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An Alternative Technique for the Interpretation of Temperature Measurements Using Thermochromic Liquid Crystals

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.