摘要 |
A generator ( 6 ) directs microwave signals to a waveguide ( 1 ) having a linear array of slots ( 2 ), and the signals are received by measuring device ( 5 ). The local permittivity or moisture content of material adjacent the waveguide ( 1 ), such as a stack of timber, may be determined at each slot ( 2 ) via regression analysis. The total permittivity or moisture may be determined by averaging measurements obtained for both transmission directions of the waveguide ( 1 ). The apparatus may be used for controlling drying parameters, such as drying time, for the material. |