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    This study developed an optical setup for high-speed imaging of automotive fuel sprays. The system significantly reduces optical distortions, improving measurement accuracy in harsh conditions.

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    Area of Science:

    • Optical Engineering
    • Combustion Science
    • Fluid Dynamics

    Background:

    • Harsh optical environments, such as those found in automotive fuel spray analysis, present significant challenges for accurate measurements.
    • Refractive index gradients can cause beam steering, leading to signal attenuation and reduced image quality in high-temporal resolution imaging.

    Purpose of the Study:

    • To develop and validate an optical setup for quantitative, high-temporal resolution line-of-sight extinction imaging.
    • To mitigate the effects of beam steering in challenging environments like automotive fuel sprays.
    • To improve measurement contrast and reduce uncertainty in spray characterization.

    Main Methods:

    • Optimization of illumination and collection optics to minimize beam steering.
    • Utilizing a customized engineered diffuser for maximized radiant intensity and beam-steering suppression.
    • Theoretical analysis supported by ray tracing to establish optimal lighting characteristics.
    • Detailed characterization of the optical system's performance.

    Main Results:

    • The developed optical setup effectively suppresses beam steering, reducing attenuation by an order of magnitude compared to prior systems.
    • High-temporal resolution imaging capabilities were achieved, enabling short exposure times.
    • Demonstrated improved contrast and reduced uncertainty in measurements of liquid-vapor boundaries and soot volume fraction.

    Conclusions:

    • The novel optical setup provides a robust solution for quantitative imaging of fuel sprays under extreme conditions.
    • The design advancements enable more accurate and reliable characterization of combustion processes.
    • This technology has significant implications for automotive engine development and combustion research.