Abstract
Thermo-sensitve liquid crystal display thermal distribution as it changes color according to temperature. By using the developed color image processing technique, spatial thermal information can be obtained. However, modification of the relation between color and temperature is necessary, because the color also depends on an observation angle. The modification is made possible by observing color distribution in the constant temperature field. Liquid crystal is in general inappropriate for measuring a wide thermal range, because its thermo-sensitive range is relatively narrow. Authors expanded this approach to measurement of a wider temperature range using two mixed ratios of liquid crystal with different thermo-sensitive ranges. Applying this approach, thermal plume in a natural convection field is successfully examined.
