Device and method for measuring the mass and/or humidity of dielectric objects by determining the quality factor and the resonance frequency of three non-degenerated, orthogonal modes of a cavity resonator

摘要

device for mass - and / or moisture measurement of dielectric objects (40) with an evaluation unit (44), at least a high-frequency generator (14,16,18), at least one hochfrequenzdetektor (32,34,36) and a hochfrequenzresonator (12) with entry and inlets, through the the objects (4) to move;- at least a high-frequency generator (14,16,18) of at least three independent modes with different resonant frequencies of the resonator (12) can generate with the electric fields of the modes in a measuring range (42) to each other and perpendicular to two adjacent r esonanzen a distance of at least 100 mhz arethe at least one hochfrequenzdetektor (32,34,36) for each mode in the resonator, the occurring frequencies can be measured, andthe evaluation unit (44) for the measured frequencies in each mode, a shift of the resonance frequency and a change in the resonance curve (such as: resonanzbreite, resonanzamplitude) may be determined and the specific values for the shift of the resonance frequency and the change the resonance curve and the weight and / or moisture of the dielectric object can calculate- with the results of fashions in the pedal right to the floor of an object (40) by the resonator (12) to be repeatedly for a fashion from this series, then the maximum of the resonance frequency of the object 1 in pedal right to the floor (4) of the resonator (12) is determined and the values of r fashions at the time;in the said mode, the maximum of the resonance frequency has been detected 5.