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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A key property of this interferometric recording is that when it is illuminated by a readout beam, the signal beam is reproduced.

Are you interested in this topic. The information from the page of binary code is carried by the signal beam around to the light-sensitive lithium-niobate crystal.

During reconstructionthe beam will be diffracted by the crystal to allow the recreation of the original page that was stored.

Holographic Versatile Disc | Seminar Report, PPT, PDF for Electrical

Some systems semminar a photopolymer in place of the crystal. One beam, called the object or signal beamwill go straight, bounce off one mirror and travel through a spatial-light modulator SLM. Typically, light from a single laser is split into two paths, the signal path and the reference path.

Each page of data is stored in a different area of the crystal, based on the angle at which the reference beam strikes it. A hologram is a recording of the optical interference pattern seminr forms at the intersection of two coherent optical beams. Holographic Versatile Disc Published on Dec 17, Attached Files for Direct Download.


Seminar Report on Holographic Versatile Disc

When the blue-green argon laser is fired, a beam splitter creates two beams. 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.

The beam that propagates along the signal path carries information, whereas the reference is designed to be simple to produce. Tags for this Thread discengineering forumfaadooengineersholographicreportseminarversatile.

Login to Your Account. If the signal beam was created by reflecting light off a 3D object, then the reconstructed hologram makes the seminaf object appear behind the holographic medium.

It employs a technique known as collinear holography, whereby two lasers, one red and one blue-green, are collimated in a single beam. 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. The two paths are overlapped on the holographic medium and the interference pattern between the two beams is recorded.

This reconstructed page is then projected onto the charge-coupled device CCD camera, which interprets and forwards the digital information to a computer. Current optical storage saves one bit per pulse, and the HVD alliance hopes to improve this efficiency with capabilities of around 60, bits per pulse. 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.


Thread Tools Show Printable Version. Results 1 to 1 of 1. 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. A common reference beam is a plane wave: A second beam, called the reference beamshoots out the side of the beam splitter and takes a separate path to the crystal. Prototype HVD devices have been created with a capacity of 3. While current storage needs are being met, storage technologies must continue to improve in order to keep pace with the rapidly increasing demand.

The complete report is attached!

The time now is 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.

Then mail to us immediately to get the full hvc. The Information Age has led to an explosion of information available to users.