Doppler shift

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Dopp·ler shift

(dop'lĕr),
the magnitude of the frequency change in hertz when sound and observer are in relative motion away from or toward each other.
See also: Doppler effect.

Doppler shift

Dopp·ler shift

(dop'lĕr shift)
The magnitude of the frequency change in hertz when sound and observer are in relative motion away from or toward each other.
See also: Doppler effect

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

Doppler

an Austrian physicist and mathematician.

duplex Doppler imaging
Doppler effect
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.
Doppler shift
the change in frequency that occurs when high frequency sound waves are reflected from a moving surface; the basis for doppler ultrasound.
References in periodicals archive ?
with respect to the 3-space; with 1/(1 - v/(c + V cos [theta])) and 1/(1 + v/(c - V cos [theta])) being the Doppler shift factors as the photons have speed c [+ or -] V cos [theta] with respect to the detectors frame of reference; and 1/(1 - [V.
This result uses only the neo-Lorentz Doppler shift factors, and these have been confirmed by analysis of the Earth-flyby Doppler shift data [6].
The device measures a Doppler shift when movement beneath the probe is detected.
Doppler shift, used as an index of sternal skin stress, was recorded continuously as the subject performed three trials of each lift.
Doppler shift was recorded as the subjects performed supine-to-sit and sit-to-stand, each using a technique discouraged as part of sternal precautions and using the technique promoted as part of sternal precautions.
The data shows remarkable agreement with the velocity vector from the flyby Doppler shift data, see Fig.
8 (top), with the data compared with predictions for the sidereal effect only from the flyby Doppler shift data.
This is possible because the inflow component is radially inward and so changes direction relative to the other flow components during a flyby, making the flyby Doppler shifts sensitive to the inflow speed.
infnity]] is the putative "excess speed" anomaly deduced by assuming that the speed of light is isotropic in modeling the Doppler shifts, as in (31).
Another recently discovered technique is to use the Doppler shift data from spacecraft earth-flybys [19].
However Doppler shift observations of spacecraft, such as Galileo, NEAR, Cassini, Rosetta and MESSENGER in earth flybys, have all revealed unexplained speed "anomalies"--that the Doppler-shift determined speeds are inconsistent with expected speeds [1-6].
The spacecraft Doppler shift anomalies are shown herein to give another technique that may be used to measure the anisotropy of the speed of light, and give results consistent with previous detections.