Fill level measuring device working with microwaves

US8884632B2 · kind B2 · utility

Assignee

• ENDRESS+HAUSER GMBH+CO.KG · DE

Inventors

• Peter Klofer · Steinen, DE
• Winfried Mayer · Hobrechtsfelde, DE

Key dates

• Filing date: Aug 12, 2009
• Grant date: Nov 11, 2014
• Expiry date: Oct 18, 2031

Classification

• Technology area (CPC G): Physics
• CPC primary: G01F23/284
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

A fill level measuring device. On a plurality of different signal paths, microwave signals can be transmitted into a container, and their associated echo signals recorded. The device includes: measuring device electronics having a microwave generator for the successive production of microwave signals; and, connected thereto, a frequency-selective, passive antenna arrangement, which has a number of frequency-selective elements—especially bandpass filters—in each case transmissive for one of the different wanted frequencies. Via the antennas and the frequency-selective elements, for each of the different microwave signals and its echo signal, a uniquely associated signal path is specified, via which a microwave signal is transmitted into the container and its echo signal, reflected back to the antenna arrangement, is received and fed to the measuring device electronics. The device also includes an apparatus, which is provided in the measuring device electronics and which associates successively arriving echo signals with the associated signal path.