change in the apparent frequency of a wave as observer and source move toward or away from each other

The Doppler effect is widely used in astronomy for measuring the velocity at which distant stars or nebulae are approaching or receding.

多普勒效应在天文学上广泛应用于测量距离遥远的恒星或星云靠近我们或离开我们速度。

The relativistic Doppler effect for light waves is formulated exactly by 4-vector transformation.

利用四维波矢变换可以严格推导狭义相对论多普勒效应的计算公式。

A remote measurement system of solid surface displacement by laser Doppler effect of grating which was used to produce beat frequency is discussed.

研究了利用运动光栅的多普勒效应进行切向位移的遥测技术。

The influences of Doppler effect on radio fuze performance in different cases of missile-target encounter and velocity compensation were analyzed.

探讨了不同弹目交会情况下多普勒效应对无线电引信性能的影响及速度补偿问题。

It is caused by the Doppler effect (something similar happens when a police car or fire engine with its siren blaring drives past you, and the pitch of the sound suddenly drops).

这是由多普勒效应(类似一辆警车或消防车鸣着警笛从你身边经过，之后音高突然下降)引起的。

The negative Doppler effect will limits the power to an acceptable level during the time delay for protective action.

多普勒负反应性反馈效应能在保护动作延迟的时间内将功率限制在可接受的水平。

Doppler wind lidar is an efficiency tool of measuring atmosphere wind field, Using Doppler effect is considered as one of the most advanced technology of measuring wind field.

激光多普勒雷达系统是测量大气风场有效的工具，利用激光多普勒效应进行测风是目前最先进的测量风场的技术之一。

Embolic detection can be used for early diagnosis of cerebrovascular disease. The Doppler effect of ultrasound is a non-invasive means for the detection of emboli.

血栓的準确检测可以用于早期脑血管疾病的诊断，超声多普勒是一种无损的血栓检测技术。

A new testing method is introduced in the paper, the speed and displacement single grating measuring system has been realized by using Doppler effect of grating moving.

本文介绍一种新的测试方法，利用光栅运动的多普勒效应，实现速度或位移测量的单光栅测量系统。

Suddenly they do the Doppler effect where they turn their backs to you, in a way, and they「re marching away from you and you hear very little sound.

突然，他们也产生了多普勒效应，当他们转身背对你时，当他们背离你前进时，你会听到一种很微弱的声音。

One of the main methods of fetal monitoring is monitoring the fetal heart rate (FHR), and the method based on Ultrasonic Doppler effect is a effective method without wound to detect the FHR.

监听胎儿心率是胎儿监护的主要方法之一，基于超声多普勒效应的胎心率检测法是一种有效的无创方法。

Doppler effect can be demonstrated by manufactured device when the sound source is in circular motion. The frequency spectrum is gained with chart spectrum analysis software.

利用自制装置演示了声源作圆周运动的多普勒效应，并应用图谱分析软件得到频率分布图。

The results show that the formula for the transverse Doppler effect is incorrect in many texts and literatures.

结果表明常见教科书和文献中关于横向多普勒效应的定义和计算公式是不正确的。

There are different formulae for Doppler effect using different frames of reference in literatures.

由于所用参考系不同，因而各种文献给出了不同形式的多普勒效应表达式。

This article put a stress on the principle of Doppler effect and its application to astronomy, radar, transportation, medical treatment, etc.

本文重点讨论了多普勒效应的原理以及它在天文学、雷达、交通、医疗等方面的应用。

The superposition property of elastic wave」s Doppler effect and the influence of relativistic time dilation and length contraction on elastic wave's Doppler effect are also discussed.

讨论了弹性波多普勒效应的叠加性质，并指出相对论的时间膨胀和长度收缩对弹性波多普勒效应的影响。

The Doppler effect is used to discover extrasolar planets.

都卜勒效应通常用于探索太阳系外行星。

Explore the Doppler effect in a binary pulsar system by downloading the 「Pulsating Science」 3d visualisation software.

您可以下载一款名为「PulsatingScience」的3维可视软件来探索脉沖双星系统中的多普勒效应。

Wind farm turbines create a Doppler effect as they rotate, creating a potential radar blackout zone.

风力涡轮机在旋转过程中产生多普勒效应，形成一个潜在的雷达中断区。