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Depth-Penetrating Temperature Measurements of Thermal Barrier Coatings Incorporating Thermographic Phosphors

机译：结合热敏荧光粉的热障涂层的穿透深度温度测量

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摘要

Thermographic phosphors have been previously demonstrated to provide effective non-contact, emissivity-independent surface temperature measurements. Because of the translucent nature of thermal barrier coatings (TBCs), thermographic phosphor-based temperature measurements can be extended beyond the surface to provide depth-selective temperature measurements by incorporating the thermographic phosphor layer at the depth where the temperature measurement is desired. In this paper, thermographic phosphor (Y2O3:Eu) fluorescence decay time measurements are demonstrated to provide through-the-coating thickness temperature readings up to 1100 C with the phosphor layer residing beneath a 100 micron thick TBC (plasma-sprayed 8wt% yttria-stabilized zirconia). With an appropriately chosen excitation wavelength and detection configuration, it is shown that sufficient phosphor emission is generated to provide effective temperature measurements, despite the attenuation of both the excitation and emission intensities by the overlying TBC. This depth-penetrating temperature measurement capability should prove particularly useful for TBC diagnostics where a large thermal gradient is typically present across the TBC thickness. The fluorescence decay from the Y2O3:Eu layer exhibited both an initial short-term exponential rise and a longer-term exponential decay. The rise time constant was demonstrated to provide better temperature indication below 500 C while the decay time constant was a better indicator at higher temperatures.
机译：先前已证明，热成像磷光体可提供有效的非接触，与发射率无关的表面温度测量。由于热障涂层（TBC）的半透明特性，可以通过在需要进行温度测量的深度处合并热成像荧光粉层，将基于热成像荧光粉的温度测量范围扩展到表面之外，从而提供深度选择温度测量。本文证明了热成像磷光体（Y2O3：Eu）荧光衰减时间的测量可提供高达1100 C的整个涂层厚度温度读数，并且磷光体层位于100微米厚的TBC（等离子喷涂的8wt％氧化钇-稳定的氧化锆）。通过适当选择的激发波长和检测配置，可以看出，尽管上覆的TBC减弱了激发强度和发射强度，但仍产生了足够的磷光体发射以提供有效的温度测量值。这种穿透深度的温度测量功能对于TBC诊断尤其有用，在TBC诊断中，通常在整个TBC厚度上会出现较大的热梯度。 Y2O3：Eu层的荧光衰减表现出初始的短期指数上升和长期的指数衰减。事实证明，上升时间常数可在500°C以下提供更好的温度指示，而衰减时间常数则是在较高温度下的较好指示。

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