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首页> 外文期刊>Applied optics >Characterization of tracers for two-color laser-induced fluorescence thermometry of liquid-phase temperature in ethanol, 2-ethylhexanoic-acid/ethanol mixtures, 1-butanol, and o-xylene
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Characterization of tracers for two-color laser-induced fluorescence thermometry of liquid-phase temperature in ethanol, 2-ethylhexanoic-acid/ethanol mixtures, 1-butanol, and o-xylene

机译：乙醇，2-乙基己酸/乙醇混合物，1-丁醇和O-二甲苯的液相温度液相温度的示踪剂特征

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摘要

The fluorescence spectra of dye solutions change their spectral signature with temperature. This effect is frequently used for temperature imaging in liquids and sprays based on two-color laser-induced fluorescence (2cLIF) measurements by simultaneously detecting the fluorescence intensity in two separate wavelength channels resulting in a temperature-sensitive ratio. In this work, we recorded temperature-dependent absorption and fluorescence spectra of solutions of five laser dyes (coumarin 152, coumarin 153, rhodamine B, pyrromethene 597, and DCM) dissolved in ethanol, a 35/65 vol.% mixture of ethanol/2-ethylhexanoic acid, ethanol/hexamethylsiloxane, oxylene, and 1-butanol to investigate their potential as temperature tracers in evaporating and burning sprays. The dissolved tracers were excited at either 266, 355, and 532 nm (depending on the tracer) for temperatures between 296 and 393 K (depending on the solvent) and for concentrations ranging between 0.1 and 10 mg/l. Absorption and fluorescence spectra of the tracers were investigated for their temperature dependence, the magnitude of signal re-absorption, the impact of different solvents, and varying two-component solvent compositions. Based on the measured fluorescence spectra, the tracers were analyzed for their 2cLIF temperature sensitivity in the respective solvents. Coumarin 152 showed for single-component solvents the overall best spectroscopic properties for our specific measurement situation related to temperature imaging measurements in spray-flame synthesis of nanoparticles as demonstrated previously in ethanol spray flames. (C) 2021 Optical Society of America
机译：染料溶液的荧光光谱随温度的变化而变化。这种效应通常用于液体和喷雾中的温度成像，基于双色激光诱导荧光（2cLIF）测量，通过同时检测两个单独波长通道中的荧光强度，产生温度敏感比。在这项工作中，我们记录了五种激光染料（香豆素152、香豆素153、罗丹明B、吡咯烷597和DCM）溶解在乙醇、乙醇/2-乙基己酸、乙醇/六甲基硅氧烷、氧基乙烯和乙醇的35/65体积%混合物中的溶液的温度依赖性吸收光谱和荧光光谱，和1-丁醇，以研究它们作为蒸发和燃烧喷雾温度示踪剂的潜力。溶解的示踪剂在266、355和532 nm（取决于示踪剂）下激发，温度在296和393 K（取决于溶剂）之间，浓度在0.1和10 mg/l之间。研究了示踪剂的吸收光谱和荧光光谱的温度依赖性、信号再吸收的幅度、不同溶剂的影响，以及不同的双组分溶剂组成。根据测量的荧光光谱，分析了示踪剂在各自溶剂中的2cLIF温度灵敏度。香豆素152表明，对于单组分溶剂，我们在喷雾火焰合成纳米颗粒的温度成像测量方面的具体测量情况总体上具有最好的光谱性质，正如之前在乙醇喷雾火焰中所证明的那样。（2021）美国光学学会

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