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Experimental Investigation of the Flow Structure over a Delta Wing Via Flow Visualization Methods
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Published on: April 23, 2018

Directional laser Doppler velocimeter.

O Lanz, C C Johnson, S Morikawa

    Applied Optics
    |January 23, 2010
    PubMed
    Summary
    This summary is machine-generated.

    A new directional laser Doppler velocimeter provides localized fluid flow measurements. This instrument accurately detects flow velocity direction and magnitude using scattered light and frequency shifting.

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    Area of Science:

    • Fluid dynamics
    • Optical measurement techniques
    • Laser Doppler velocimetry

    Background:

    • Accurate measurement of fluid flow velocity is crucial in many scientific and engineering fields.
    • Traditional velocimetry methods may lack directional sensitivity or localized measurement capabilities.

    Purpose of the Study:

    • To describe a novel directional laser Doppler velocimeter (LDV) for localized fluid flow measurements.
    • To demonstrate its capability in measuring both steady and time-varying flow velocities.

    Main Methods:

    • Utilizing Doppler-shifted radiation scattered from particles within the fluid.
    • Employing heterodyning of the scattered signal with a frequency-shifted reference beam.
    • Achieving directional sensitivity via an acoustical diffraction cell for reference beam frequency shifting.

    Main Results:

    • The frequency shift of the scattered light is directly proportional to the fluid scatterer's velocity.
    • Successful measurements of steady and time-varying flow velocities were performed.
    • The system demonstrated localized directional measurement capabilities in a perturbed circular flow section.

    Conclusions:

    • The developed directional laser Doppler velocimeter is effective for localized fluid flow analysis.
    • The use of an acoustical diffraction cell provides reliable directional sensitivity.
    • This technique offers a valuable tool for studying complex fluid dynamics.