wtat is acathode ray tube?

Question

defination,constrcation,working,use

Answer 1

Vacuum tube that produces images when its phosphorescent surface is struck by electron beams.

CRTs can be monochrome (using one electron gun) or colour (typically using three electron guns to produce red, green, and blue images that, when combined, render a multicolour image). They come in a variety of display modes, including CGA (Color Graphics Adapter), VGA (Video Graphics Array), XGA (Extended Graphics Array), and the high-definition SVGA (Super Video Graphics Array).

The cathode ray tube (CRT), invented by German physicist Karl Ferdinand Braun in 1897, is the display device that was long used in most computer displays, video monitors, televisions, radar displays and oscilloscopes. The CRT developed from Philo Farnsworth's work was used in all television sets until the late 20th century and the advent of plasma screens, LCD TVs, DLP, OLED displays, and other technologies. As a result of CRT technology, television continues to be referred to as "the tube" well into the 21st century, even when referring to non-CRT sets.

For more explaination click on following link:
http://en.wikipedia.org/wiki/cathode_ray...
For figure:
http://www.bartleby.com/images/a4images/...

Graphical displays for early computers used vector monitors, a type of CRT similar to the oscilloscope but typically using magnetic, rather than electrostatic, deflection. Here, the beam traces straight lines between arbitrary points, repeatedly refreshing the display as quickly as possible.

Answer 2

Cathode rays are streams of electrons observed in vacuum tubes, i.e. evacuated glass tubes that are equipped with at least two electrodes, a cathode (negative electrode) and an anode (positive electrode) in a configuration known as a diode.

When the cathode is heated, it emits some radiation which travels to the anode. If the inner glass walls behind the anode are coated with a phosphorescent material, they glow. A metal shape placed between the electrodes casts a shadow on the glowing coating. This suggested that the cause of the light emission was comprised of rays emitted by the cathode and hitting the coating. They travel towards the anode in straight lines, and continue past it for some distance.

Answer 3

a vacuum tube generating a focused beam of electrons that can be deflected by electric fields, magnetic fields, or both. The terminus of the beam is visible as a spot or line of luminescence caused by its impinging on a sensitized screen at one end of the tube. Cathode-ray tubes are used to study the shapes of electric waves, to reproduce images in television receivers, to display alphanumeric and graphical information on computer monitors, as an indicator in radar sets, etc.

Answer 4

hi
cathode ray tube is device which converts electrical signal into visualised spots.
by that we can measure & know the amplitude& phase of signal that is given as input for this device.not only those two but we can measure most of the parameters like frequency.

Answer 5

The base for Television. Please refer to the following URL for detailed information.
http://en.wikipedia.org/wiki/Cathode_Ray_Tube