Design and Measurement of Microwave Resonant Cavity for Trace Moisture Determination of Polymer Powder
The design and measurement of the coaxial resonator used for measuring the moisture content of polymer materials is studied. The resonant frequency of the processed empty resonator cavity is 3.38 GHz,and the loaded Q value is 3328. Two kinds of polytetraflu-oroethylene powders with moisture content of 0.06％ and 0.24％ are selected,and the relationships between the powder volume ratio and the mixed dielectric constant and loaded Q value is analyzed to verify the resolution of the resonant cavity for trace moisture content powders. The measurement results show that the designed resonant cavity can be effectively used for the resolution of powder moisture content in the range of trace moisture content,and has the potential to carry out precise measurement of moisture content according to loaded Q value.
microwave measurementcoaxial resonatorpowder moisture contentdielectric constantquality factorpowder volume ratio
万方数据
维普
