Apparatus and method for the measurement of mass and density and/or for the measurement of the humidity of portioned units

US8330473B2 · kind B2 · utility

Assignee

• TEWS Elektronik GmbH & Co. KG · DE

Inventors

• Rainer Herrmann · Hamburg, DE
• Udo Schlemm · Hamburg, DE
• Stefan Zaage · Hannover, DE
• Harald Ceslik · Hamburg, DE

Key dates

• Filing date: Jan 6, 2010
• Grant date: Dec 11, 2012
• Expiry date: Sep 15, 2030

Classification

• Technology area (CPC G): Physics
• CPC primary: G01N22/04
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

Method and apparatus for the measurement of mass or density and/or for the measurement of the humidity in a plurality of portioned units in a non-metallic carrier material, which provides the following: a microwave measuring instrument, consisting of at least one microwave resonator for generating at least one resonance mode in a spatially limited measurement area and an analyzing unit for analyzing at least one variable of the at least one resonance mode, a conveying device for the carrier material, which transports the carrier material with the portioned units through the measurement area, the microwave measuring instrument measures at least one variable of the at least one resonance mode at a time when only the carrier material without portioned unit is in the measurement area, and at a time when the portioned unit is at least partially in the measurement area, the analyzing unit subtracts the variable measured for the carrier material from the measurement values for the portioned unit, and determines a value of the humidity and/or of the mass or density of the portioned unit from at least one difference by way of an input-output map.