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A SEMINAR PRESENTATION
ON
HOLOGRAPHIC VERSATILE DISC
GUIDED BY: TEJAS RANAPREPARED BY: CHIRAG L. LATHIYA
3RD YEAR B.E.ROLL NO. 17
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What is machine vision?
Machine vision is human eyes and measure and convert into signal intake gols image processing
Machine vision technology is an important branch of computer science.
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Collinear Holography
In collinear holography there are two type of laser beam.
Red beam(Information beam) Green beam(Refrence beam)
This two beams are collimated in a single beam.
The green laser reads data encoded as laser interference fringes from holographic layer near the top of the disc.
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while the red laser is used as the reference beam and to read servo information from a regular CD-style aluminum layer near the bottom.
A dichroic mirror layer between the
holographic data and the servo data reflects the green laser while letting the red laser pass through.
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Basic structure
It has similar to CD-DVD structure. It is differs to use laser beams & its pulse speed.
The Components are like … blue or green laser(532 nmwl),
red laser ,beam splitter, mirrors special lights modulator(SLM), C-MOS sensor ,photo polymer recording medium.
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How it works?
Current optical storage saves one bit per pulse & the HVD hopes to improve this efficiency with capability of around 60,000 bits/pulse.
Truncated cone shape that has 200 micrometer diameter at the bottom &
500 micrometer diameter at top.
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Data-SLM-Binary
Data is created to fire laser beam into the beam splitter to produce 2 beam.
1.Reference beam ( Directed to away from the SLM). 2.Information beam ( Direct toward – the SLM ).
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The 0’s & 1’s data pages are translated into the pixel of the special light modulator that either block or tr-
ansmit light.
A memory system isn't very useful if you can't access the data you've stored.
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Capacity, Speed, Cost Comparison
CapacityWriting/Reading Speed
DiscsApprox.Cost
RecordablePlayerApprox.Cost
HolographicVersatile Discs(HDSS)
HVD300 GB–1.6 TB
1 GB/s $120 $3000
Blu-rayDiscs
BD25 GB–50 GB
36.5
Mb/s$18 $2000
Digital Versatile Discs
DVD–HD-DVD
5 GB–30 GB
36.5
Mb/s$10 $2000
Compact Discs
CD783 MB–1.3 GB
36.5
Mb/s$4 $200
Advantages
HVD have the capacity to hold up to 3.9 terabytes (TB) of information, which is approximately 5,500 times the capacity of a CD-ROM,830 times the capacity of a DVD,160 times the capacity of single-layer Blu-ray Discs, and about 4 times the capacity of the largest computer hard drives as of 2007.
Transfer Rate is also higher than DVD.
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Disadvantages
Holography memory has been around for more than 40 years but several characteristic made it
difficult to implement , now progras of HVD make it easy to implement.
It is not available in market.
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