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Related Concept Videos

Blind Procedures02:07

Blind Procedures

Ideally, the people who observe and record the children’s behavior are unaware of who was assigned to the experimental or control group, in order to control for experimenter bias. Experimenter bias refers to the possibility that a researcher’s expectations might skew the results of the study. Remember, conducting an experiment requires a lot of planning, and the people involved in the research project have a vested interest in supporting their hypotheses. If the observers knew which child was...
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Related Experiment Video

Updated: Jul 11, 2026

Methods to Explore the Influence of Top-down Visual Processes on Motor Behavior
09:49

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Published on: April 16, 2014

Observation of the inverse Doppler effect.

N Seddon1, T Bearpark

  • 1Optics and Laser Technology Department, Advanced Technology Centre, BAE Systems, Post Office Box 5, Filton, Bristol BS34 7QW, UK. nigel.seddon@baesystems.com

Science (New York, N.Y.)
|December 4, 2003
PubMed
Summary

Scientists observed an inverse Doppler shift, where wave frequency increases upon reflection from a receding boundary. This novel effect in electrical transmission lines offers potential for advanced radiation sources.

Area of Science:

  • Physics
  • Electrical Engineering
  • Wave Phenomena

Background:

  • The Doppler effect typically describes frequency shifts due to relative motion between a source and observer.
  • Conventional Doppler shifts are limited by kinematic velocities of physical objects.

Purpose of the Study:

  • To experimentally demonstrate and investigate the inverse Doppler shift.
  • To explore the generation of significant Doppler shifts using a controlled electrical system.

Main Methods:

  • Utilizing a moving discontinuity within an electrical transmission line.
  • Reflecting waves from this electronically controlled moving boundary.

Main Results:

  • Observed an inverse Doppler shift, with wave frequency increasing upon reflection from a receding boundary.

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  • Achieved Doppler shifts five orders of magnitude greater than those from conventional kinematic velocities.
  • Demonstrated reproducible control over Doppler shift magnitudes.

    • Conclusions:

    • The inverse Doppler shift is experimentally verifiable in electrical transmission lines.
    • This system provides a novel method for generating tunable and multifrequency radiation.
    • Potential applications in advanced tunable radiation sources are highlighted.