Patent ID: 8868358
Filing Date: 2014-10-21
Classification: G01F,G01S,H01Q

Abstract:
1. A fill level measuring device working with microwaves according to a travel time principle for measuring the fill level of a fill substance in a container, comprising: a transmitting and receiving system, for producing a higher frequency microwave signal and a lower frequency microwave signal having markedly lower frequencies, for simultaneous or successive transmission of these microwave signals into the container directed toward the fill substance, and for receiving higher frequency and the lower frequency echo signals of the microwave signals reflected in the container back to the transmitting and receiving system, to determine the fill level on the basis of the travel time of the microwave signals; a processing system; and; a single antenna, wherein: said transmitting and receiving system includes: an internally funnel shaped horn; two hollow conductor segments connected with one another and connected to said horn; a coaxial conductor connector connected to a first hollow conductor segment directly adjoining said horn, via which said antenna is fed with the lower frequency microwave signal and the associated lower frequency echo signal is received; and a second hollow conductor segment connected to a horn-remote end of said first hollow conductor segments arranged on an end of said second hollow conductor segment adjoining said horn, via which said antenna is fed with the higher frequency microwave signal and the associated higher frequency echo signal is received; and said processing system checks whether the higher frequency and lower frequency echo signals are attributable to a reflection from the same surface of the fill substance, or from the fill substance of an upper fill substance layer having a lower density, and from the fill substance of a lower fill substance layer having a higher density.