Doppler, Christian J.

(redirected from Doppler principle)


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 ?
At present, the clinical application of Doppler principle to ultrasound and its employment in the investigation of blood flow velocities has revolutionized the study of human fetal circulation dynamics.
Those struggling to understand the Doppler principle will be interested to know that while Doppler's postulate concerning frequency shift from moving objects was ultimately shown to be correct his extrapolation about color shift of light from stars was later proven to be wrong.
Secondly, flow and flow patterns in blood vessels or chambers may be studied when the Doppler principle is applied to ultrasound.
According to the Doppler principle, the moving red blood cell backscattered light rays are subjected to a frequency shift where this is not the case for static tissue.
The Doppler principle causes the frequency received by the radar to change by an amount proportional to the rate of change of range.
A meter utilizing the Doppler principle requires "particles" in the flow stream to reflect waves.
So, utilizing the Doppler principle, we are able to measure our universe and gauge the speed with which we approach or depart any other star system in the universe.
If a radar uses coherent signals, the Doppler principle allows it to determine the rate of change of distance to a target.
According to the Doppler principle (see the "EW 101" in your May 1995 JED), the reflected radar return signal from everything within the radar's antenna beam will be changed in frequency.
They do this by taking advantage of the Doppler principle.