Abstract: A measuring device (1) is provided for measuring the flow rate of a medium (5) flowing through measuring tube (3). The measuring device (1) contains means for generating a constant magnetic field (B) perpendicular to the flow direction (v) of the medium (5) and at least two decoupling regions (7, 7?) which are disposed in a plane (E) perpendicular to the flow direction (v) of the medium (5) on the wall (9) of the measuring tube (3). Each decoupling region (7, 7?) comprises an electrode (13, 13?) which has a non-metal porous layer (11) on the side facing the medium (5) and a measuring unit (19) for detecting a measuring signal. In the measuring device (1), the porous layer (11, 11?) comprises an oxidic and/or non-oxidic ceramic material.

Abstract: A measuring device (1) is provided for measuring the flow rate of a medium (5) flowing through measuring tube (3). The measuring device (1) contains means for generating a constant magnetic field (B) perpendicular to the flow direction (v) of the medium (5) and at least two decoupling regions (7, 7?) which are disposed in a plane (E) perpendicular to the flow direction (v) of the medium (5) on the wall (9) of the measuring tube (3). Each decoupling region (7, 7?) comprises an electrode (13, 13?) which has a non-metal porous layer (11) on the side facing the medium (5) and a measuring unit (19) for detecting a measuring signal. In the measuring device (1), the porous layer (11, 11?) comprises an oxidic and/or non-oxidic ceramic material.

Abstract: A method is provided for measuring the mean flow velocity of an electrically conductive medium while applying a magnetic field to the measurement volume put through and decoupling an electric signal induced in the measurement volume. The fluctuating part of the electric signal, which is based on stochastic fluctuations of the flow velocity due to turbulent motion, is captured as a time-dependent wanted signal. By the weighted integration of the wanted signal the mean flow velocity over predefined time intervals is determined.

Abstract: A method is provided for measuring the mean flow velocity of an electrically conductive medium while applying a magnetic field to the measurement volume put through and decoupling an electric signal induced in the measurement volume. The fluctuating part of the electric signal, which is based on stochastic fluctuations of the flow velocity due to turbulent motion, is captured as a time-dependent wanted signal. By the weighted integration of the wanted signal the mean flow velocity over predefined time intervals is determined.

Abstract: A method is provided for measuring the flow rate of a medium in a volume subjected to a magnetic field. The electrical resistance of a semiconductor arranged adjacent to the volume is measured, and the flow rate of the medium is computed from this electrical resistance.

Abstract: A method is provided for measuring the flow rate of a medium in a volume subjected to a magnetic field. The electrical resistance of a semiconductor arranged adjacent to the volume is measured, and the flow rate of the medium is computed from this electrical resistance.

Abstract: A method for measuring a flow rate of a medium through a measuring tube which is penetrated by a constant magnetic field orthogonal to a flow direction and in which an electrical voltage building up in the medium is sensed by electrodes, insulted with respect to the medium and located on an outer wall of the measuring tube in a plane orthogonal to the flow direction of the medium, in which the capacitance of at least one capacitive unit is formed by the electrodes, and a measuring tube interior area and a charge change brought about by a change to the at least one capacitive is determined, and from this a voltage is established which is determinative of the flow rate of the medium through the measuring tube.

Abstract: Method for measuring the flow rate of a medium flowing through a measuring tube and which is penetrated by a constant magnetic field (B) orthogonal to the flow direction and in which the electrical voltage (UO) building up in the medium is sensed by means of electrodes (3, 3′), insulated with respect to the medium and located on the wall of the measuring tube (2) in a plane orthogonal to the flow direction of the medium, in which the capacitance of at least one capacitive unit (C) formed by the electrodes (3, 3′) and the tube interior and the charge change brought about by the change to the at least one capacitive unit (C) is determined and from this the voltage (UO) is established.

Abstract: An ultrasonic flow meter has two ring-shaped piezoelectric transducers (1, 2) comprising ring-shaped piezoelectric elements or being composed of piezoelectric sections. Both the transducers (1, 2) are arranged in axial symmetry in a distance to each other. One of them is operated as the ultrasonic transmitter and the other one as ultrasonic receiver. The medium, the flow rate of which is to be measured, flows through both the transducers (1, 2) essentially parallel to the axis (L--L).

Abstract: An apparatus and a method for the measurement of the complex dielectric constant of a material by evaluating the amount of detuning introduced by the presence of the material. In order to simplify the circuitry required for measurement and evaluation according to the invention there are provided two rf resonators (8, 8') of the same construction, each of them comprising a dielectric solid state resonator (1, 1') in a case having a first conductive section (2, 2') and a second section (3, 3'), which is permeable for alternating fields. Both the rf resonators are positioned to each other in such a way as to provide a shielding effect by their conductive case sections (2, 2') against mutual interference and to have their sections permeable for electromagnetic fields (3, 3') facing towards the material to be measured.