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The Doppler effect and Doppler shift were named after the Austrian physicist and mathematician Christian Johann Doppler in 1842, who conducted experiments with both moving sources and moving observers. Consider an observer standing on a street corner, observing an ambulance with a siren sound passing by at a constant speed. The observer experiences two characteristic changes in the sound of the siren. Initially, the sound increases in loudness as the ambulance approaches and decreases in...
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Related Experiment Video

Updated: Jan 19, 2026

Three-dimensional Particle Tracking Velocimetry for Turbulence Applications: Case of a Jet Flow
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Published on: February 27, 2016

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Time-stretched photonic Doppler velocimetry.

J G Mance, B M La Lone, D H Dolan

    Optics Express
    |September 13, 2019
    PubMed
    Summary

    Researchers developed a new velocimetry technique for inertial confinement fusion, enabling precise measurement of high material velocities. This method overcomes detector bandwidth limitations, crucial for understanding implosion dynamics.

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    Last Updated: Jan 19, 2026

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    Blood Flow Imaging with Ultrafast Doppler
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    Area of Science:

    • Plasma Physics
    • High-Energy-Density Science
    • Optical Diagnostics

    Background:

    • Inertial confinement fusion (ICF) facilities achieve implosion speeds exceeding 100 km/s.
    • Accurate measurement of material velocities in ICF is critical but technically challenging.
    • Existing velocimetry techniques are often limited by detector bandwidth, restricting the measurable velocity range.

    Purpose of the Study:

    • To develop and demonstrate a novel velocimetry technique for measuring high material velocities in ICF.
    • To overcome the bandwidth limitations inherent in conventional diagnostic methods.
    • To enhance the precision and range of velocity measurements in dynamic experiments.

    Main Methods:

    • Implementation of time-stretched spectral interferometry for velocimetry.
    • Encoding the velocity signal onto a chirped laser pulse.
    • Temporal stretching of the laser pulse to reduce the beat frequency prior to detection.
    • Experimental validation on an imploding liner experiment at the Sandia National Laboratories' Z machine.

    Main Results:

    • Successfully demonstrated the time-stretched spectral interferometry technique.
    • Measured beat frequencies exceeding 50 GHz.
    • Achieved these measurements using a detector with a 20 GHz bandwidth, significantly extending the measurable range.
    • Validated the technique's effectiveness in a high-speed implosion scenario.

    Conclusions:

    • The developed time-stretched spectral interferometry technique effectively increases the measurable velocity range for diagnostics.
    • This advancement is crucial for accurately characterizing high-velocity phenomena in ICF and related high-energy-density experiments.
    • The technique offers a promising solution for overcoming detector bandwidth limitations in advanced velocimetry.