critical frequency

简明释义

临界频率

英英释义

例句

1.The radio signal was lost because it fell below the critical frequency (临界频率) required for clear transmission.

由于无线电信号低于所需的critical frequency（临界频率），信号丢失了。

2.Engineers must calculate the critical frequency (临界频率) to ensure the stability of the communication system.

工程师必须计算critical frequency（临界频率）以确保通信系统的稳定性。

3.The critical frequency (临界频率) determines how high a signal can be transmitted without distortion.

critical frequency（临界频率）决定了信号在不失真的情况下可以传输的最大高度。

4.Understanding the critical frequency (临界频率) is essential for designing effective antennas.

理解critical frequency（临界频率）对于设计有效的天线至关重要。

5.The critical frequency (临界频率) for this particular medium is significantly lower than expected.

这个特定介质的critical frequency（临界频率）显著低于预期。

作文

In the field of telecommunications and radio wave propagation, the term critical frequency refers to the highest frequency at which a radio wave can be transmitted vertically and still be reflected back to Earth by the ionosphere. This phenomenon occurs due to the ionization of the upper atmosphere, which creates layers that can reflect certain frequencies while allowing others to pass through. Understanding critical frequency is vital for effective communication, especially for long-distance radio transmissions. When we talk about the critical frequency, it is important to consider its dependence on various factors such as time of day, season, and solar activity. During the day, the ionosphere is more ionized due to sunlight, which increases the critical frequency. Conversely, at night, the ionization decreases, leading to a lower critical frequency. This variation affects how radio signals are transmitted and received, making it crucial for operators to adjust their equipment accordingly.For amateur radio operators, understanding critical frequency can significantly enhance their ability to communicate over long distances. By selecting frequencies that are below the current critical frequency, operators can ensure that their signals will be reflected back to Earth rather than escaping into space. This knowledge allows them to choose the optimal times for transmission and increases the chances of successful communication.Moreover, the concept of critical frequency is not only limited to radio communications but also applies to other technologies like satellite communications and GPS systems. For instance, when satellites communicate with ground stations, they must account for the critical frequency to avoid signal loss. If the frequency used for communication exceeds the critical frequency, the signal may not be successfully reflected back to the receiving station, resulting in a failed connection.In addition to practical applications, the study of critical frequency has implications for scientific research as well. Researchers use measurements of the critical frequency to gather data about the ionosphere's properties and behavior. This information helps scientists understand atmospheric changes, predict weather patterns, and even improve navigation systems.In conclusion, the term critical frequency is a key concept in the realm of radio wave propagation and telecommunications. Its significance spans various fields, from amateur radio to satellite communications and scientific research. By grasping the fundamentals of critical frequency, individuals and organizations can optimize their communication strategies and contribute to advancements in technology and science. As we continue to explore the complexities of our atmosphere, the importance of understanding concepts like critical frequency will only grow, paving the way for more reliable and efficient communication systems in the future.

在电信和无线电波传播领域，术语critical frequency指的是可以垂直传输并仍然被电离层反射回地球的最高频率。这种现象是由于上层大气的电离，形成了可以反射某些频率而允许其他频率通过的层。理解critical frequency对于有效通信至关重要，尤其是在远距离无线电传输中。当我们谈论critical frequency时，考虑其依赖于时间、季节和太阳活动等各种因素是很重要的。在白天，由于阳光的照射，电离层的电离程度更高，这增加了critical frequency。相反，在夜间，电离程度降低，导致critical frequency下降。这种变化影响无线电信号的传输和接收，使操作员必须相应调整设备。对于业余无线电操作员来说，理解critical frequency可以显著增强他们进行远距离通信的能力。通过选择低于当前critical frequency的频率，操作员可以确保他们的信号会被反射回地球，而不是逃逸到太空。这种知识使他们能够选择最佳的传输时间，从而增加成功通信的机会。此外，critical frequency的概念不仅限于无线电通信，还适用于其他技术，如卫星通信和GPS系统。例如，当卫星与地面站通信时，它们必须考虑critical frequency以避免信号丢失。如果用于通信的频率超过critical frequency，则信号可能无法成功反射回接收站，从而导致连接失败。除了实际应用之外，critical frequency的研究还对科学研究有着重要意义。研究人员使用critical frequency的测量值来收集关于电离层特性和行为的数据。这些信息帮助科学家了解大气变化、预测天气模式，甚至改善导航系统。总之，术语critical frequency是在无线电波传播和电信领域的一个关键概念。它的重要性跨越多个领域，从业余无线电到卫星通信和科学研究。通过掌握critical frequency的基本知识，个人和组织可以优化其通信策略，并为技术和科学的进步做出贡献。随着我们继续探索大气的复杂性，理解像critical frequency这样的概念的重要性将只会增加，为未来更可靠和高效的通信系统铺平道路。