3D Holographic Projection Technology

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Contents• What is Holography• Why Holography• Types of Holograms• How Holograms work• Recording of hologram• Reconstruction of hologram• Advances in technology• Applications & Future scope• Conclusion

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What is holography

Holography is a technique that allows the light scattered from an object to be recorded and later reconstructed.

The technique to optically store, retrieve, and process information.

Preserve the 3-D information of a holographed subject

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Why holographic display

A high resolution three dimensional recording of an object

Glasses free 3D display No need for projection screen Life like images Interactive display

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Timeline of holography

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Types of Holograms

A.Reflex hologramIlluminated by a spot of

white incandescent light source, from front-above

The image consists of light reflected by the hologram

Produces multicolour holograms, makes images optically indistinguishable from the original objects

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B.Transmission hologram Viewed with laser light,

usually of the same type used to make the recording

Need light source behind them

Virtual image can be very sharp and deep

C.Computer-generated holograms

No need for a real object Interference pattern is

calculated digitally, using algorithms

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How holograms work

The time-varying light field of a scene with all its physical properties is to be recorded and then regenerated. Hence the working of holography is divided into two phases:•Recording•Reconstruction

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Recording of hologram

Basic tools required to make a hologram includes a red lasers, lenses, beam splitter, mirrors and holographic film

Holograms are recorded in darker environment

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Recording a hologram

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• Laser : Red lasers, usually helium-neon (HeNe) lasers,

are common in holography. These are coherent light

source.

• Beam splitter: This is a device that uses mirrors and

prisms to split laser beam of light into two beams.

Object beam (directed onto the object) and

Reference beam (travels directly onto the recording

medium)

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• Mirrors: These direct the beams of light to the

correct locations

• Holographic film: Holographic film can record light

at a very high resolution, which is necessary for

creating a hologram. It's a layer of light-sensitive

compounds on a transparent surface, like

photographic film.

Eg: Silver Halide Emulsion

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Process

When the two laser beams reach the recording medium, their light waves intersect and interfere with each other. It is this interference pattern that is imprinted on the recording medium.

HologramRecording

HologramRecondtruction

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Reconstruction of hologram

The photographic plate is illuminated with original light source used for recording holograms.

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Reconstructing a hologram

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Capturing of holographic video

By replacing the conventional holographic plate with a digital camera and an optoelectronic 2D screen, we can capture and display holographic video.

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Projection of holographic video

Video hologram is coded into light modulators

These light modulators are illuminated by coherent light beam source, to project video

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Projection of multicolour holographic video

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Advances in technology

Touchable hologramsTactile holographic

display with haptic feedback

Horizontal 360º view of a image on table top

User interfacing integrated displays

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Applications & Future scope

Educational applications Marketing with 3D holographic

display 3D simulation displays for

scientific visualization Improved virtual Reality and

augmented reality Telepresence and video

conferencing Entertainment displays Military and Space

Applications

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Holographic checkpoint for military, battlefield simulations

Intense real gaming rooms

In future all displays like televisions, mobile phone displays, projector displays will be replaced by holographic displays

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Projected cost of Holographic system

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Conclusion Holographic Technology

and Spectral Imagining has endless applications, as far as the human mind can imagine

In future, holographic displays will be replacing all present displays in all sizes, from small phone screen to large projectors

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• “Holographic Projection Technology: The World is Changing.”; Ahmed Elmorshidy, Ph.DJOURNAL OF TELECOMMUNICATIONS, VOLUME 2, ISSUE 2, MAY 2010

• “Capture, processing, and display of real-world 3D objects using digital holography”; Thomas J. Naughton; 2010 IEEE Invited Paper

• “Touchable Holography”; Takayuki Hoshi; The University of Tokyo; 2009

• “Holographic 3-D Displays - Electro-holography within the Grasp of Commercialization”; Stephan Reichelt, Ralf Haussler, Norbert Leister, Gerald Futterer, Hagen Stolle and Armin Schwerdtner (2010)

• “How Holograms Work.”; Wilson, Tracy V. 2010.“ HowStuffWorks, Inc.Downloaded November 05, 2010.<http://science.howstuffworks.com/hologram.html>

References

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Thank you

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Questions?