Luminescent two-color tracer particles for simultaneous velocity and temperature measurements in microfluidics. Massing, J., Kaden, D., Kaehler, C. J., & Cierpka, C. MEASUREMENT SCIENCE AND TECHNOLOGY, NOV, 2016.
doi  abstract   bibtex   
The simultaneous and non-intrusive measurement of temperature and velocity fields in flows is of great scientific and technological interest. To sample the velocity and temperature, tracer particle based approaches have been developed, where the velocity is measured using PIV or PTV and the temperature is obtained from the intensity (LIF, thermographic phosphors) or frequency (TLC) of the light emitted or reflected by the tracer particles. In this article, a measurement technique is introduced, that relates the luminescent intensity ratio of individual dual-color luminescent tracer particles to temperature. Different processing algorithms are tested on synthetic particle images and compared with respect to their accuracy in estimating the intensity ratio. Furthermore, polymer particles which are doped with the temperature sensitive dye europium (III) thenoyltrifluoroacetonate (EuTTA) and the nearly temperature insensitive reference dye perylene are characterized as valid tracers. The results show a reduction of the temperature measurement uncertainty of almost 40% (95% confidence interval) compared to previously reported luminescent particle based measurement techniques for microfluidics.
@article{ ISI:000385481700001,
Author = {Massing, J. and Kaden, D. and Kaehler, C. J. and Cierpka, C.},
Title = {{Luminescent two-color tracer particles for simultaneous velocity and
   temperature measurements in microfluidics}},
Journal = {{MEASUREMENT SCIENCE AND TECHNOLOGY}},
Year = {{2016}},
Volume = {{27}},
Number = {{11}},
Month = {{NOV}},
Abstract = {{The simultaneous and non-intrusive measurement of temperature and
   velocity fields in flows is of great scientific and technological
   interest. To sample the velocity and temperature, tracer particle based
   approaches have been developed, where the velocity is measured using PIV
   or PTV and the temperature is obtained from the intensity (LIF,
   thermographic phosphors) or frequency (TLC) of the light emitted or
   reflected by the tracer particles. In this article, a measurement
   technique is introduced, that relates the luminescent intensity ratio of
   individual dual-color luminescent tracer particles to temperature.
   Different processing algorithms are tested on synthetic particle images
   and compared with respect to their accuracy in estimating the intensity
   ratio. Furthermore, polymer particles which are doped with the
   temperature sensitive dye europium (III) thenoyltrifluoroacetonate
   (EuTTA) and the nearly temperature insensitive reference dye perylene
   are characterized as valid tracers. The results show a reduction of the
   temperature measurement uncertainty of almost 40\% (95\% confidence
   interval) compared to previously reported luminescent particle based
   measurement techniques for microfluidics.}},
DOI = {{10.1088/0957-0233/27/11/115301}},
Article-Number = {{115301}},
ISSN = {{0957-0233}},
EISSN = {{1361-6501}},
ResearcherID-Numbers = {{Cierpka, Christian/C-2725-2011
   Kahler, Christian/D-5932-2011}},
Unique-ID = {{ISI:000385481700001}},
}
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