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Science 28 November 2003:
Vol. 302. no. 5650, pp. 1537 - 1540
DOI: 10.1126/science.1089342
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Reports

Observation of the Inverse Doppler Effect

N. Seddon* and T. Bearpark

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.

Optics and Laser Technology Department, Advanced Technology Centre, BAE Systems, Post Office Box 5, Filton, Bristol BS34 7QW, UK.

* To whom correspondence should be addressed. E-mail: nigel.seddon{at}baesystems.com

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Science. ISSN 0036-8075 (print), 1095-9203 (online)