hot cathode

简明释义

热阴极

英英释义

例句

1.In many electron tubes, the hot cathode 热阴极 is heated to provide a steady flow of electrons.

在许多电子管中，<顺义热阴极>被加热以提供稳定的电子流。

2.The performance of the device improved significantly after switching to a hot cathode 热阴极 design.

在更换为<顺义热阴极>设计后，设备的性能显著提高。

3.The vacuum tube operates efficiently with a hot cathode 热阴极 that emits electrons.

真空管通过一个<顺义热阴极>来有效工作，发射电子。

4.The hot cathode 热阴极 emits a cloud of electrons when it is heated to a high temperature.

当<顺义热阴极>加热到高温时，会发出一团电子。

5.A hot cathode 热阴极 is essential for achieving high efficiency in gas discharge lamps.

在气体放电灯中，<顺义热阴极>对于实现高效率是必不可少的。

作文

The term hot cathode refers to a type of cathode that is heated to produce electrons through thermionic emission. This process is essential in various applications, particularly in vacuum tubes and some types of electron microscopes. The heating of the cathode allows it to emit electrons more efficiently than a cold cathode, which relies on other methods such as field emission. In the realm of electronics, understanding the function of a hot cathode is crucial for designing devices that require a stable and reliable source of electrons.Historically, the invention of the hot cathode was a significant advancement in technology. Early vacuum tubes utilized cold cathodes, which were less efficient and required higher voltages to operate. The introduction of the hot cathode allowed for lower operating voltages and improved performance in various electronic circuits. This innovation paved the way for the development of radio technology, amplifiers, and even early computers, which relied heavily on vacuum tube technology.In practical terms, a hot cathode is often made from materials such as tungsten or tantalum, which can withstand high temperatures. When heated to a temperature of around 1000 degrees Celsius, these materials emit electrons into the vacuum of the tube. This emission creates a flow of current that can be controlled and amplified, making the hot cathode an essential component in many electronic devices.Moreover, the hot cathode has applications beyond traditional electronics. In the field of electron microscopy, for instance, a hot cathode is used to generate a focused beam of electrons that can interact with specimens at a microscopic level. This capability allows researchers to observe the fine details of materials and biological samples, leading to advancements in science and medicine.Despite the advantages of hot cathodes, there are also challenges associated with their use. The high temperatures required can lead to wear and tear, reducing the lifespan of the cathode. Additionally, the materials used must be carefully selected to ensure they can handle the thermal stress without degrading. Researchers are continually looking for new materials and designs to improve the efficiency and longevity of hot cathodes.In conclusion, the hot cathode represents a vital component in the world of electronics and microscopy. Its ability to efficiently emit electrons has enabled countless technological advancements, shaping the way we understand and interact with the world around us. As technology continues to evolve, the role of the hot cathode will likely adapt, but its fundamental importance will remain constant. Understanding this concept not only helps in grasping the principles of electronics but also highlights the intricate relationship between heat, materials, and electron flow in various applications.

术语热阴极指的是一种通过热电子发射来产生电子的阴极。这一过程在各种应用中至关重要，特别是在真空管和某些类型的电子显微镜中。加热阴极使其能够比冷阴极更有效地发射电子，后者依赖于其他方法，如场发射。在电子学领域，理解热阴极的功能对于设计需要稳定可靠电子源的设备至关重要。历史上，热阴极的发明是技术上的重大进步。早期的真空管使用冷阴极，这种阴极效率较低，需要更高的工作电压。热阴极的引入允许较低的工作电压，并改善了各种电子电路中的性能。这一创新为无线电技术、放大器甚至早期计算机的发展铺平了道路，这些设备严重依赖于真空管技术。在实际应用中，热阴极通常由钨或钽等材料制成，这些材料能够承受高温。当加热到约1000摄氏度时，这些材料会向管子的真空中发射电子。这种发射产生了可以被控制和放大的电流流动，使得热阴极成为许多电子设备的重要组成部分。此外，热阴极还在传统电子学之外有广泛的应用。例如，在电子显微镜领域，热阴极用于生成聚焦的电子束，该束可以与微观水平的样本相互作用。这一能力使研究人员能够观察材料和生物样本的细微细节，从而推动科学和医学的进步。尽管热阴极具有诸多优势，但其使用也面临挑战。所需的高温可能导致磨损，缩短阴极的使用寿命。此外，所用材料必须经过精心选择，以确保它们能够承受热应力而不降解。研究人员不断寻找新材料和设计，以提高热阴极的效率和耐用性。总之，热阴极在电子学和显微镜领域中代表着一个重要组成部分。它高效发射电子的能力使无数技术进步成为可能，塑造了我们理解和与周围世界互动的方式。随着技术的不断发展，热阴极的角色可能会有所调整，但其基本重要性将始终保持不变。理解这一概念不仅有助于掌握电子学原理，还突显了热、材料和电子流在各种应用中的复杂关系。