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Surface heating measurements with temperature-sensitive paint films using fluorescent lifetime analysis.

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    Temperature-sensitive paint (TSP) measures surface heating using fluorescent signal lifetime analysis. This technique accurately captures rapid temperature changes in shock tube experiments.

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    Area of Science:

    • Materials Science
    • Physical Chemistry
    • Fluid Dynamics

    Background:

    • Surface temperature measurement is critical in dynamic environments.
    • Traditional methods often lack the spatial or temporal resolution required for high-speed events.
    • Fluorescence-based thermometry offers a potential solution for non-contact temperature sensing.

    Purpose of the Study:

    • To develop and validate a temperature-sensitive paint (TSP) method for high-speed surface heating measurements.
    • To utilize fluorescent signal lifetime analysis for accurate temperature mapping.
    • To assess the performance of TSP in a shock tube environment.

    Main Methods:

    • Application of temperature-sensitive paint to an adhesive film.
    • Fluorescent signal lifetime analysis with pulsed excitation.
    • Calibration of fluorescence decay lifetimes to temperature.
    • High-speed temperature measurements in a shock tube at 25 kHz.

    Main Results:

    • A two-level model for TSP fluorescence under pulsed excitation was discussed.
    • Temperature variations in emission decay lifetimes for a ruthenium-based TSP were extracted.
    • Calibration curves enabled accurate temperature mapping.
    • Measurements showed good agreement with lower-rate IR thermography (240 Hz).

    Conclusions:

    • Fluorescent signal lifetime analysis of TSP is a viable technique for high-speed surface temperature measurements.
    • The method provides accurate and high-resolution thermal data in dynamic events like shock tube experiments.
    • TSP offers a significant advancement in real-time thermal monitoring capabilities.