Blue Ray
1: A little science first
2: Blue?
3: The history of CD
4: The consortium
5: Why Blu-ray?
6: Store!
7: Get RID of it
8: The recording technology
9: Groovy!
10: Land Ho!
11: Those who not like it
12: MPEG
13: Basic Blu-ray Disc Characteristics
14: Main Specifications
15: Conclusion
1:A little science first
As we all know, CD players and recorders read and write the CD’s with the aid of a laser. Laser is short for: Light Amplification by Stimulated Emission of Radiation.
In a nutshell this means that high emitted energy gives radiation in the form of light, sort of like a lightbulb does. However laser light is very different than your average lightbulb. Laser comes in a straight direct beam and in only one wavelength (only red, only green, only blue etc). This wavelength is measured in nanometers and science uses the Greek letter Lamda () for this.
Because a laser is a very tiny and direct beam it is perfect to reflect the data written on a cd, because the data is long (over 3 miles!) but it is very small (about 5 microns).
The laser sends a beam towards the cd data and the beam gets reflected or not, thus resulting in high or low digital signal. To put it simple: If the reflected beam gets picked up by the receptor, it’s a 1 ,if not.. it’s a 0.
If you write data on a cd, the real laser power kicks in. It actually heats up a certain part of the cdrom surface, thus creating a physical 0 or 1 on the cdrom, which can later be read by your cd player.
The smaller the wavelength of a laser is, the smaller the beam can be. If the beam is smaller .. it can also read/write the same data using a smaller width (less than 1 micron!). So, on the same amount of surface, a laser with a smaller wavelength can read/write far more data on that surface than a laser with a bigger wavelength! And that’s what Blu-Ray is! A laser with a smaller wavelength. Blue.
2:Blue?
Blu-Ray uses a blue laser. Because it uses a blue laser it can store enormous more amounts of data on it than was ever possible using red laser on the same amount of surface (being a 120 mm disc).
To have an even greater precision and make sure every part of the laserlight actually gets hit on the part that is needed for writing/reading the disc, a special lens is used in every cd player.
Briton Kane Kramer invented the digital audio player in 1979, known as the MP3 player. Finally, the compact discs (CD) came out in 1982 and “The first album ever released on a CD was Billy Joel’s 52nd Street. The first to sell one million copies was Dire Straits’ Brothers In Arms.” Following the CD were: DAB radio, Sony Discman, Sony Minidisc.... ...
The way it works, the heat (thermal) energy from the laser melts fat whereas typical liposuction removes it. This procedure actually prompts the production of new collagen, which is the primary protein giving skin its tone and texture and ability to stretch.
On the other hand, Sittig et al (2008) have discussed the grand challenges of CDS and placed them into following three large categories:
Laser is an acronym used for Light Amplification by Stimulated Emission of Radiation. Laser treatment is a procedure used to cure skin problems with a strong beam of light. Experienced cosmetologists and dermatologists use this new technology to cure many ailments.
Laser tissue interaction mainly contributes to absorption. The dental laser wavelength lies in the near, mid and far infrared region. The basic properties such as selective absorption, coagulation, sterilization and stimulatory effects are the most important parameters for selecting lasers for dentistry. The following lasers and their corresponding wavelength are commonly used for soft tissue interactions. In short dental lasers are relatively easy to use if the dentists have been trained properly. The lasers function with an end cutting action while other dental instruments are side cutting.
How a record player works is quite simple. A motor is somehow connected to a solid disc so that the disc is rotated at a constant speed. On top of the rotating disc (platter), The record is placed on top, with a slip mat in between. The slip mat can serve two functions. In the past to hold the record in place so that it would not rotate independently of the platter. Now, however, the slip mat serves a much different function. Instead of holding the record in place, the slip mat is now used to reduce the friction between the spinning platter and the record. This way a DJ can scratch (manually move the record, usually at high speeds) the record while the platter continues to spin underneath. Once the record is rotating, a stylus glides along the grooves and picks up the vibrations, these are then converted into audible sound.
3) Stokes shift - Generally the emitted fluorescent light has a longer wavelength and lower energy than the absorbed light. This phenomenon is known as Stokes shift. It is due to the loss of energy between the time a photon is absorbed and when it is emitted.
Have u ever thought about African Americans invalid with television? If not in this report you will learn about how African Americans have influenced television. You will learn about television shows that have effected television and also just certain people that have effected television also. Commercial television was born in 1948 as each of the three major networks, ABC, CBS, and NBC, began broadcasting. 1948 was also a great year in African American history with the desegregation of the United States armed forces to see Blacks in the American Military and an endorsement of civil rights in the presidential platform of the Democratic Party headed by President Harry S. Truman.
... A Laser Scanner does not have to be in contact with a scanner tag to use it. A standard reach Laser Barcode Scanner can read an institutionalized ID from something like 6 to 24 inches away, and a long go Scanner can read one from something like 2 to 8 feet away. Certain extra long-enlarge Laser Barcode Scanners are prepared for examining a scanner tag from up to 30 feet away. Laser Barcode Scanner are regularly in handheld or "firearm" structure components, yet are additionally normally assembled for ledge or settled mount provisions.
Introduction Reed Hastings (co-founder) founded Netflix in 1997. During this time, Netflix offered DVD rentals by mail. As Netflix went public in 2002, shortly a year later their subscription reached the one million mark (Netflix Management, 2011). Recently, Netflix was recognized as one of the 50 most innovative companies, ranking number eight for “streaming itself into a $9 billion powerhouse (and crushing Blockbuster)” with 20 million subscribers (fastcompany.com, 2011). This success shows how Netflix embraced a business approach where their mission was to take the troublesome experience of everyday consumers and transform them into a business opportunity.
As you can see lasers are a very useful and important tool which is why I have
Modulate the laser using the transformer. Turn on amplifier circuit. Point laser towards the photo resistor. Connect to the oscilloscope. Adjust the amplifier until you can hear the signal generator signal.
one will begin to see more and more documents being on CD-ROM and also on the