Also Explore the Seminar Topics Paper on Holographic Versatile Disc Holographic Versatile Disc (HVD) is an optical disc technology still in. Download Seminar Report on Holographic Versatile uses a technique where green and red laser of length nm and nm. HVD is an optical disc technology developed between April and mid that can store up to several terabytes of data on an optical disc.
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Holographic Versatile Disc | Seminar Report, PPT, PDF for Electrical
A key property of this interferometric recording is that when it is illuminated by a readout beam, the signal beam is reproduced. The information from the page of binary code is carried by the signal beam around to the light-sensitive lithium-niobate crystal. One beam, called the object or signal beamwill go straight, bounce off one mirror and travel through a spatial-light modulator SLM.
Some systems use a photopolymer in place of the crystal.
A second beam, called the reference beamshoots out the side of the beam splitter and takes a separate path to the crystal. A common reference beam is a plane wave: The Information Age has led to an explosion of information available to users.
Holographic data storage is a volumetric approach whichalthough conceived decades ago, has made recent progress toward practicality with the appearance of lower- cost enabling technologiessignificant results from longstanding research efforts, and progress in holographic recording materials.
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The beam that semihar along the signal path carries information, whereas the reference is designed to be simple to produce. The complete report is attached! Prototype HVD devices have been created with a capacity of 3. The time now is Tags for this Thread discengineering forumfaadooengineersholographicreportseminarversatile.
When the hologram is recorded in a thin material, the readout beam can differ from the reference beam used for recording and the scene will still appear. When the blue-green argon laser is fired, a beam splitter creates two beams. A hologram is a recording of the optical interference pattern that forms at the intersection of two coherent optical beams.
In order to retrieve and reconstruct the holographic page of data stored in the crystal, the reference beam is shined into the crystal at exactly the same angle at which it entered to store that page of data. When the two beams meet, the interference pattern that is created stores the data carried by the signal beam in a specific area in the crystal — the data is stored as a hologram.
If the signal beam was created by hhvd light off a 3D object, then the reconstructed hologram makes the 3D object appear behind the holographic medium. Attached Files for Direct Download. Each page of data is stored in a different area of the crystal, based on the angle at which the reference beam strikes it.
However, conventional data storage technologies ,where individual bits are stored as distinct magnetic or optical changes on the surface of a recording medium, are approaching physical limits. Typically, light from a single laser is split into two paths, the signal path and the reference path. hvdd
Seminar Report on Holographic Versatile Disc
Thread Tools Show Printable Version. Login to Your Account. Current optical storage saves one bit per esminar, and the HVD alliance hopes to improve this efficiency with capabilities of around 60, bits per pulse. Holographic Versatile Disc Published on Dec 17, This reconstructed page is then projected onto the charge-coupled device CCD camera, which interprets and forwards the digital information to a computer.
Are you interested in this topic. The two paths are overlapped on the holographic medium and the interference pattern between the two beams is recorded. It employs a technique known as collinear holography, whereby two lasers, one red and one blue-green, are collimated in a single beam. While current storage needs are being met, storage technologies must continue to improve in order to keep pace with the rapidly increasing demand.
During reconstructionthe beam will be diffracted by the crystal to allow the recreation of the original page that was stored. Results 1 to 1 of 1.