What Is A Cathode Ray Tube?



One of the elements required for the control and repair of electronic equipment is the cathode ray tube. What is a cathode ray tube? What is a cathode ray tube used for? What is a cathode ray oscilloscope and how is it used? Let's examine everything about the cathode ray tube together.


What is a cathode ray tube?

The cathode ray tube is an electronic device that displays the graph, that is, the picture of the signals. It is the cathode ray tube that is found on scuba televisions and allows the image to be reflected on the screen. The cathode ray tube, mostly used in television receivers, was discovered by Sir William Crookes about a hundred years ago. This glass tube, whose air is taken away and its pressure is reduced, enables the formation of the screen by modulating, accelerating and deflecting the electron beams.


Two electrodes are attached to this tube. One of the electrodes is at the tip and one is on the side. These are called cathodes and anodes. The electrodes are connected to the high voltage source, like an induction coil, and then the cathode becomes negative, and the anode becomes positive. Cathode rays create fluorescence on some substances. With the effect of cathode rays, chalk gives an orange diamond and a green color. These colors are fluorescent. Aluminum is often found inside the cathode ray tube. This is because the falling sharp light indicates whether the beam is traveling straight. The magnets placed near the tube can change the path of the rays and this is an indication that the rays carry an electric charge. Although the cathode ray tube looks like an element integrated with the oscilloscope, it is a tool that sheds light on many different scientific studies.




What is the cathode ray tube used for?

The cathode ray tube, a gaseous tube invented by Sir William Crookes et al. The electrons travel straight from the cathode to the anode and travel. As the electron beam quickly scans the path, the picture is formed and reflected on the screen. High voltages are required to operate a cathode ray tube. For this reason, specialists must do this job. Although the cathode ray tube is used in many fields, the area it supports most is scientific and experimental studies. X-rays were discovered by Wilhelm Röntgen in 1895 thanks to cathode rays. Scuba televisions used in the past have been replaced by LCD, LED and plasma screens today.


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How to use a cathode ray oscilloscope?

The cathode ray tube is one of the most important elements of the oscilloscope. The element that creates the image and makes the signals appear graphically is called the cathode ray tube. The tube consists of three main parts. 

  • Electron gun and focus-acceleration elements
  • Vertical and horizontal deflection plates
  • Vacuum housing with a phosphor screen glowing when the electron beam hits

The cathode containing an oxidized layer is heated with filament. Electrons that leave the cathode as a result of warming become free. The control grid in the internal structure of the oscilloscope adjusts and balances the propagation of electrons. The focusing and accelerating anodes then focus the electrons into a fine beam and speed it up.




High-speed electron beams pass between the two plates. The first of the deflection plates deflects electrons in the vertical direction.

The polarity of the voltage also determines the direction of the deflection. The amount determines the amplitude of the same voltage. The electron beam is deflected from left to right depending on the voltage. Thus, the location of the electron beam on the screen will be determined. Since the screen is phosphorous, this drop causes the phosphor to shine. As a result of this glare, the image is transmitted to the screen. This is how oscilloscopes, which enable the signals to be monitored graphically. The tip of the cathode made of nickel is covered with oxide layer.


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The distribution of electrons can sometimes be slow and sometimes fast and scattered. Therefore, images occur at different angles. The control grid is used to control the electron flow.The cathode ray tube is quite large in size. Due to its width and weight, it is not very preferred today. Cathode ray tube oscilloscopes are gradually leaving their places to digital models.

Either digital oscilloscopes or usb oscilloscopes are preferred, especially when field oscilloscopes are required. In addition to viewing the signal in usb and digital oscilloscopes, there are options such as saving or printing. Therefore, they are preferred more frequently in scientific studies, device controls and repairs.


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