noise temperature

简明释义

噪声温度

英英释义

例句

1.Engineers often aim for a noise temperature 噪声温度 below 50 K in satellite communications.

工程师们通常希望在卫星通信中将 噪声温度 noise temperature 控制在50K以下。

2.We need to measure the noise temperature 噪声温度 to optimize the antenna design.

我们需要测量 噪声温度 noise temperature 以优化天线设计。

3.A lower noise temperature 噪声温度 indicates better sensitivity in a radio receiver.

较低的 噪声温度 noise temperature 表示无线电接收器的灵敏度更好。

4.The noise temperature 噪声温度 of the amplifier can greatly influence the overall system noise figure.

放大器的 噪声温度 noise temperature 会极大影响整体系统的噪声指数。

5.The receiver's performance is significantly affected by the noise temperature 噪声温度 of the environment.

接收器的性能受到环境的 噪声温度 noise temperature 的显著影响。

作文

In the field of electronics and telecommunications, understanding the concept of noise temperature is crucial for designing efficient systems. Noise temperature refers to a measure of the amount of thermal noise generated by a device or system, expressed in terms of temperature. It is a vital parameter that helps engineers evaluate the performance of amplifiers, receivers, and other electronic components. The significance of noise temperature lies in its ability to provide insights into how much noise a component introduces into a signal, which can ultimately affect the quality of communication systems.At its core, noise temperature quantifies the noise power produced by a device at a specific temperature. This concept is derived from the principles of thermodynamics and statistical mechanics, where thermal noise is generated by the random motion of charge carriers in a conductor. The relationship between noise and temperature is described by the Johnson-Nyquist noise formula, which states that the noise voltage across a resistor is proportional to the square root of the temperature in Kelvin. This means that as the temperature increases, so does the thermal noise, leading to a higher noise temperature.For engineers, measuring noise temperature is essential when assessing the overall performance of a communication system. A lower noise temperature indicates better performance, as it signifies that the system introduces less noise into the signal being processed. This is particularly important in applications such as radio astronomy, where faint signals from distant celestial bodies must be detected against a backdrop of noise. In such cases, even a small increase in noise temperature can significantly degrade the quality of the received signal.Furthermore, noise temperature plays a critical role in determining the sensitivity of receivers. The sensitivity of a receiver is defined as its ability to detect weak signals, and this is directly influenced by the noise temperature of the receiver itself. Engineers strive to design receivers with low noise temperature to enhance their sensitivity and improve overall system performance. Techniques such as cooling components to cryogenic temperatures are often employed to achieve this goal, as lower temperatures lead to reduced thermal noise.In addition to its importance in communication systems, noise temperature is also relevant in various scientific fields, including astrophysics and quantum mechanics. Researchers studying cosmic microwave background radiation, for example, must account for the noise temperature of their instruments to accurately interpret the data collected from the universe. Similarly, experiments in quantum mechanics often require precise measurements of noise temperature to understand phenomena at the quantum level.In conclusion, the concept of noise temperature is a fundamental aspect of modern electronics and telecommunications. Its ability to quantify thermal noise allows engineers to assess and optimize the performance of various systems. Whether in the realm of communication technology or scientific research, understanding noise temperature is essential for ensuring high-quality signal processing and accurate data interpretation. As technology continues to advance, the significance of noise temperature will only grow, making it a key consideration for future innovations in the field.

在电子和电信领域，理解“噪声温度”这一概念对于设计高效的系统至关重要。“噪声温度”指的是由设备或系统产生的热噪声量的测量，以温度为单位表示。它是一个重要的参数，帮助工程师评估放大器、接收器和其他电子元件的性能。“噪声温度”的重要性在于它能够提供关于组件对信号引入多少噪声的见解，这最终会影响通信系统的质量。从本质上讲，“噪声温度”量化了设备在特定温度下产生的噪声功率。这个概念源于热力学和统计力学的原理，其中热噪声是由导体中电荷载流子随机运动产生的。噪声与温度之间的关系由约翰逊-奈奎斯特噪声公式描述，该公式指出，电阻器上的噪声电压与开尔文温度的平方根成正比。这意味着随着温度的升高，热噪声也会增加，从而导致更高的“噪声温度”。对于工程师而言，测量“噪声温度”在评估通信系统的整体性能时至关重要。较低的“噪声温度”表明更好的性能，因为这意味着系统向被处理信号中引入的噪声较少。这在射电天文学等应用中特别重要，在这些情况下，来自遥远天体的微弱信号必须在噪声背景下被检测到。在这种情况下，即使是“噪声温度”的微小增加也会显著降低接收信号的质量。此外，“噪声温度”在确定接收器灵敏度方面也发挥着关键作用。接收器的灵敏度定义为其检测微弱信号的能力，而这直接受到接收器自身“噪声温度”的影响。工程师们努力设计具有低“噪声温度”的接收器，以增强其灵敏度并提高整体系统性能。通常采用冷却组件到低温的方法来实现这一目标，因为较低的温度会导致热噪声减少。除了在通信系统中的重要性外，“噪声温度”在包括天体物理学和量子力学在内的多个科学领域也相关。研究宇宙微波背景辐射的研究人员，例如，必须考虑他们仪器的“噪声温度”，以准确解释从宇宙收集的数据。类似地，量子力学中的实验通常需要精确测量“噪声温度”，以了解量子层面的现象。总之，“噪声温度”的概念是现代电子学和电信的基本方面。它量化热噪声的能力使工程师能够评估和优化各种系统的性能。无论是在通信技术领域还是科学研究中，理解“噪声温度”对于确保高质量信号处理和准确数据解释至关重要。随着技术的不断进步，“噪声温度”的重要性将只会增加，使其成为未来该领域创新的关键考虑因素。