Doppler effect

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Related to Doppler radar: Doppler weather radar

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 ?
Tested via Doppler radar, when fired at the 28 Nosler's extremely high velocity, the projectile's actual BC is .604--still admirable, but considerably less than touted.
A few of these records include the monthly local climatological data publication from larger airports, hour-by-hour surface observations from different weather stations, cooperative weather observer reports, various types of Doppler radar images of the incident location, cloud-to-ground lightning strike data for a specific address, tide reports for boating and marine cases, and archived National Weather Service (NWS) bulletins, advisories, warnings, statements, and storm reports.
The two institutes set up the doppler radars in Tokyo's Bunkyo Ward, Yokosuka and Ebina in Kanagawa Prefecture, Kisarazu, Chiba Prefecture, and Hanyu, Saitama Prefecture, in collaboration with the National Defense Academy of Japan and Chuo University.
On Motorola phones with imaging capabilities, the service provides looping Doppler radar within four miles of the selected location.
New generations of high-resolution Doppler radar rely on advanced digital-imaging and object-identification techniques.
The main components include a C-band doppler radar with phased array antenna, a data processor unit, two operator workstations, communication equipment and an inertial navigation unit.
For example, an animation on Doppler radar demonstrates how radio waves are used to gather information about storms.
Based on a millimetre wave Doppler radar, jointly developed by Mitsubishi Electronic Co and Kyoto University, the radar has already succeeded in detecting fog and cloud.
Advanced computers, satellites, and Doppler radar (sound waves used to track storms) have made forecasting more accurate.
The site also will include Doppler radar images for the 50 major metro areas of the U.S.
Doppler radar becomes latest front for television to compete - and serve
Doppler radar is a relatively inexpensive means by which large quantities of flight speed data can be accumulated quickly.