Measurement of water content of unsaturated soil by TDR technique

For the applications of coaxial-cable electromagnetic wave reflection technique in measuring soil water content and pore ratio,the interaction model for EM wave and single media was deduced based upon polarization mechanism.Then the relationship between dielectric constant and volume water content or pore ratio of unsaturated soil was established.Different kinds of soil samples were tested.From the experimental results,it was found out that the relation curves of soil samples were almost consistent with each other and fittd the model well.