Observation of the Inverse Doppler Effect

We report experimental observation of an inverse Doppler shift, in which the frequency of a wave is increased on reflection from a receding boundary. This counterintuitive effect has been produced by reflecting a wave from a moving discontinuity in an electrical transmission line. Doppler shifts pro...

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Veröffentlicht in:	Science (American Association for the Advancement of Science) 2003-11, Vol.302 (5650), p.1537-1540
Hauptverfasser:	Seddon, N., Bearpark, T.
Format:	Artikel
Sprache:	eng
Schlagworte:	Doppler effect Edge and boundary effects reflection and refraction Electric power lines Electric waves Electromagnetic radiation Electromagnetic waves Exact sciences and technology Frequencies Fundamental areas of phenomenology (including applications) Kinetics Lasers Observation Observations Optics Phase velocity Physics Pumps Shock discontinuity Signal reflection Transmission lines Velocity Wave dispersion Wave optics Wave reflection Wave velocity
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Beschreibung
Zusammenfassung:	We report experimental observation of an inverse Doppler shift, in which the frequency of a wave is increased on reflection from a receding boundary. This counterintuitive effect has been produced by reflecting a wave from a moving discontinuity in an electrical transmission line. Doppler shifts produced by this system can be varied in a reproducible manner by electronic control of the transmission line and are typically five orders of magnitude greater than those produced by solid objects with kinematic velocities. Potential applications include the development of tunable and multifrequency radiation sources.
ISSN:	0036-8075 1095-9203
DOI:	10.1126/science.1089342