Method and device for measuring the position of segments with absorbing substances in multi-segment filter rods of the tobacco processing industry

US9528823B2 · kind B2 · utility

Assignee

• TEWS Elektronik GmbH & Co. KG · DE

Inventors

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

Key dates

• Filing date: Dec 21, 2012
• Grant date: Dec 27, 2016
• Expiry date: Sep 15, 2033

Classification

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

Abstract

A method and device for measuring the position of sections with an absorbing substance in multi-segment filter rods of the tobacco processing industry by measuring a varying shift of the resonance frequency A and/or spread of the resonance line B during movement of the rod in the longitudinal direction, using a microwave resonator, which has a field concentration in a spatial area, wherein this spatial area is smaller in the rod direction than the segment length to be determined, forming a difference quotient ΔA of the resonant frequency shift A and/or ΔB of the resonance line spread B relative to the longitudinal direction, determining local extreme values of the respective difference quotients, and assigning local extreme values as a position of a transition from a section with higher content of absorbing substance to a section without, or with lower content, of absorbing substance, and vice versa.