Two-dimensional evaluation of soil property based on thermal imaging

Temperature response of soil specimens, which is one of major contains of volcanic ash soil, are measured by pulse heating technique. Water contents of various specimens are evaluated from temperature response of specimens using two-dimensional radiation thermometer and thermocouples. Infrared radiation thermometry is a non-contact and non-destructive technique to detect the properties or internal conditions of a material from the temperature variation of surface. Decay lifetime of surface temperature is calculated with exponential curve composed from two decay components. Two-dimensional distribution of faster component dasiatau₁psila is evaluated with using thermal images. Two-dimensional distribution of water contents can be evaluated using lifetime of faster decay components calculated from thermal imaging. Dynamic characteristics of soil are suggested to be useful for evaluation of soil for agriculture.