Flow sensor, method and flowmeter for determining speeds of phases of a multi-phase medium
AssigneeKrohne AG
InventorsYves Louis Janssens, Cornelis Johannes Hogendoorn
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Abstract
A flow sensor for a multi-phase medium flowmeter has a sensor carrier, and the sensor carrier has at least one first sensor array. The at least one first sensor array has a first permittivity sensor for determining a first permittivity of a multi-phase medium, a second permittivity sensor for determining a second permittivity of the medium, a density sensor for determining a density of the medium, and a first sensor axis. The first permittivity sensor, the second permittivity sensor, and the density sensor are arranged on the sensor carrier along the first sensor axis, and the first permittivity sensor and the second permittivity sensor are spaced apart with a permittivity sensor distance.
Claims6
A method for determining speeds of phases of a multi-phase medium, comprising:
- immersing a flow sensor into a flowing multi-phase medium, the flow sensor including:
- a sensor carrier having at least one first sensor array;
- the at least one first sensor array has a first permittivity sensor for determining a first permittivity of a multi-phase medium, a second permittivity sensor for determining a second permittivity of the medium, a density sensor for determining a density of the medium, and a first sensor axis;
- the first permittivity sensor, the second permittivity sensor, and the density sensor are arranged on the sensor carrier along the first sensor axis;
- and
- the first permittivity sensor and the second permittivity sensor are spaced apart with a permittivity sensor distance;
- determining a first permittivity curve with the first permittivity sensor, determining a second permittivity curve with the second permittivity sensor, and determining a density curve of the medium with the density sensor;
- and
- determining at least one speed of a phase of the medium from the first permittivity curve, the second permittivity curve, and the density curve using a correlation method.
A flowmeter for determining speeds of phases of a multi-phase medium in a measuring tube, the flowmeter comprising:
- a sensor control;
- a measuring tube;
- and
- at least one first flow sensor;
- the at least one first flow sensor including:
- a sensor carrier having at least one first sensor array;
- the at least one first sensor array has a first permittivity sensor for determining a first permittivity of a multi-phase medium, a second permittivity sensor for determining a second permittivity of the medium, a density sensor for determining a density of the medium, and a first sensor axis;
- the first permittivity sensor, the second permittivity sensor, and the density sensor are arranged on the sensor carrier along the first sensor axis;
- and
- the first permittivity sensor and the second permittivity sensor are spaced apart with a permittivity sensor distance;
- the sensor control is designed for carrying out a method including the following steps:
- immersing the at least one first flow sensor into a flowing multi-phase medium
- determining a first permittivity curve with the first permittivity sensor, determining a second permittivity curve with the second permittivity sensor, and determining a density curve of the medium with the density sensor;
- and
- determining at least one speed of a phase of the medium from the first permittivity curve, the second permittivity curve, and the density curve using a correlation method;
- and
- the at least one first flow sensor is arranged at a first measuring position on the measuring tube so that when a multi-phase medium flows through the measuring tube, the medium flows around the flow sensor, the flow sensor has a first immersion depth in the medium, and the first sensor axis has a component parallel to a direction of flow of the medium.
Dependencies are inferred from the claim text.