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Quantum Numbers02:43

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    Area of Science:

    • Physical Chemistry
    • Chemical Engineering
    • Laser Spectroscopy

    Background:

    • Accurate temperature measurements are crucial for understanding combustion and energetic materials.
    • Previous methods faced challenges with emissions and beam steering in high-temperature environments.

    Purpose of the Study:

    • To develop and validate a time-resolved temperature measurement technique for shock-heated gases.
    • To assess the suitability of this technique for studying energetic materials.

    Main Methods:

    • Utilized a single acousto-optically modulated quantum cascade laser (QCL) with mid-infrared output.
    • Performed time-resolved temperature measurements in shock-heated carbon monoxide mixtures (1000-1800 K).
    • Investigated two pressure ranges (2.0-2.9 atm and 7.6-10.7 atm) at high data acquisition rates (up to 250 kHz).

    Main Results:

    • Achieved excellent agreement between measured temperatures and ideal shock relations.
    • Demonstrated that temperature profiles after shock waves are well-modeled by isentropic compression.
    • The diagnostic system showed immunity to emissions and beam steering.

    Conclusions:

    • The developed QCL-based system provides accurate, time-resolved temperature measurements in challenging shock-heated environments.
    • This robust diagnostic is well-suited for studying high-temperature gas-phase reactions of energetic materials like RDX and HMX.