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Deals with a study which presented surface preflashover phenomena across alumina ceramics in vacuum. Experimental setup; Results and discussion.

Fluorescence intensity ratio (FIR) variation of green upconversion emissions at 523 and 545 nm in the Er3+–Yb3+ codoped Al2O3 has been studied as a function of temperature using a 978 nm semiconductor laser diode as an excitation source. In the temperature range of 295–973 K, the maximum sensitivity and the temperature revolution derived from the FIR technique are approximately 0.0051 K-1 and 0.3 K, respectively. The Er3+–Yb3+ codoped Al2O3 material with the highest operating temperature up to 973 K, the higher temperature revolution, and the fluorescence efficiency indicated that it is promising for applications in optical high temperature sensor. [ABSTRACT FROM AUTHOR]

Fluorescence intensity ratio (FIR) variation of green upconversion emissions at 523 and 545 nm in the Er3+–Yb3+ codoped Al2O3 has been studied as a function of temperature using a 978 nm semiconductor laser diode as an excitation source. In the temperature range of 295–973 K, the maximum sensitivity and the temperature revolution derived from the FIR technique are approximately 0.0051 K-1 and 0.3 K, respectively. The Er3+–Yb3+ codoped Al2O3 material with the highest operating temperature up to 973 K, the higher temperature revolution, and the fluorescence efficiency indicated that it is promising for applications in optical high temperature sensor. [ABSTRACT FROM AUTHOR]