Referencing of Fluorescence Thermometry with Blackbody Radiation Pyrometry

Cross-Referencing of Fluorescence Thermometry with Blackbody Radiation Pyrometry 

Some rare-earth-activated materials do show strong fluorescence phenomena at temperatures even up to IOOO°C with a lifetime long enough to be detected without particular difficulties, as demonstrated in the cases of neodymium yttrium-aluminum-garnet(Nd YAG) andScPC 4 Eu3+ by Grattan etal.m and Bugos etal.,m respectively. 

In summary, the use of fluorescence lifetime monitoring for temperature sensing at high temperatures is based on the phenomenon of thermal quenching of fluorescence, while this phenomenon is j u st the very obstacle that blocks the extending of the measurement further into higher temperatures. Therefore, fluorescence thermometry is intrinsically more effective for measurement within moderate temperature regions, due to this fundamental nature of the fluorescence emission itself. 

Nd YAG and the lifetime measurement is made by the use of the phase-locked detection of fluorescence lifetime (PLD) scheme. By reference to the use of the fluorescence lifetime measurement, the problems, in pyrometry, of emissivity, and sight path factor in the blackbody radiation measurement could be corrected in such a scheme having an internal self-calibration.  

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