Gas compositional and pressure effects on thermographic phosphor thermometry
Gas compositional and pressure effects on thermographic phosphor thermometry
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DOI：
10.1088/0957-0233/18/3/028
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发表时间：
2007-03
影响因子：
2.4
通讯作者：
J. Brübach;A. Dreizler;J. Janicka
中科院分区：
文献类型：
--
作者：
J. Brübach;A. Dreizler;J. Janicka
在本研究中，气体成分和压力条件对磷光体温度测量的影响进行了研究。建立了一个可加热、加压、光学可及的校准室，用于测量不同温度、分压和绝对压下的磷光衰减时间。在室温下，绝对压力可以增加到30巴。为了改变气体成分，使用氮气、氧气、二氧化碳、甲烷、氦气以及水蒸气。研究了三种不同的磷光体：Mg_4FGeO_6：Mn、La_2O_2S：Eu和Y_2O_3：Eu。磷光激发的第三和第四谐波的脉冲Nd：YAG激光（355 nm和266 nm，分别）和记录时间分辨的光电倍增管。Mg4FGeO6：Mn和La2O2S：Eu的分压和绝对压变化不大。相比之下，Y2O3：Eu表现出对周围气相中氧浓度的强烈敏感性，以及在绝对压力增加后磷光衰减时间的不可逆变化。
In the present study, the influence of gas compositional and pressure conditions on thermographic phosphor thermometry was investigated. A heatable pressurized and optical accessible calibration chamber was built to measure the phosphorescence decay time at different temperatures as well as at different partial and absolute pressures. At room temperature, the absolute pressure could be increased to 30 bar. To vary the gas composition, nitrogen, oxygen, carbon dioxide, methane, helium as well as water vapour were used. Three different phosphors were investigated: Mg4FGeO6:Mn, La2O2S:Eu and Y2O3:Eu. Phosphorescence was excited by the third and the fourth harmonics of a pulsed Nd:YAG-laser (355 nm and 266 nm, respectively) and recorded temporally resolved by a photomultiplier. Mg4FGeO6:Mn as well as La2O2S:Eu were not influenced significantly by varying partial and absolute pressures. In contrast, Y2O3:Eu showed a strong sensitivity on the oxygen concentration of the surrounding gas phase as well as irreversible changes in the phosphorescence decay time after increasing the absolute pressure.