Patent · US Expired

Method of detecting foreign bodies in mass streams

US6922061B2 · kind B2 · utility

5Cited by

2References

7Claims

0Family size

Assignee

TEWS ELECTRONIK DIPL. ING. MANFRED TEWS · DE

Inventors

Rainer Herrmann · Hamburg, DE
Stefan Zaage · Hannover, DE
Harald Ceslik · Hamburg, DE

Key dates

Filing date	Jan 9, 2003
Grant date	Jul 26, 2005
Priority date	—
Expiry date	Jan 26, 2023

Classification

Technology area (CPC G)Physics
CPC primaryG01N22/00
WIPO fieldMeasurement
WIPO sectorInstruments

Abstract

The method of detecting foreign bodies in continuous mass streams of fibrous material, strand-like material or material similar to bulk goods with the aid of microwaves, in which the mass flow is led through the field of a microwave resonator and in which the change (A) in the resonant frequency, effected by the material, and the change (B) in the width of the resonance curve of the microwave resonator is determined, is distinguished in that the ratio (B/A) of the changes is evaluated and compared with corresponding averages, and the presence of a foreign body is reported when the ratio differs from the averages by more than a predefined value.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.