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    High-repetition-rate Krypton planar laser-induced fluorescence (Kr PLIF) was achieved at 100 kHz. This advancement enables faster flow structure and mixture fraction tracking for high-speed applications.

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    Area of Science:

    • Fluid Dynamics
    • Laser Spectroscopy
    • Optical Diagnostics

    Background:

    • Planar laser-induced fluorescence (PLIF) is a key diagnostic technique.
    • Previous Kr PLIF methods were limited by lower repetition rates.
    • High-speed flow analysis requires advanced, time-resolved diagnostic capabilities.

    Purpose of the Study:

    • To demonstrate Krypton planar laser-induced fluorescence (Kr PLIF) at a significantly increased repetition rate.
    • To enable time-resolved measurements of flow structures and mixture fraction.
    • To advance laser-based diagnostic tools for high-speed fluid dynamics.

    Main Methods:

    • Developed a custom injection-seeded optical parametric oscillator.
    • Converted 355 nm laser output to 212.56 nm for Kr excitation.
    • Utilized a high-repetition-rate nanosecond burst-mode laser system.

    Main Results:

    • Achieved Kr PLIF at a repetition rate of 100 kHz.
    • Demonstrated successful tracking of flow structures and mixture fraction.
    • Obtained detection speeds 100 times faster than previous femtosecond laser sources.

    Conclusions:

    • The 100 kHz Kr PLIF technique is suitable for time-resolved measurements.
    • This advancement significantly enhances the applicability of Kr PLIF for high-speed flow studies.
    • The developed system provides a powerful new tool for fluid dynamics research.