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Related Concept Videos

Doppler Effect - II01:05

Doppler Effect - II

The Doppler effect has several practical, real-world applications. For instance, meteorologists use Doppler radars to interpret weather events based on the Doppler effect. Typically, a transmitter emits radio waves at a specific frequency toward the sky from a weather station. The radio waves bounce off the clouds and precipitation and travel back to the weather station. The radio frequency of the waves reflected back to the station appears to decrease if the clouds or precipitation are moving...
Doppler Effect - I00:56

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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...
Assessing Blood pressure using a doppler ultrasound01:19

Assessing Blood pressure using a doppler ultrasound

To obtain accurate blood pressure measurements in clinical settings, especially when traditional methods are insufficient, healthcare professionals utilize the Doppler ultrasound technique. This method uses high-frequency sound waves to detect blood flow within the arteries, which is crucial for patients with conditions that complicate circulatory system assessment.
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Equipments Used To Measure Blood Pressure01:30

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Related Experiment Video

Updated: Jun 8, 2026

Blood Flow Imaging with Ultrafast Doppler
05:57

Blood Flow Imaging with Ultrafast Doppler

Published on: October 14, 2020

Edge technique for high-accuracy Doppler velocimetry.

B M Gentry, C L Korb

    Applied Optics
    |October 12, 2010
    PubMed
    Summary
    This summary is machine-generated.

    The edge technique achieves precise velocity measurements with minimal error. This method demonstrates high Doppler-shift accuracy, overcoming frequency drifts for reliable scientific data.

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    Blood Flow Imaging with Ultrafast Doppler
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    Published on: October 14, 2020

    High-speed Particle Image Velocimetry Near Surfaces
    11:59

    High-speed Particle Image Velocimetry Near Surfaces

    Published on: June 24, 2013

    Area of Science:

    • Physics
    • Optical Metrology

    Background:

    • Accurate velocity measurements are crucial in various scientific fields.
    • Doppler shift measurements are sensitive to frequency drifts and noise.
    • Existing techniques face challenges in achieving high precision under noisy conditions.

    Purpose of the Study:

    • To demonstrate the efficacy of the edge technique for high-accuracy velocity measurements.
    • To quantify the measurement error and Doppler-shift accuracy achievable with the edge technique.
    • To assess the technique's robustness against frequency drifts.

    Main Methods:

    • Utilizing an edge filter with a spectral width significantly larger than the target accuracy.
    • Performing differential frequency measurements to eliminate short-term frequency drifts.
    • Employing servo locking to compensate for long-term frequency drifts.
    • Conducting measurements across a dynamic range of fringe half-widths.

    Main Results:

    • Achieved experimental error (standard deviation) as low as 12 cm/s for velocity measurements.
    • Demonstrated Doppler-shift measurement accuracy of 8 parts in 10(10) of the laser frequency.
    • Successfully eliminated frequency drifts equivalent to 5 to 10 m/s.
    • Obtained high accuracy over a dynamic range exceeding 500 times the measurement accuracy.

    Conclusions:

    • The edge technique provides a robust and highly accurate method for velocity measurement.
    • The technique effectively mitigates challenges posed by frequency drifts in Doppler shift applications.
    • The demonstrated accuracy and dynamic range position the edge technique for advanced scientific applications.