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    This study introduces a digital holographic interferometer for visualizing flame flow dynamics. The technique captures flow intensity and phase changes, offering a pseudo-3D view and multiple gradient maps simultaneously, validated against traditional schlieren methods and thermocouple measurements.

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    Area of Science:

    • Optical Physics
    • Fluid Dynamics
    • Combustion Science

    Background:

    • Classical schlieren techniques visualize fluid density gradients but are limited in simultaneous gradient capture.
    • Digital holographic interferometry offers advanced phase retrieval capabilities for flow analysis.
    • Flame visualization requires non-intrusive methods to avoid disturbing the flow dynamics.

    Purpose of the Study:

    • To present a digital holographic interferometer for indirect visualization of diffusion flame flow.
    • To demonstrate the system's ability to capture both intensity and phase information simultaneously.
    • To validate the retrieved flow data against established optical and thermal measurement techniques.

    Main Methods:

    • Utilized a collimated beam in transmission mode to illuminate the diffusion flame.
    • Employed digital holographic interferometry to record intensity and phase changes.
    • Compared results with a Z-type schlieren setup and validated temperature profiles with thermocouple measurements.

    Main Results:

    • The interferometer successfully visualized flame flow, avoiding sensor saturation via indirect illumination.
    • Retrieved pseudo-3D flow views and multiple gradient maps from a single hologram.
    • Obtained and validated temperature profiles using the optical phase data, showing good agreement with thermocouple measurements.

    Conclusions:

    • The digital holographic interferometer provides a comprehensive, simultaneous visualization of flame flow characteristics.
    • This method overcomes limitations of classical schlieren by capturing multiple gradients at once.
    • The technique shows potential for accurate thermal profile reconstruction in combustion studies.