Device for testing the quality of rope-like materials

US6897659B2 · kind B2 · utility

Assignee

• TEWS Elektronik · DE

Inventors

• Rainer Herrmann · Hamburg, DE
• Manfred Tews · Seevetal, DE
• Udo Schlemm · Hamburg, DE

Key dates

• Filing date: Jun 12, 2003
• Grant date: May 24, 2005
• Expiry date: Jun 12, 2023

Classification

• Technology area (CPC G): Physics
• CPC primary: G01N33/365
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

A device for testing the quality of rope-like materials in the form of yarns, rollings, fiber bands and the like employs a microwave resonator and devices for determining the displacement of the resonant frequency and the widening of the resonance curve due to the rope-like material present in the microwave resonator. Mechanical devices are provided for transporting the rope-like materials through the measuring volume of the microwave resonator. The microwave field is homogeneous in the measuring volume and the measuring device is a microwave generator constructed for measuring the mass per length and the moisture of the rope-like materials. Sensitivity of the device is improved by using metallic elements to concentrate the electromagnetic field in the measuring volume.