图形学射线相交算法_计算机图形学中的阴极射线管

图形学射线相交算法

阴极射线管 (Cathode Ray Tube)

Ferdinand Barun of Strasbourg developed the cathode ray tube in the year 1897. It used as an oscilloscope to view and measure some electrical signals. But several other technologies exist and solid state moving may eventually predominate. General a cathode ray tube is s special type of vacuum tube in which some images are produced. The images are generated when an electron beam strikes on the phosphorescent surface. Most of the old types of computer desktop and television display use the cathode ray tube. The CRT used in the computer display is like a picture tube in a television.

斯特拉斯堡的费迪南德·巴伦 ( Ferdinand Barun)于1897年开发了阴极射线管 。它用作示波器来查看和测量一些电信号。但是存在其他几种技术，固态移动最终可能会占主导地位。通常，阴极射线管是一种特殊的真空管，在其中产生一些图像。当电子束撞击磷光表面时会生成图像。大多数台式计算机和电视显示器的旧类型都使用阴极射线管。计算机显示器中使用的CRT就像电视机中的显像管。

In the computer system, there are several modes of computer display or sets of specification on which the CRT operates. The most commonly used specification for CRT display is known as SVGA( super video graphics Array). the laptop uses the liquid crystal display. The technology used in the modern computers and the television of LCD are different.

在计算机系统中，CRT在其上运行几种计算机显示模式或一组规范。 CRT显示最常用的规范是SVGA(超级视频图形阵列)。笔记本电脑使用液晶显示器。现代计算机和LCD电视使用的技术不同。

阴极射线管的组成 (Components of cathode ray tube)

The cathode ray tube can be divided into the three sections:

阴极射线管可分为三个部分：

1. Electron Gun

1.电子枪

The major role of this section is to produce electron at a very high velocity. The whole process is done by a process name thermionic emission.
该部分的主要作用是以很高的速度产生电子。整个过程由过程名称“热电子发射”完成。
The filament present in the cathode tube is heated to a fixed point where the electrons become loose.
阴极管中存在的灯丝被加热到电子变松的固定点。
An anode of the high speed is applied to it and the electrons move toward the screen due to electrostatic attraction.
对其施加高速阳极，由于静电吸引，电子向屏幕移动。
The brightness of the image is controlled by the electron passes through a series of the control grid.
图像的亮度由电子通过一系列控制网格控制。
If the grid is more negative then the image is darker or vice versa.
如果网格更负，则图像更暗，反之亦然。

2. Deflection system

2.偏转系统

The deflection system controls the images which are produced by controlling the position of the electron that hot the screen.
偏转系统控制通过控制加热屏幕的电子的位置而产生的图像。
It consists of two perpendicular set of electric and magnetic fields and it control both the horizontal and vertical axes.
它由两组垂直的电场和磁场组成，并控制水平和垂直轴。
When the voltage applied to the field is controlled then it is possible to vary deflection through electrostatic force or motor effect.
当施加到磁场的电压受到控制时，就有可能通过静电力或电机效应来改变偏转。

3. Fluorescent screen

3.荧光屏

This screen display where the electrons are hitting the cathode ray tube.
该屏幕显示电子撞击阴极射线管的位置。
This screen is coated with a material that emits light when it struck by electrons.
该屏幕涂有一层材料，当它被电子撞击时会发光。
The two commonly used materials are zinc sulfide or phosphorus.
两种常用材料是硫化锌或磷。

阴极射线管的应用 (Application of cathode ray tube)

The cathode ray tube is used to create a moving image.
阴极射线管用于创建运动图像。
The CRT TV works by moving the electron beam scan the screen at a faster rate.
CRT电视通过移动电子束以更快的速度扫描屏幕来工作。
It is used in the cathode ray oscilloscope.
它用于阴极射线示波器。
It is used as a display device in radar.
它用作雷达中的显示设备。
It is used in computer monitors and some television.
它用于计算机监视器和某些电视。

阴极射线管的优点 (Advantages of cathode ray tube)

It operates at any resolution and at an aspect ratio.
它可以任何分辨率和高宽比运行。
CRT runs at the highest pixel resolution.
CRT以最高像素分辨率运行。
Cathode ray tube produces a very dark black and the highest contrast level.
阴极射线管产生非常暗的黑色和最高的对比度。
CRT is best suited for rapidly moving or changing the image and have a fast response time.
CRT最适合快速移动或更改图像并具有快速响应时间。
CRT is less expensive than any other display technology.
CRT比其他任何显示技术都便宜。

阴极射线管的缺点 (Disadvantages of cathode ray tube)

It is relatively bright but not as LCD's brightness.
它相对较亮，但不如LCD的亮度。
Some CRTs are round spherical or cylindrical shapes but new CRTs are flat.
一些CRT是圆形的球形或圆柱形，但是新的CRT是平坦的。
They are very large heavy and bulgy.
他们很大很笨重。
They also consume a lot of electricity and produce a heat.
它们还会消耗大量电能并产生热量。