Fiber thermometer based on the cross detection of the fluorescence lifetime of Cr3+:YAG crystal fiber and Plank’s blackbody radiation from cryogenic up to 1400&#8451;

Linhua Ye; Yanqing Qiu; Yonghang Shen; Sailing He

doi:10.1117/12.573935

14 February 2005 Fiber thermometer based on the cross detection of the fluorescence lifetime of Cr3+:YAG crystal fiber and Plank’s blackbody radiation from cryogenic up to 1400°C

Linhua Ye, Yanqing Qiu, Yonghang Shen, Sailing He

Author Affiliations +

Proceedings Volume 5634, Advanced Sensor Systems and Applications II; (2005) https://doi.org/10.1117/12.573935
Event: Photonics Asia, 2004, Beijing, China

Abstract

A fiber thermometer using the cross detection of the fluorescence lifetime and blackbody radiation was presented to measure temperature from -10°C up to 1400°C. Using a long pure YAG crystal fiber as the seed and a 0.1 at. % Cr₂O₃-doped Y₃Al₅O₁₂ sintered powder rod as the source rod, a YAG fiber thermal probe with Cr³⁺ -ions doped end was grown by laser heated pedestal growth method. A blackbody cavity was constructed by sintered a thin ceramic layer around the Cr³⁺: YAG fiber end. A phase-locked detection scheme was used for the fluorescence lifetime detection. The fluorescence characteristics of the Cr³⁺-ions doped YAG was analyzed in a temperature range from -10°C up to 500°C. From 350°C to 1400°C the blackbody radiation signal in a narrow waveband were detected. Because the fluorescence lifetime was intensity independent, it should have the long-term stability and would not change if the fiber connectors of the probes were realigned. So the fluorescence lifetime based temperature measurement could be used to recalibrate that based on the blackbody radiation detection. Preliminary experimental results showed that the system could achieve a resolution much better than 1°C over the whole temperature range from -10°C to 1400°C.

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Linhua Ye, Yanqing Qiu, Yonghang Shen, and Sailing He "Fiber thermometer based on the cross detection of the fluorescence lifetime of Cr3+:YAG crystal fiber and Plank’s blackbody radiation from cryogenic up to 1400°C", Proc. SPIE 5634, Advanced Sensor Systems and Applications II, (14 February 2005); https://doi.org/10.1117/12.573935

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KEYWORDS

Luminescence

YAG lasers

Chromium

Temperature metrology

Black bodies

Crystals

Fluorescence spectroscopy

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