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Simultaneous, multipoint single-shot coherent Rayleigh--Brillouin scattering.

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    A new laser diagnostic method allows simultaneous, localized velocity measurements at the micrometer scale using coherent Rayleigh-Brillouin scattering (CRBS). This technique is scalable for advanced flow characterization in complex environments.

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    Area of Science:

    • Physics
    • Fluid Dynamics
    • Optical Diagnostics

    Background:

    • Accurate flow characterization is crucial for understanding complex physical phenomena.
    • Existing diagnostic techniques often lack spatial resolution or simultaneous multi-point measurement capabilities.

    Purpose of the Study:

    • To introduce a novel laser diagnostic technique for simultaneous velocity measurements at multiple spatial locations.
    • To enable localized flow diagnostics at the micrometer scale.

    Main Methods:

    • Utilized single-shot coherent Rayleigh-Brillouin scattering (CRBS).
    • Employed spatial splitting of the signal beam to probe distinct regions independently and simultaneously.
    • Performed measurements in an under-expanded jet with sharp velocity gradients and microscale flow structures.

    Main Results:

    • Demonstrated simultaneous, localized velocity measurements at the micrometer scale.
    • Extracted velocity components from spectroscopic signatures, revealing flow-dependent characteristics.
    • Successfully probed microscale flow structures and sharp radial velocity gradients.

    Conclusions:

    • The presented CRBS technique offers a powerful and flexible tool for detailed thermodynamic characterization of neutral gas and plasma flows.
    • The method is inherently scalable, allowing for optical design modifications to suit complex environments.
    • This advancement facilitates high-resolution analysis of flow dynamics in intricate systems.