Abstract
In this article, we compare absorption and temperature-dependent fluorescence spectra of five organic dyes for 2c-LIF (two-color laser-induced fluorescence) thermometry in ethanol and butanol. The dyes fluorescein, eosin Y, rhodamine B, rhodamine 6G, and sulforhodamine 101 individually mixed in ethanol and butanol were studied at liquid temperatures of 25–65 °C. The self-absorption spectral bands are analyzed along with intensity ratios and the respective sensitivities for one-dye and two-dye 2c-LIF thermometry are deduced. For one-dye 2c-LIF, rhodamine B showed the highest sensitivity of 2.93%/°C and 2.89%/°C in ethanol and butanol, respectively. Sulforhodamine 101 and rhodamine 6G showed the least sensitivities of 0.51%/°C and 1.24%/°C in ethanol and butanol, respectively. For two-dye 2c-LIF, rhodamine B/sulforhodamine 101 exhibited the highest temperature sensitivities of 2.39%/°C and 2.54%/°C in ethanol and butanol, respectively. The dye pair eosin Y/sulforhodamine 101 showed the least sensitivities of 0.15%/°C and 0.27%/°C in ethanol and butanol, respectively.
Highlights
IntroductionOrganic dyes such as rhodamines, fluoresceins, and eosins have been applied as LIF (laser-induced fluorescence) tracers for the characterization of liquids and/or two-phase flows [1]
Organic dyes such as rhodamines, fluoresceins, and eosins have been applied as LIF tracers for the characterization of liquids and/or two-phase flows [1]
We investigate temperature-dependent LIF emission spectra of five organic fluorescent tracers—fluorescein (FL), eosin Y (EY), rhodamine B (RhB), rhodamine 6G (Rh6G), and sulforhodamine 101 (SRh101)—in pure ethanol and butanol
Summary
Organic dyes such as rhodamines, fluoresceins, and eosins have been applied as LIF (laser-induced fluorescence) tracers for the characterization of liquids and/or two-phase flows [1]. These substances are readily available as chemicals with high solubility in the liquids under investigation [1]. These dyes show high fluorescence quantum yield [2,3] and usually strong absorption cross-section depending on the selected excitation wavelength of the light source [3].
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