On a static and dynamic calibration of thermochromic liquid crystals

Authors

  • Stanislav Solnař Czech Technical University in Prague, Faculty of Mechanical Engineering, Department of Process Engineering, Technická 4, 160 00 Prague 6, Czech Republic
  • Jan Medek Czech Technical University in Prague, Faculty of Mechanical Engineering, Department of Process Engineering, Technická 4, 160 00 Prague 6, Czech Republic
  • Abubakar Shola Suleiman Czech Technical University in Prague, Faculty of Mechanical Engineering, Department of Process Engineering, Technická 4, 160 00 Prague 6, Czech Republic
  • Patrik Vyhlídal Czech Technical University in Prague, Faculty of Mechanical Engineering, Department of Process Engineering, Technická 4, 160 00 Prague 6, Czech Republic

DOI:

https://doi.org/10.14311/AP.2021.61.0562

Keywords:

thermochromic liquid crystals, TLC, static, dynamic, calibration

Abstract

The paper deals with a static and dynamic calibration of selected wide-range thermochromic liquid crystals (TLC - SolarDust 24C), which are very easy to ingest and can provide accurate information on the temperature distribution on different surfaces. Static calibration problems, such as TLC illumination angle or illumination intensity, are solved and conclusions are drawn for the application of such a measurement. Dynamic experiments also indicate a certain time delay (around 50 ms) of the applied TLC measurement layer, which is very important to know for dynamic experimental methods, but the error and inaccuracy of the experiment is too high to draw conclusions.

References

P. Vyhlídal. Problems of surface temperature measurement using themochromic crystals (in Czech). Master’s thesis, Czech Technical University in Prague, Faculty of Mechanical Engineering, 2019.

A. S. Suleiman. Thermochromic liquid crystals as a temperature indicator. Master’s thesis, Czech Technical University in Prague, Faculty of Mechanical Engineering, 2019.

J. Medek. Thermochromic liquid crystals (TLC) calibration (in Czech). Master’s thesis, Czech Technical University in Prague, Faculty of Mechanical Engineering, 2020.

P. J. Newton, Y. Yan, N. E. Stevens, et al. Transient heat transfer measurements using thermochromic liquid crystal. part 1: An improved technique. International Journal of Heat and Fluid Flow 24(1):14–22, 2003. https://doi.org/10.1016/S0142-727X(02)00206-0.

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J. Stasiek, M. Jewartowski, T. A. Kowalewski. The use of liquid crystal thermography in selected technical and medical applications — recent development. Journal of Crystallization Process and Technology 4(1):46–59, 2014. https://doi.org/10.4236/jcpt.2014.41007.

Y. Rao, S. Zang. Calibrations and the measurement uncertainty of wide-band liquid crystal thermography. Measurement Science and Technology 21(1):1–8, 2010. https://doi.org/10.1088/0957-0233/21/1/015105.

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Published

2021-08-31

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Articles