Doppler effect
   Also known as Doppler shift. Both eponyms refer to the Austrian mathematician and physicist Christian Andreas Doppler (1803-1853), who first described the effect in or shortly before 1842. In perceptual neuroscience, they are used to denote an * auditory illusion consisting of a change in frequency of a sound, as perceived by an observer moving relative to the source of the sound. In everyday life the Doppler effect is experienced when a motor vehicle approaches an observer, and then passes and recedes. As compared to the emitted frequency of the sound, the perceived frequency is increased during the approach, identical at the instant of passing by, and decreased during the recession. Doppler's original description had a bearing on the light waves emitted by binary stars. The application of his discovery to sound waves was published in 1845 by the Dutch chemist and meteorologist Christophorus Henricus Diedericus Buys Ballot (1817-1890).
   References
   Doppler, C.A.D. (1842). Über das farbige Licht der Doppelsterne und einiger anderer Gestirne des Himmels. Versuch einer das Bradley'sche Aberrations-Theorem als integrirenden Theil in sich schliessenden allgemeineren Theorie.Prag: Verlag der Königl. Böhm, Gesellschaft der Wissenschaften.
   Jonkman, E.J. (1980). Doppler research in the nineteenth century. Ultrasound in Medicine & Biology, 6, 1-5.

Dictionary of Hallucinations. . 2010.

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  • Doppler effect — Doppler io reiškinys statusas T sritis automatika atitikmenys: angl. Doppler effect vok. Doppler Effekt, m rus. доплеровский эффект, m pranc. effet Doppler, m ryšiai: sinonimas – Doplerio reiškinys …   Automatikos terminų žodynas

  • Doppler effect — (also Doppler shift) ► NOUN Physics ▪ an increase (or decrease) in the apparent frequency of sound, light, or other waves as the source and the observer move towards (or away from) each other. ORIGIN named after the Austrian physicist Johann… …   English terms dictionary

  • Doppler effect — [däp′lər] n. [after C. Doppler (1803 53), Austrian mathematician and physicist] the apparent change of frequency of sound waves or light waves, varying with the relative velocity of the source and the observer: if the source and observer are… …   English World dictionary

  • Doppler effect — n a change in the frequency with which waves (as sound, light, or radio waves) from a given source reach an observer when the source and the observer are in motion with respect to each other so that the frequency increases or decreases according… …   Medical dictionary

  • Doppler effect — Change of wavelength caused by motion of the source. An animation illustrating how the Doppler effect causes a car engine or siren to soun …   Wikipedia

  • Doppler effect — /dop leuhr/, Physics. (often l.c.) the shift in frequency (Doppler shift) of acoustic or electromagnetic radiation emitted by a source moving relative to an observer as perceived by the observer: the shift is to higher frequencies when the source …   Universalium

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