Nonlinear temperature calibration equation for Rhodamine B in different solutions for wide-temperature-range applications

Zhou, Jiang‐Ning; Yang, Wei; Yin, Yimin; Chen, Shuang; Mu, Jinhe; Qi, Xinhua

doi:10.1364/ao.58.001514

Cited by 9 publications

(3 citation statements)

References 23 publications

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“…Coumarin in ethanol shows a large temperature sensitivity, but must be excited in the UV wavelength range, where certain solvents show large absorption cross sections as well [13]. 2c-LIF thermometry using Rhodamine B works well in combination with ethanol and water [18][19][20][21][22]. Fluorescein can be dissolved in water and ethanol [23][24][25].…”

Section: Introductionmentioning

confidence: 99%

A novel laser-induced fluorescence concept for thermometry measurements in machining lubricoolants

Koegl,

Glahn,

Zigan

2024

Meas. Sci. Technol.

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This study investigates a two-colour LIF (laser-induced fluorescence) technique for thermometry in cooling lubricants (CL) for machining. The diagnostic technique should enable a simultaneous determination of cooling film thickness and film temperature, which is relevant for typical machining processes like turning and milling processes. The temperature determination is based on a temperature-sensitive fluorescence intensity ratio of a special dye determined in suitable spectral regions representing common band pass filters. For this purpose, two cooling lubricant emulsions CL6 (6 vol.% CL, 94 vol.% water; normal machining) and CL10 (10 vol.% CL, 90 vol.% water; heavy machining) and its individual components were doped with the fluorescence dye Eosin-Y. Temperature dependent spectral LIF intensities were recorded in the range of 273–313 K, which are relevant for milling and cutting operations. Furthermore, absorption spectra were analysed as well. The temperature-dependent fluorescence measurements revealed a temperature limit for the emulsion stability. The emission peaks of Eosin-Y are shifted with increasing temperature towards longer wavelengths. The sensitivities of CL10 (1.88%/K) and CL6 (1.58%/K) are comparable to or even higher than the sensitivities of other LIF dyes provided in the literature. The literature-based dyes were however not determined in those cooling lubricants. The measurements showed, that the investigated tracer-cooling lubricant/water emulsions mixed with the dye enable a reliable temperature determination.

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Section: Introductionmentioning

confidence: 99%

A novel laser-induced fluorescence concept for thermometry measurements in machining lubricoolants

Koegl,

Glahn,

Zigan

2024

Meas. Sci. Technol.

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“…show large absorption cross-sections as well [27]. Rhodamine B works well in combination with ethanol and water [30][31][32][33][34]. Fluorescein can either be dissolved in water or ethanol [35][36][37].…”

Section: Introductionmentioning

confidence: 99%

Spectral Investigations of Fluorescence Tracers in Automotive and Aviation Fuels under Cryogenic Conditions

Koegl,

Vogler,

Zigan

2024

Sensors

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This study investigated spectral laser-induced fluorescence signals of dyes in fuels for automotive and aerospace applications under low temperatures and cryogenic conditions down to 183 K. For this purpose, a fluorescence chamber was developed based on cooling with liquid nitrogen. The design enabled a minimal inner chamber temperature of 153 K. Furthermore, the applicability of two-color LIF for liquid thermometry was evaluated under these conditions. The temperature determination was based on the temperature-sensitive fluorescence intensity ratio of the special dyes doped into the fuels determined in suitable spectral regions, which represented common bandpass filters. For this purpose, the fluorescence signals of the dye doped into the gasoline and jet fuel surrogate isooctane were tested as well as blends of isooctane and the ethanol biofuels E20 (comprising 80 vol.% isooctane and 20 vol.% ethanol), E40, and E100. Additionally, a realistic multi-component fuel Jet A-1 mixed with a suitable fluorescence dye was investigated. E100 was doped with Eosin-Y, and the remaining fuels were doped with Nile red. Temperature-dependent spectral LIF intensities were recorded in the range of 183 K–293 K, which simulate extreme environments for aerospace and automotive applications. Frozen fuel–dye mixtures cause significant extinction effects and prevent sufficient signal detection at low and cryogenic temperatures, defining the detection limit. A temperature decrease led to a spectral shift in the emission peaks of E100 doped with Eosin-Y toward shorter wavelengths, while the spectra of mixtures doped with Nile red were shifted toward longer wavelengths. The suggested bandpass filters produced the temperature-sensitive intensity ratio (the average over the temperature interval) of the dyes with the largest sensitivity for Jet A-1 (5.2%/K), followed by E100 (4.95%/K), E40 (4.07%/K), E20 (3.23%/K), and isooctane (3.07%/K), even at cryogenic temperatures.

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“…Although coumarin shows a superior temperature sensitivity, it must be excited in the UV wavelength range, which may be disadvantageous for certain solvents that show absorption in the UV spectrum as well. Rhodamine B works well in ethanol and water [43][44][45][46][47]. Fluorescein is often used in combination with water and ethanol [48][49][50].…”

Section: Introductionmentioning

confidence: 99%

Characterization of Fluorescence Tracers for Thermometry and Film Thickness Measurements in Liquid Coolants Relevant for Thermal Management of Electric and Electronic Components

Koegl

Delwig

Zigan

2022

Sensors

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This study investigated a novel two-color LIF (laser-induced fluorescence) technique for thermometry in coolants relevant for electric components. In principle, this diagnostic enables thermometry in liquid flows but also a simultaneous determination of film thickness and film temperature, which is relevant, e.g., for jet impingement cooled electric components. Temperature measurements are based on a temperature-sensitive intensity ratio of special tracers realized by suitable band pass filters within the respective emission spectra. For this purpose, the heat transfer fluids Fragoltherm F12, Marlotherm LH, and a water–glycol mixture WG20 (80 vol.% water, 20 vol.% glycol) and its individual components were doped with suitable tracers. The tracer Eosin-Y was utilized for polar coolants (water, WG20, and glycol) and Nile red was utilized for non-polar solvents (Fragoltherm F12 and Marlotherm LH). The spectral LIF intensities were recorded for a wide range of temperatures (253–393 K), which are relevant for cooling of electric motors, batteries, and power electronics. Furthermore, absorption spectra were analyzed as well. The temperature-dependent fluorescence measurements revealed different behavior for the polar and non-polar solvents. A temperature increase in the polar solvents (water, WG20, glycol) led to a spectral shift of the emission peaks of Eosin-Y towards longer wavelengths (red-shifted), while the peaks of Nile red in the non-polar solvents (Fragoltherm F12 and Marlotherm LH) showed an opposite behavior and were blue-shifted. The highest average temperature sensitivity was achieved for Marlotherm LH (4.22%/K), followed by glycol (1.99%/K), WG20 (1.80%/K), water (1.62%/K), and Fragoltherm F12 (1.12%/K). These sensitivities are similar to or even much higher than the literature data of other LIF tracers, which were, however, not determined in those coolants. Consequently, the two novel proposed dyes for the studied heat transfer liquids enable a reliable temperature determination.

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Nonlinear temperature calibration equation for Rhodamine B in different solutions for wide-temperature-range applications

Cited by 9 publications

References 23 publications

A novel laser-induced fluorescence concept for thermometry measurements in machining lubricoolants

A novel laser-induced fluorescence concept for thermometry measurements in machining lubricoolants

Spectral Investigations of Fluorescence Tracers in Automotive and Aviation Fuels under Cryogenic Conditions

Characterization of Fluorescence Tracers for Thermometry and Film Thickness Measurements in Liquid Coolants Relevant for Thermal Management of Electric and Electronic Components

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