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Doppler effect
Doppler effect
Doppler effect Change in frequency of a wave, when there is relative motion between the wave source and the observer. The amount of change depends on the velocities of the wave, source and observer. With a sound wave, the effect is demonstrated by the drop in pitch of a vehicle's siren as it passes an observer. With light, the velocity of the source or observer must be large for an appreciable effect to occur, such as the red shift of a rapidly receding galaxy. This effect was first described in 1842 by the Austrian physicist Christian Johann
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The Inverse Doppler Effect: University of Wisconsin Electrical and Computer Engineering Researchers Add to the Bylaws of Physics.
News Wire article from: AScribe Science News Service; 5/23/2005; 700+ words
; ...where the rules don't quite apply. Take the Doppler effect. The Doppler effect is in use everywhere, everyday. Police...by such material should also produce an inverted Doppler effect. Van der Weide's group, in collaboration with...
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Technique reverses Doppler effect.(Sightings: the outlook for new technology)(Brief Article)
Magazine article from: EDN; 6/10/2004; ; 647 words
; YOU'RE FAMILIAR with the Doppler effect, which causes a downward frequency...that it's possible to cause the Doppler effect to reverse when the radiation...Kingdom have demonstrated a reversed Doppler shift by using a transmission line...
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 "SouthtownStar (Chicago, IL)")
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Doppler effect
Newspaper article from: SouthtownStar (Chicago, IL); 8/26/2008; 700+ words
; ...procedure, known as transcranial Doppler ultrasonography, is a painless...the reflected sound waves ("the Doppler effect"). If there is no blood flow...Memorial Hospital's transcranial Doppler machine, which helps doctors assess...
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Doppler effect in flexible and expandable light waveguide and development of new fiber-optic vibration/acoustic sensor.(RESEARCH)
Magazine article from: Fiber Optic Sensors and Systems; 4/1/2006; 458 words
; ...transmitted through a bent optical fiber is shifted by vibration at the bent region. The phenomenon can be explained as Doppler's effect in flexible and expandable light waveguide. Several configurations of the sensor have been designed, and very...
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Doppler effect enables portable vein finder.(pulse: INNOVATIONS & INNOVATORS)
Magazine article from: EDN; 3/2/2006; ; 483 words
; ...lead-thin ultrasound beam, which a reflector directs into the skin. Signal-processing circuits then use the Doppler effect to distinguish arteries from veins based on the direction of blood flow. The device emits an alert when it locates...
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MEMO PAD: POPPING THE BUBBLE...SHE'LL ALWAYS HAVE PARIS...RADAR'S DOPPLER EFFECT.
Magazine article from: WWD; 1/21/2005; ; 700+ words
; ...Wintour is particularly keen to see what Karl Lagerfeld comes out with for the house on Tuesday. Miles Socha RADAR'S DOPPLER EFFECT: A lot can change in two years. For Maer Roshan, the goal -- launching a pop culture magazine called Radar...
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The Doppler effect of online communities: you can learn to sense when online communities are on their way up or down and what that means for your participation in that community.(libraries in computers)
Magazine article from: Computers in Libraries; 4/1/2008; ; 700+ words
; Every day we all take part in different communities. Home, family, neighborhood, social, religious, regional, political, and professional communities are the most prominent for many of us, and many people identify themselves according to the roles they play in one community or another. Online
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A live 3D ultrasound system with colour Doppler to study the effect of sildenafil on erectile performance in patients with chronic and serious diseases presenting with erectile dysfunction
Magazine article from: European Journal of Contraception & Reproductive Health Care; 6/1/2004; ; 699 words
; ...volumes per second. ECG gating was used for 41) colour-Doppler blood flow data collection. To enable the 41) scans to be...observed in real time by using live 3D ultrasonography and Colour Doppler. This method also offers a potential means of volumetric quantitation...
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Beam broadening effect on oblique MST radar Doppler spectrum
Magazine article from: Journal of Atmospheric and Oceanic Technology; 12/1/2002; ; 700+ words
; ...thoroughly from the observed Doppler spectral width before the...Recently, by considering the effects of finite beamwidth together...estimate their contributions to Doppler spectral width. His result...neglecting the wind shear effect, the beam broadening spectral...beam broadening effect ...
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Effects of Wind Field Inhomogeneities on Doppler Beam Swinging Revealed by an Imaging Radar
Magazine article from: Journal of Atmospheric and Oceanic Technology; 8/1/2008; ; 700+ words
; ABSTRACT In this work, the accuracy of the Doppler beam-swinging (DBS) technique for wind measurements is...obtaining profiles of the three-dimensional wind field is the Doppler beam-swinging (DBS) method, where the antenna beam is...
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Doppler Effect
Encyclopedia entry from: The Gale Encyclopedia of Science
Doppler Effect Doppler effect in sound waves Doppler effects in light waves Other uses of the Doppler...the pitches clearly demonstrated the Doppler wave effect. Doppler effects in light waves The Doppler effect in...
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Doppler effect
Book article from: The Columbia Encyclopedia, Sixth Edition
Doppler effect change in the wavelength...Austrian scientist Christian Doppler, who demonstrated the effect...other galaxies. The Doppler effect is responsible for the red...galaxy is rotating. The Doppler shift in radar pulses reflected...
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doppler effect
Book article from: The Oxford Essential Dictionary of the U.S. Military
doppler effect the phenomenon evidenced by the change in the observed frequency of a sound or radio wave caused by a time rate of change in the effective length of the path of travel between the source and the point of observation.
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Doppler, Johann Christian
Dictionary entry from: Complete Dictionary of Scientific Biography
...to have their origin in the Doppler effect. It should be noted that Doppler worked under rather isolated...Huggins in 1868. The optical effect was first confirmed terrestrially...by relativity theory, the Doppler principle has become a major...
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Doppler Ultrasonography
Encyclopedia entry from: Gale Encyclopedia of Medicine, 3rd ed.
...blood flow more clearly. During a Doppler ultrasonography procedure the technician...is necessary. Normal results A Doppler ultrasonography test showing no...Livingstone, 1996. KEY TERMS Doppler effect — The principle that...
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