and project the gathered images outwards in large number of different directions to give the illusion of invisibility from all angles.

A massive amount of computing power and embedded sensors would be necessary to continuously project the correct images in all directions.

For this we would certainly require sophisticated nanotechnology, as our computers, projectors, and cameras are not yet miniaturized enough to meet these conditions.


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The invisibility cloak renders the human

partially invisible, when he/she slips

beneath the shining, silvery cloak.


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Optical camouflage requires a complicated arrangement. First, the person who wants to be invisible (Person A) wears the cloak. An observer (Person B) stands before (Person A) at a specific location. At that location, (Person A) appear to be partially invisible to (Person B). If (Person B) were viewing from a slightly different location, he would simply see (Person A) wearing a cloak.


The cloak that enables optical camouflage to work is made from a special material known as

retro-reflective material.


The Invisibility Cloak

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PrinciplePrinciple :

Optical camouflage doesn't work by way of magic. It works by taking advantage of something called augmented-reality technology.

Augmented reality: It merely tries to supplement real world with additional, helpful content.


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RequirementsRequirements ::

A garment made from highly reflective material

A video camera

A computer

A projector

A special, half-silvered mirror called a combiner


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The Complete System :


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Video Camera :

Capturing the background image requires a video camera, which sits behind the person wearing the cloak. The video from the camera must be in a digital format so it can be sent to a computer for processing.


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Computer :

All augmented-reality systems rely on powerful computers to synthesize graphics and then superimpose them on a real-world image.

For optical camouflage, the Computer must take the image from the video camera, calculate the appropriate perspective to simulate reality to be projected onto the retro-reflective material.


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Projector :

For optical camouflage, the central opening must be the size of a pinhole. This ensures a larger depth of field so that the cloak can be located any distance from the projector.


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Combiner :

A special mirror to reflect the projected image toward the cloak

To let light rays bouncing off the cloak return to the user's eye.

This special mirror is called a beam splitter, or a combiner.


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Real World ApplicationsAUGMENTED STEREOSCOPIC VISION IN SURGERY

Doctors performing surgery could use optical camouflage to see through their hands and instruments to the underlying tissue so making the complicated surgeries a bit better.

COCKPIT FLOORSPilots landing a plane could use this technology to make

cockpit floors transparent with micro reflectors. This would enable them to see the runway and the landing gear simply by glancing down. TRANSPARENT REAR HATCH

Drivers backing up cars could have a quick glance backward through a transparent rear hatch would make it easy to know when to stop.STEALTH TECHNOLOGY

Stealth means ‘low observable’. Its basic idea is to ‘blend’ in with the background and is used mainly for military purpose. Stealth Technology is used in the construction of mobile military systems such as aircrafts and ships to significantly reduce their detection by enemy, primarily by an enemy RADAR.


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Disadvantages :

The target can only be in a certain field of view


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Partial Invisibility

Requires Expensive Equipments.

Although this is having some disadvantages.

Optical Camouflage is a nice technology. However further developments are being going on, I believe this is going to change the entire world.

Conclusion :


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Thank you


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OPTICAL CAMOUFLAGE - Invisibility Cloak