Measurement assembly for determining a property of a multiphase flowable medium

A measurement assembly for determining a property of a multiphase, flowable medium, comprising:

• a measuring tube for conveying the medium, wherein the measuring tube has a first antenna receptacle;
• a first microwave antenna device arranged in the first antenna receptacle, wherein the first microwave antenna device is designed to emit a first microwave signal having a first main radiation direction and a second microwave signal having a second main radiation direction that differs from the first main radiation direction;
• and
• a measurement circuit connected to the first microwave antenna device,
• wherein the measurement circuit has a high-frequency generator for supplying the first microwave antenna device with the first microwave signal and the second microwave signal,
• wherein the measurement circuit is configured to determine the property of the medium at least on the basis of a measured first microwave signal, and
• wherein the measurement circuit is further configured to detect any inhomogeneity in the medium in the measuring tube on the basis of the measured first microwave signal and a measured second microwave signal.

A method for determining any inhomogeneity in a measuring tube, comprising:

• providing a measurement assembly, including:
• a measuring tube for conveying the medium, wherein the measuring tube has a first antenna receptacle and a second antenna receptacle opposite the first antenna receptacle;
• a first microwave antenna device arranged in the first antenna receptacle, wherein the first microwave antenna device is designed to emit a first microwave signal having a first main radiation direction and a second microwave signal having a second main radiation direction that differs from the first main radiation direction;
• a second microwave antenna device that is arranged in the second antenna receptacle, wherein the second microwave antenna device is configured to measure the first microwave signal and the second microwave measurement signal;
• and
• a measurement circuit, connected to the first microwave antenna device,
• wherein the measurement circuit has a high-frequency generator for supplying the first microwave antenna device with the first microwave signal and the second microwave signal,
• wherein the measurement circuit is configured to determine the property of the medium at least on the basis of a measured first microwave signal, and
• wherein the measurement circuit is further configured to detect any inhomogeneity in the medium in the measuring tube on the basis of the measured first microwave signal and a measured second microwave signal;
• emitting, via the first microwave antenna device, the first microwave signal having the first main radiation direction into the measuring tube;
• receiving, via the second microwave antenna device, the first microwave signal after emission, wherein the received first microwave signal results at least from the emitted first microwave signal and its interaction with the medium;
• emitting, via the first microwave antenna device, the second microwave signal having the second main radiation direction into the measuring tube, wherein the first main radiation direction differs from the second main radiation direction;
• receiving the second microwave signal after emission via the second microwave antenna device, wherein the received second microwave signal results at least from the second microwave signal and its interaction with the medium, wherein the second microwave signal is reflected at least once on an inner lateral surface of the measuring tube so that the second propagation direction spatially changes at least once between the emission of the second microwave signal and the reception of the second microwave signal;
• and
• detecting whether there is any inhomogeneity in the measuring tube depending on the received first microwave signal and the second microwave signal.