Patent ID: 8008928

Claim:
An apparatus for measuring mass and/or moisture of dielectric objects, the apparatus comprising: an analysing unit; at least two high frequency generators; at least two high frequency detectors; and a high frequency resonator, wherein the at least two high frequency generators simultaneously generate at least two modes that are independent from each other, each mode having a resonance frequency that is different from the resonance frequencies of the other modes, two neighboring frequencies having a minimum distance of 100 MHz, and the electric fields of each mode stand vertically to the electric fields of each other mode in a measurement region, wherein the at least two high frequency detectors measure the occurring frequencies for each mode in the resonator simultaneously, and wherein the analysing unit: determines a shift of the resonance frequency and a change of the resonance curve for the measured frequencies in each mode, and calculates the mass and/or moisture of the dielectric object from the determined values for the shift of the resonance frequency and the change of the resonance curve.