Abstract The Ce,Pr:LuAG phosphor is investigated for use in co-doped aerosol phosphor thermometry (APT). The phosphor was characterized by measuring the emission intensity for each ion as a function of excitation laser fluence and temperature. A simplified three-level model was used to interpret and fit the data. The phosphor was then used for co-doped APT temperature-imaging experiments performed in a heated air jet up to a maximum temperature of 694 K. The three-level model fit was used to analyze sources of bias in the imaging measurements. Both ions’ emission intensities show a nonlinear dependence on excitation fluence that can potentially be explained by temperature-dependent ground- and excited-state absorption processes included in the three-level model. Single-shot temperature precision from the temperature-imaging experiments was measured to be 22, 23, and 32 K for mean temperatures of 497, 603, and 694 K, respectively, at a spatial resolution of ∼ 1.12 lp/mm and average fluence of 33 mJ/cm2. The results extend the measurement range for co-doped APT to at least 700 K. The findings also provide a simple model for phosphor signal non-linearity with excitation fluence for low activator ion concentrations, and provide a method for estimating temperature bias from several sources including laser fluence.

中文翻译：

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用于共掺杂气溶胶荧光粉测温的 Ce,Pr:LuAG 荧光粉的表征

摘要 研究了 Ce,Pr:LuAG 磷光体在共掺杂气溶胶磷光体测温 (APT) 中的应用。通过测量作为激发激光能量密度和温度函数的每个离子的发射强度来表征磷光体。使用简化的三级模型来解释和拟合数据。然后将磷光体用于在最高温度为 694 K 的热空气喷射中进行的共掺杂 APT 温度成像实验。三级模型拟合用于分析成像测量中的偏差源。两种离子的发射强度都表现出对激发注量的非线性依赖性，这可能可以通过三能级模型中包含的温度相关基态和激发态吸收过程来解释。温度成像实验的单次温度精度分别为 22、23 和 32 K，平均温度分别为 497、603 和 694 K，空间分辨率约为 1.12 lp/mm，平均通量为33 兆焦耳/平方厘米。结果将共掺杂 APT 的测量范围扩展到至少 700 K。这些发现还提供了一个简单的荧光信号非线性模型，在低活化剂离子浓度下具有激发通量，并提供了一种估计来自多个来源的温度偏差的方法包括激光能量密度。