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Multi-point line focused laser differential interferometer for high-speed flow fluctuation measurements.

Joshua M Weisberger, Brett F Bathel, Gregory C Herring

    Applied Optics
    |December 28, 2020
    PubMed
    Summary

    A novel multi-point focused laser differential interferometer (FLDI) measures density fluctuations at 16 points. This advanced instrument enables simultaneous, multi-line density measurements for detailed flow analysis.

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    Area of Science:

    • Fluid dynamics
    • Optical metrology
    • Laser diagnostics

    Background:

    • Accurate measurement of density fluctuations is crucial for understanding complex fluid phenomena.
    • Conventional single-point interferometers lack the spatial resolution for detailed flow field analysis.
    • Developing advanced diagnostic tools is essential for high-fidelity fluid flow research.

    Purpose of the Study:

    • To develop and demonstrate a multi-point focused laser differential interferometer (FLDI) for high-resolution density fluctuation measurements.
    • To enable simultaneous density measurements along two distinct, configurable lines.
    • To validate the instrument's performance in dynamic flow environments.

    Main Methods:

    • Modification of a single-point FLDI with cylindrical lenses to create two parallel, orthogonally polarized laser lines.
    • Utilizing a 16-element photodiode array for signal detection and density fluctuation measurement.
    • Incorporating a Nomarski prism and a second photodiode array for simultaneous dual-line measurements.
    • Orienting measurement lines at any azimuthal angle in the focal plane.

    Main Results:

    • Successfully measured density fluctuations at 16 points along a line.
    • Demonstrated simultaneous density measurements along two separated lines.
    • Captured density disturbances and velocity of a laser-induced shock wave, validated with schlieren imaging.
    • Acquired density disturbance data in the boundary layer of a flat plate in Mach 6 flow.

    Conclusions:

    • The multi-point FLDI is a capable tool for detailed, multi-point density fluctuation measurements.
    • The instrument provides valuable data for analyzing transient phenomena like shock waves and boundary layer dynamics.
    • This technology advances optical diagnostic capabilities in fluid mechanics research.