Microwave textile dampness detector - uses attenuated electric field of TEM mode generated in strip line

摘要

The TEM microwave mode is used to determine the dampness of sheet material used in the textile industry. The strip line (1) consists of a conductor (2) on a dielectric layer (6) which has a fully metallized back surface (5). The top surface is covered by a resin layer (10). The dimensions ensures the generation of a pure TEM wave. Input and output coaxial conductors (7, 7a) are joined by slub lines (4, 4a) to the strip line. The material moves over the assembly and the microwave E-field is attenuated by the material dampness.