doppler effect/shift/principle/phenomenon

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The apparent change in the frequency of sound or electromagnetic radiation due to relative motion between the source & the observer.


  • Of diagnostic value in cardiology & obstetrics
  • used in radar:
    • to distinguish between stationary & moving targets
    • to provide information concerning their velocity, by measuring the frequency shift between the emitted & the reflected radiation

[from Johann Christian Doppler, Austrian mathematicican & physicist]

More general terms

Additional terms


  1. Stedman's Medical Dictionary 27th ed, Williams & Wilkins, Baltimore, 1999.
  2. Clinically Oriented Anatomy, 4th edition, KL Moore & AF Dalley (eds), Lippincott Williams & Wilkins, Philadelphia, PA 1999.