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Holographic projection is the new wave of technology that will change how we view things in the new era. It will have tremendous effects on all fields of life including business, education, science, art and healthcare. To understand how a holographic projector works we need to know what a hologram is. Holography is the method we use to record patterns of light. These patterns are reproduced as a three-dimensional image called a hologram. While Hungarian physicist Dennis Gabor invented the hologram in 1947. Today’s new technology provides some outstanding advantages to not only everyday consumers but also large business corporations and governments. [10] Three-dimensional holographic projection technology is loosely based on an illusionary technique called Peppers Ghost, and was first used in Victorian theatres across London in the 1860s. Pepper's Ghostwas typically used to create ghostlike figures on stage. Hidden from the audience's view, an actor dressed in a ghostly costume would stand facing an angled plate of glass. The audience would be able to see the glass,but not the actor directly.
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3D Holographic Projection Technology
ABIN BABY
ROLL NO: 03
College of Engineering Munnar
2Contents• 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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4Why 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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5Timeline of holography
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6Types 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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8How 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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9Recording 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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10Recording 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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15Reconstruction of hologram
The photographic plate is illuminated with original light source used for recording holograms.
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16Reconstructing a hologram
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17Capturing 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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18Projection 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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19Projection of multicolour
holographic video
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Advances in technology Touchable holograms
Tactile holographic display with haptic feedback
Horizontal 360º view of a image on table top
User interfacing integrated displays
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21Applications & 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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23Projected cost of Holographic system
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24Conclusion 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?
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