Microwave leakage field sensor for measuring moisture and/or density

US6316946A · kind A · utility

Assignee

• Manfred Tews · DE

Inventors

• Rainer Herrmann · Hamburg, DE
• Stefan Zaage · Hannover, DE

Key dates

• Filing date: Sep 16, 1998
• Grant date: Nov 13, 2001
• Expiry date: Sep 16, 2018

Classification

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

Abstract

The microwave leakage field sensor for measuring moisture and/or density of dielectric materials is distinguished by the fact that it is of essentially rotationally symmetrical design and transmissive for electromagnetic radiation in the axial direction toward at least one side, and that an essentially rotationally symmetrical alternating field of standing waves can be generated in it, the spatial period of which field in the peripheral direction is less than the vacuum wavelength at the frequency of the alternating field.