Doppler effect


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

Synonyms for Doppler effect

change in the apparent frequency of a wave as observer and source move toward or away from each other

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References in periodicals archive ?
In other words, a receiver that is moving with the same speed as the emitter does not observe a Doppler effect and cannot discover the motion.
This apparently contrasts with the conventional Doppler effect where wavelengths will be [MATHEMATICAL EXPRESSION NOT REPRODUCIBLE IN ASCII] (1 - v/c) and [[lambda].
If the notion of expanding universe cannot be explained satisfactorily, it is difficult to imagine that Doppler effects are the cause of observed Hubble's law.
However, instead of using a spatially varying magnetic field along the length of a solenoid to compensate for the Doppler effect, this group of researchers changes the frequency of the laser light.
Melbourne, Mar 7 (ANI): For the first time ever, researchers have demonstrated a reversal of the optical Doppler effect, an advance that could lead to the development of 'invisibility cloak' technology.
The new WSR-88D radar uses the Doppler effect to measure radial wind speed and velocity, and can detect the circular motion characteristic of mesocyclones, the parent circulation of most tornadoes, as well as the unique radar Tornadic Vortex Signature (TVS) that indicates the formation of a tornado.
As the movement of the atoms leads to very large frequency shifts through the Doppler effect, in the best of these clocks, the atoms are slowed down to a hundredth of the speed of a pedestrian in a first preparation step with the aid of laser cooling.
In typical supernova explosions, light from different chemical elements is smeared out across the electromagnetic spectrum by the Doppler effect.
Not only does spectroscopy reveal the identity of the atoms in the star (each element emits light at a certain characteristic frequency), it can also tell researchers how fast the star is moving away or toward Earth, courtesy of the Doppler effect, which occurs whenever a source of waves is itself in motion.
With help of the Doppler effect, the researchers were able to pick even the sub-centimetre changes in movement caused by a beating heart or the motion of the lungs.
The new WSR-88D radar uses the Doppler effect to measure radial wind speed and velocity and can detect the circular motion characteristic of mesocyclones, the parent circulation of most tornadoes, as well as the unique radar Tornadic Vortex Signature (TVS) that indicates the formation of a tornado.
Color Doppler technology is designed to use the Doppler effect to image moving blood and remove the many Doppler signals from moving cardiac tissue.
In addition, by measuring the shift in frequency of returning radar signals, the system can make use of the Doppler effect to determine radial wind speed and direction.
Because of its higher sensitivity, the new radar generates more accurate information on severe storms and also can provide previously unavailable information on wind velocity, direction and turbulence using the Doppler effect, a capability that the older WSR-57 radars do not have.
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