A novel laser-induced fluorescence concept for thermometry measurements in machining lubricoolants
Koegl M, Glahn J, Zigan L (2024)
Publication Type: Journal article
Publication year: 2024
Journal
Book Volume: 35
Article Number: 055210
Journal Issue: 5
Abstract
This study investigates a two-colour laser-induced fluorescence (LIF) 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 CL 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 CL. The measurements showed, that the investigated tracer-CL/water emulsions mixed with the dye enable a reliable temperature determination.
Involved external institutions
Germany (DE)How to cite
APA:
Koegl, M., Glahn, J., & Zigan, L. (2024). A novel laser-induced fluorescence concept for thermometry measurements in machining lubricoolants. Measurement Science and Technology, 35(5). https://dx.doi.org/10.1088/1361-6501/ad28ea
MLA:
Koegl, Matthias, Jake Glahn, and Lars Zigan. "A novel laser-induced fluorescence concept for thermometry measurements in machining lubricoolants." Measurement Science and Technology 35.5 (2024).
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