Doppler effect


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Related to Doppler effect: Doppler radar, CT scan, MRI

Doppler effect

 [dop´ler]
the relationship of the apparent frequency of waves, as of sound, light, and radio waves, to the relative motion of the source of the waves and the observer, the frequency increasing as the two approach each other and decreasing as they move apart.

The Doppler effect can be experienced when a train whistle or automobile horn produces a continuous sound as it approaches and passes a listener. The pitch of the sound suddenly falls as the source passes the listener.

Dopp·ler ef·fect

(dop'lĕr),
a change in frequency observed when the sound source and observer are in relative motion away from or toward each other.
See also: Doppler shift.
Synonym(s): Doppler phenomenon

Dopp·ler ef·fect

(dop'lĕr e-fekt')
A change in frequency observed when the sound and observer are in relative motion away from or toward each other.
See also: Doppler shift

Doppler effect

A change in the frequency of waves, such as sound or light, received by an observer, when the source is moving relative to the observer. The frequency increases when the source is approaching and decreases when it is retreating. The Doppler effect is used in a number of medical applications including measurement of blood flow and investigation of dynamic heart function. (Christian Johann Doppler, 1803–53, Austrian physicist).

Doppler effect

The principle that the sound of an object moving toward you has a higher pitch than the sound when it is moving away from you.

Doppler,

Christian J., Austrian mathematician and physicist in U.S., 1803-1853.
Doppler bidirectional test
Doppler echocardiography - use of Doppler ultrasonography techniques to augment two-dimensional echocardiography by allowing velocities to be registered within the echocardiographic image. Synonym(s): duplex echocardiography
Doppler effect - a change in frequency is observed when the sound and observer are in relative motion away from or toward each other. Synonym(s): Doppler phenomenon; Doppler principle
Doppler flow test
Doppler measurement
Doppler phenomenon - Synonym(s): Doppler effect
Doppler principle - Synonym(s): Doppler effect
Doppler probe
Doppler pulse evaluation
Doppler scope
Doppler shift - the magnitude of the frequency change in hertz when sound and observer are in relative motion away from or toward each other.
Doppler ultrasonography - application of the Doppler effect in ultrasound to detect movement of scatterers (usually red blood cells) by the analysis of the change in frequency of the returning echoes.
Doppler ultrasound flowmeter
Doppler ultrasound segmental blood pressure testing
References in periodicals archive ?
Thus, the Doppler Effect influence on network performance can be analyzed for the conclusion.
In this work, we evaluate the "performance anomaly" by accounting for the Doppler effect and the dynamic coordination scheme on the multi-channel MAC of the IEEE 1609.4 standard.
For the Doppler Effect, [f.sub.2] is the ultrasound frequency received by the moving particles in the fluid and [f.sub.3] is the ultrasound frequency received by the receiving sensor.
Although the Doppler effect has been removed, identifying the FCF from the Doppler-free signal still remains difficult.
The Doppler Effect, after all, isn't a word one tries to fit into a sentence most days.
We are familiar with the Doppler Effect in everyday life.
Terrestrial and maritime vehicles travel relatively slow so the Doppler Effect does not come into play.
When there is a motion between these nodes leads to the Doppler effect. In the physical layer, a well-designed preamble and a Doppler scaling factor estimation algorithm are adopted to measure the relative velocities of one sensor node to the others.
This nomenclature comes from the phenomenon known as the Doppler effect, which relates to how wave frequencies change when the source of those waves is moving relative to a person or object.
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SARABAND'S SELECTIONS CARLISLE: 2.00 Another Royal, 2.30 Doppler Effect, 3.05 Mission Impossible, 3.40 Great Wave, 4.15 Clouds Rest, 4.50 Correggio, 5.20 Saint Thomas.
Using the Doppler Effect, which shifts the star's light spectrum depending on its velocity, the scientists can work out some properties of these planets, such as their masses and periods of orbit.

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