doppler effect

简明释义

多普勒效应

英英释义

例句

1.The doppler effect (多普勒效应) is crucial in radar technology for measuring the speed of objects.

在雷达技术中，多普勒效应对于测量物体速度至关重要。

2.The sound of a passing ambulance changes pitch due to the doppler effect (多普勒效应).

经过的救护车的声音因<意>多普勒效应而改变音调。

3.When a train approaches, you hear a higher pitch that drops as it passes due to the doppler effect (多普勒效应).

当火车接近时，你会听到更高的音调，而在它经过时音调下降，这就是多普勒效应。

4.Astronomers use the doppler effect (多普勒效应) to determine whether stars are moving towards or away from Earth.

天文学家利用多普勒效应来判断星星是朝向地球还是远离地球移动。

5.Medical ultrasound machines utilize the doppler effect (多普勒效应) to visualize blood flow.

医学超声波机器利用多普勒效应来可视化血流。

作文

The Doppler effect is a fascinating phenomenon that occurs when there is a change in frequency or wavelength of a wave in relation to an observer who is moving relative to the wave source. This effect is commonly experienced in our daily lives, particularly with sound waves. For instance, when an ambulance approaches with its sirens blaring, we notice that the sound is higher in pitch as it comes closer and then drops in pitch as it moves away. This change in sound is a direct result of the Doppler effect. The concept was first introduced by the Austrian physicist Christian Doppler in 1842, and it has since become a fundamental principle in various fields such as astronomy, radar technology, and medical imaging.In astronomy, the Doppler effect plays a crucial role in understanding the movement of stars and galaxies. By observing the light emitted from these celestial bodies, scientists can determine whether they are moving towards or away from Earth. When a star moves away from us, the light waves are stretched, causing a shift towards the red end of the spectrum, known as redshift. Conversely, if a star is moving towards us, the light waves are compressed, resulting in a shift towards the blue end of the spectrum, called blueshift. This information is vital for astronomers to study the expansion of the universe and the motion of galaxies.In addition to its applications in astronomy, the Doppler effect is also utilized in radar technology. Police use radar guns to measure the speed of moving vehicles. As a car approaches the radar device, the frequency of the reflected waves increases, indicating that the vehicle is moving closer. When the car moves away, the frequency decreases. This principle allows law enforcement to accurately gauge the speed of vehicles on the road, helping to maintain safety and enforce speed limits.Medical imaging techniques, such as Doppler ultrasound, also rely on the Doppler effect. This non-invasive method allows doctors to observe blood flow in real-time. By sending sound waves into the body and measuring the frequency changes of the reflected waves, physicians can assess the health of the cardiovascular system. This application is particularly important for diagnosing conditions like blood clots or heart valve issues.The implications of the Doppler effect extend beyond scientific observation; it also enhances our understanding of various technologies that influence our everyday lives. For example, the effect is used in weather forecasting to track storm systems. Doppler radar can detect the movement of precipitation and provide real-time updates on severe weather conditions. This technology has proven invaluable in saving lives during natural disasters by providing timely warnings.In conclusion, the Doppler effect is a remarkable phenomenon that bridges the gap between physics and practical applications. From the sounds we hear in our environment to the advanced technologies used in medicine and astronomy, the Doppler effect enriches our understanding of the world around us. Its significance is evident in many aspects of modern life, making it an essential concept to grasp for anyone interested in science and technology.

多普勒效应是一个迷人的现象，当观察者相对于波源移动时，波的频率或波长发生变化。这种效应在我们的日常生活中很常见，尤其是在声音波中。例如，当一辆救护车靠近时，我们会注意到声音的音调在接近时更高，然后在远离时下降。这种声音变化正是多普勒效应的直接结果。这个概念最初是由奥地利物理学家克里斯蒂安·多普勒在1842年提出的，此后它已成为天文学、雷达技术和医学成像等多个领域的基本原理。在天文学中，多普勒效应在理解恒星和星系的运动方面发挥着关键作用。通过观察这些天体发出的光，科学家可以确定它们是朝向地球移动还是远离地球。当一颗恒星远离我们时，光波被拉伸，导致光谱向红色端偏移，这被称为红移。相反，如果一颗恒星朝向我们移动，光波被压缩，导致光谱向蓝色端偏移，这被称为蓝移。这些信息对天文学家研究宇宙膨胀和星系运动至关重要。除了在天文学中的应用外，多普勒效应还被用于雷达技术。警察使用雷达枪测量移动车辆的速度。当一辆车靠近雷达设备时，反射波的频率增加，表明车辆正在接近。当汽车远离时，频率下降。这个原理使执法部门能够准确测量道路上车辆的速度，从而帮助维护安全和执行限速。医学成像技术，如多普勒超声波，也依赖于多普勒效应。这种无创的方法允许医生实时观察血流。通过将声波发送到体内并测量反射波的频率变化，医生可以评估心血管系统的健康。这一应用在诊断血栓或心脏瓣膜问题等情况中特别重要。多普勒效应的影响不仅限于科学观察；它还增强了我们对影响日常生活的各种技术的理解。例如，该效应被用于天气预报，以跟踪风暴系统。多普勒雷达可以检测降水的运动，并提供关于恶劣天气条件的实时更新。这项技术在自然灾害期间提供及时警告，挽救生命方面证明了其不可或缺的价值。总之，多普勒效应是一个了不起的现象，架起了物理学与实际应用之间的桥梁。从我们环境中听到的声音到医学和天文学中使用的先进技术，多普勒效应丰富了我们对周围世界的理解。它的重要性在现代生活的许多方面显而易见，使其成为任何对科学和技术感兴趣的人必须掌握的重要概念。