Moisture measurement in walls using microwaves

A novel measurement procedure and set-up is presented, which is suitable for moisture measurements in brick- and stone walls at places, where the wall is accessible only from one side. Local dielectric constant and hence spatial moisture content profile are determined by tracing the complex electric field using an electrically small field probe, which intrudes and is moved in a small bore-hole. Only one hole with a diameter of 8-15 mm is needed. A prototype setup and measurements are presented in order to demonstrate the practicability of the method.<>