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Abstract
A new technique for the interpretation of temperature measurements carried out using the thermochromic liquid crystals is presented together with a new calibration method. The present method uses each one of the three components—red, green, and blue—for color description and allows measurements in a larger temperature range than the standard calibration methods, which are based on the reduction of the color components to a single quantity representing hue. The measurement procedure also includes the correction for illumination changes during each experiment. The measurements quality is checked on the well-known case of heat transfer measurements from an impinging jet. Finally, the different properties of liquid crystals are discussed.
ACKNOWLEDGMENTS
This research was supported by the European Commission (project no. G1MA-CT-2002-04019) and by the Academy of Sciences of the Czech Republic (project no. K4040110).