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.
Farlex Partner Medical Dictionary © Farlex 2012

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
Medical Dictionary for the Health Professions and Nursing © Farlex 2012

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
Medical Eponyms © Farlex 2012
References in periodicals archive ?
Thus, oscillations cannot explain the Doppler shifts, and the existence of a planet remains the only viable conclusion.
The performance is decline because Delay Spread: Frequency Selective Fading causing the Inter-Symbol Interference (ISI) and the signal power to be weakened and because Doppler Shift causing the frequency signal wave to be changed or distorted.
The Doppler estimation unit calculates the mean and standard deviation values ([[DELTA].sub.M] and [[DELTA].sub.D]) from the measured short-term Doppler shifts. According to the values of Am and Ad, the resampling range is extended as 1/(1 - [[DELTA].sub.M] - [[DELTA].sub.D]), ..., 1/(1 + [[DELTA].sub.M]), ..., 1/(1 + [[DELTA].sub.M] + [[DELTA].sub.D]).
The velocity of irregularities caused by plasma instabilities can be obtained from the Doppler shift of the HFSWR coherent backscatter signal:
The geometry factor is fixed during dominant multipath lifetime, and, through it, the temporal evolution of delay and Doppler shifts can be calculated by (5) and (6).
This result was confirmed by other experiments: Miller 1925/26 gas mode Michelson interferometer, DeWitte 1991 coaxial cable RF speeds, Cahill 2009 Satellite Earth-flyby Doppler shift NASA data [6], Cahill 2012 dual coaxial cable RF speed [7], Cahill 2013-2014 [8,9] Zener diode 3-space quantum detectors.
Aside from that, the addition of a simple error correcting code and double interleaving improves the system BER performance significantly, especially at high Doppler shifts. With normalized maximum Doppler shift at source branch = 0.2, using CI-CDI system, the total performance improvement can produce a reduction in the error floor by more than two decades provided that the normalized maximum Doppler shift at relay branch does not exceed 0.4.
Given the random time-varying characteristic of the ionospheric medium, the multi-path time delay and Doppler shift effects are the main features for the HF radar wave propagating through the ionosphere [2].
Doppler shift caused by skin acceleration was recorded during each procedure.
1(a) and (b), the predicted Doppler shifts from linear surfaces, in which the HM is not considered, are compared with the numerical simulations performed by Toporkov et al.
Color flow Doppler ultrasound produces a color-coded map of Doppler shifts superimposed onto a B-mode ultrasound image.