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    • Wall Temperature Measurement with Flame Impingement via Laser-Induced Phosphorescence
    DOI：10.13949/j.cnki.nrjgc.2021.06.004
    Key Words:phosphor thermometry  wall temperature  flame impingement  excitation fluence  coating thickness
    Author NameAffiliation
    XUE Xuefeng, LI Tie, WANG Ning, CHEN Run, ZHANG Xiaoqing 1.State Key Laboratory of Ocean Engineering， Shanghai Jiao Tong University， Shanghai 201100, China
    2.Institute of Power Plants and Automation, Shanghai Jiao Tong University， Shanghai 201100, China 
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    Abstract:The high-speed temperature measurement system of laser-induced phosphorescence(LIP) lifetime method was established by using the phosphor of Magnesium fluorogermanate doped with tetravalent manganese ions( Mg28Ge7.5O38F10：Mn4+,MFG：Mn4+). The effects of excitation fluence and phosphor coating thickness on the temperature measurement were investigated. Also, the 1D wall temperature distribution was acquired by the LIP measurement of the premixed butane impinging flame. And the comparison of LIP temperature measurement and thin-film thermocouple was conducted, which verifies the feasibility of the LIP method. The results show when the temperature is lower than 265.3℃, the excitation fluence within 0~1.02mJ/cm2 has no significant impact on the temperature measurement results. When the temperature is higher than 265.3℃, the phosphorescence lifetime is extended as the excitation fluence increases, and reaches the saturation at 1.02mJ/cm2. The phosphor coating thickness has little effect on the LIP temperature measurement. In general, the LIP method favors a good quantitative measurement closer to the truth temperature and a higher sensitivity to spatial fluctuation compared with the thin-film thermocouple.
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