04-01-2011, 04:35 PM
holographic technology.ppt (Size: 383.5 KB / Downloads: 240)
Submitted by
VIKAS TRIPATHI
B.Tech 4TH Year
UNITED INSTITUTE OF TECHNOLOGY,ALLAHABAD
What is Holographic Technology
Holographic Storage is an optical technology that allows 1 million bits of data to be written and read out in single flashes of light. Thousands of Holograms can be stored in the same location throughout the entire depth of the medium.
Holography breaks through the density limits of conventional storage by going beyond recording only on the surface, to recording through the full depth of the medium. Unlike other technologies that record one data bit at a time, holography allows a million bits of data to be written and read in parallel with a single flash of light. This enables transfer rates significantly higher than current optical storage devices.
Benefits of Holographic Technology
Dynamic Range
Photosensitivity
Dimensional Stability
Optical Flatness
Low Scatter
Non-volatile readout
Long shelf-life of media
Long archival life of stored data
Environmental/thermal stability
APPLICATIONS
1. Holographic Data Storage
Holographic memory is a new optical storage method that can store 1 terabyte (= 1000 GB) of data in a crystal approximately the size of a sugar cube.
Advantages of HDS over conventional storage methods
Data is stored in all three dimensions of the material and not just the surface.
Read/write speeds are also much higher since data is written and read out as 2D digital or analogue images in a 3D volume rather then a bit stream.
The bit rate error is also decreased considerably because error causing factors such as scratches, dust, etc tend to affect the surface only and since a hologram is recorded as a complex interference pattern in the bulk of the material, these affects are limited.
2. HOLOGRAPHIC IMAGES
Holographic images interfaces empower operators to enter commands and data into a wide range of electronic equipment by simply passing a finger through holographic images of what would otherwise be the keys of a keypad or keyboard, appearing to float in the air at a convenient location in front of the equipment. An infrared sensor scans the plane of those images to detect the intrusion of a finger into the desired portion of those images, identifies which number or symbol has been selected and transmits that selection to the equipment's internal software, much the same way pressing a button on any ordinary keypad would.
Adavantages
Holographic images solve many problems posed by conventional, tactile keypads and keyboards, particularly those regularly subject to contaminants, customer abuse, dirt, moisture, temperature fluctuations and shock.
3. Anti Counterfeit System
Anti-counterfeit security is an attempt to prevent valuable products or
documents from being copied or falsified.
Holography offers certain advantages as a security device.
Producing an original hologram is expensive and time consuming, but mass-produced replicas from the original are relatively inexpensive.
The equipment and skills necessary for mass producing holograms has been fairly difficult to obtain in the past.
Holograms look distinctively different from printed labels.
The tools counterfeiters have traditionally used for counterfeiting (the camera and the printing press) do not work on holograms.