This is just a short report for a talk in my department.
Thermionic Cathodes were first discovered by Edison in 1883. It was not until 1920 that cathode thermionic emission was found. After several improvements, thermionic cathodes could be used as a device with arc discharge caused by thermionic emission of the cathode, but the temperature was still higher than 1000º C back then. It was not until 2005 that a new method was used for distributing nano-crystalline scandium oxide in the tungsten powder, which helped the cathode achieved emission levels below 970 º C. The goal is to make higher cathode emission with small size, low power, low capacitance for using in computer monitors and high-quality television.
What I have learned from the seminar:
●How thermionic cathodes were changed into high-performance cathode tubes.
●Many applications for using micro-focus high brightness cathodes.
●The need of less surface for radiating heat in thermionic cathodes.
One thing I learned from this talk is how thermionic cathodes plays a very important role in this modern world. One question I have is, once the radiating heat from the surface can be reduced or diminished, what will be the next challenge?
留言列表
