Phosphorescent thermal history sensors
Phosphorescent thermal history sensors
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DOI：
10.1016/j.sna.2011.04.022
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发表时间：
2011-09-10
影响因子：
4.6
通讯作者：
Heyes, A.
中科院分区：
文献类型：
--
作者：
Rabhiou, A.;Feist, J.;Heyes, A.
燃气轮机热段表面的工作温度具有重要的实际意义，但通常很难测量。热指示涂料提供了一种可能的和实用的方法，但它们有许多缺点。Feist等人[1]在2007年提出了利用磷光涂层作为热历史传感器的新概念。当暴露于高温时，这些磷光体涂层经历不可逆的变化，这影响其光致发光特性，并且是暴露的温度和持续时间的函数。如果在暴露过程中注意确保稳态条件，则随后在实验室中对排放进行离线分析可以揭示涂层所经历的温度。在本文中，Y2 SiO 5：Tb的非晶到结晶的变化的调查报告，并用于提供磷光热历史传感器的概念证明。荧光粉在不同温度下煅烧不同时间，并使用光致发光光谱进行表征。生成校准曲线，并且该校准曲线示出该磷光体适合于在从600摄氏度到至少1000摄氏度的温度范围内的温度测量。利用更先进的信号处理例程，可以预期动态范围可以扩展到1400摄氏度。这些常规和其他材料/物理过程是帝国理工学院和Southside Thermal Sciences正在进行的研究的主题。(C)2011 Elsevier B. V.保留所有权利。
The operating temperatures of surfaces in the hot sections of gas turbines are of great practical importance, but are often very hard to measure. Thermal indicating paints offer one possible and practical way, but they have many disadvantages. A novel concept for the utilisation of phosphorescent coatings as thermal history sensors was proposed by Feist et al. [1] in 2007. These phosphor coatings undergo irreversible changes when exposed to high temperatures that affect their photoluminescent properties and are a function of both the temperature and duration of exposure. If care is taken to ensure steady state conditions during exposure, subsequent off-line analysis of emission in the laboratory can reveal the temperature experienced by the coating. In this paper, an investigation of the amorphous-to-crystalline change of Y2SiO5:Tb is reported and used to provide a proof of concept for a phosphorescent thermal history sensor. Phosphor powder was calcined at different temperatures and for different periods, and characterised using photoluminescence spectroscopy. A calibration curve was generated and shows that this phosphor is suitable for temperature measurements over a temperature range from 600 degrees C to at least 1000 degrees C. With more advanced signal processing routines it is anticipated that the dynamic range might be extended to 1400 degrees C. Such routines and other materials/physical processes are the subject of on-going research in the area at Imperial College and Southside Thermal Sciences. (C) 2011 Elsevier B.V. All rights reserved.