Holographical versatile disk

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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Multimedia

Video-On-Demand

Portable Computing

Consumer Audio/Video

ApplicationsApplications

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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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