Abstract: The invention relates to an ultrasonic transducer (1) for transmitting and/or for receiving ultrasonic waves, comprising a backing layer (2), a matching layer (A) for impedance matching to the fluid (F), a piezoelectric element (4) arranged between the backing layer (2) and the matching layer (A), a first electrode (3a) between the support layer (2) and the piezo element (4) providing a first electrical contact (K1) of the piezo element (4), wherein the matching layer (A) is formed by a flexible printed circuit board (Lp) and the flexible printed circuit board (Lp) provides a second electrical contact (K2) of the piezo element (4).

Abstract: A throughflow measurement system for measuring a fluid throughflow through a pipe includes a first measurement arrangement having at least two ultrasonic transducers and that is configured to determine a value for the fluid throughflow through the pipe on the basis of transit times of ultrasonic signals transmitted and received with and against the flow. A second measurement arrangement includes a plurality of hot-wire sensors that are arranged distributed over the cross-section of the pipe and that are each configured to determine a local flow value. An evaluation device is in signal connection with the first measurement arrangement and the second measurement arrangement and is configured to determine a flow profile on the basis of the local flow values determined by the hot-wire sensors and to modify the value for the fluid throughflow, which is determined by the first measurement arrangement, on the basis of the determined flow profile.

Abstract: The invention relates to a flow measuring device comprising a meter body having a conduit for the fluid, two phased-array ultrasonic transducer units spaced apart in the longitudinal direction of the conduit, which can emit and receive ultrasonic signals at different angles, a control and evaluation unit for driving the ultrasonic transducer units and evaluating the received ultrasonic signals and determining the flow using the transit time of the ultrasonic signals on the measuring paths.

Abstract: A throughflow measurement system comprises a measurement body that has an inlet flange, an outlet flange and a fluid passage, wherein the fluid passage has a passage axis; an ultrasonic measurement apparatus integrated into the measurement body; and a flow conditioner arranged upstream of the ultrasonic measurement apparatus in the fluid passage. An arrangement of bores for fastening means is provided at the outlet flange, wherein an axially extending outlet fastening region of the measurement body is defined by the length of the bores. The ultrasonic measurement apparatus has at least one reflection measurement path that is spanned by a first ultrasonic transducer, a reflector and a second ultrasonic transducer and that extends in a measurement plane through the fluid passage such that the second ultrasonic transducer is arranged downstream of the first ultrasonic transducer. The second ultrasonic transducer disposed downstream is arranged in or projects into the outlet fastening region.

Abstract: Flow velocity of a fluid is measured using a measuring sensor comprising a conduit with a conduit wall, and at least two ultrasonic transducer units (20, 22), each of which consists of an array of individual ultrasonic transducers (30-x, 32-x) and defining a measuring path (24) between them in the conduit (14). The ultrasonic transducer units emit ultrasonic signals and received ultrasonic signals are evaluated to determine the flow velocity. The individual ultrasonic transducers are driven with different phase, so that the ultrasonic transducer units provide a phased array. In order to achieve the most accurate measurement results possible, the ultrasonic transducer units contact the outside of the conduit wall (16), and the conduit wall (16) is formed in the area of the contact with a wall thickness (w) that is less than half the wavelength of the transverse wave (?Rohr) of the ultrasound in the conduit wall.

Abstract: A throughflow measurement system for measuring a fluid throughflow through a pipe comprises a first measurement arrangement that comprises at least two ultrasonic transducers and that is configured to determine a value for the fluid throughflow through the pipe on the basis of transit times of ultrasonic signals transmitted and received with and against the flow; a second measurement arrangement that comprises a plurality of hot-wire sensors that are arranged distributed over the cross-section of the pipe and that are each configured to determine a local flow value; and an evaluation device that is in signal connection with the first measurement arrangement and with the second measurement arrangement and that is configured to determine a flow profile on the basis of the local flow values determined by the hot-wire sensors and to modify the value for the fluid throughflow, which is determined by the first measurement arrangement, on the basis of the determined flow profile.

Abstract: The invention relates to an ultrasonic transducer (1) for transmitting and/or for receiving ultrasonic waves, comprising a backing layer (2), a matching layer (A) for impedance matching to the fluid (F), a piezoelectric element (4) arranged between the backing layer (2) and the matching layer (A), a first electrode (3a) between the support layer (2) and the piezo element (4) providing a first electrical contact (K1) of the piezo element (4), wherein the matching layer (A) is formed by a flexible printed circuit board (Lp) and the flexible printed circuit board (Lp) provides a second electrical contact (K2) of the piezo element (4).

Abstract: The invention relates to a flow measuring device comprising a meter body having a conduit for the fluid, two phased-array ultrasonic transducer units spaced apart in the longitudinal direction of the conduit, which can emit and receive ultrasonic signals at different angles, a control and evaluation unit for driving the ultrasonic transducer units and evaluating the received ultrasonic signals and determining the flow using the transit time of the ultrasonic signals on the measuring paths.

Abstract: The invention relates to a device for measuring the flow velocity of a fluid having a measuring sensor comprising a pipe with a pipe wall, at least two ultrasonic transducer units (20 and 22), each of which consists of an array of individual ultrasonic transducers (30-x and 32-x) and defining a measuring path (24) between them in the pipeline (14), and a control and evaluation unit (34) for driving the ultrasonic transducer units (20, 22) to emit ultrasonic signals (28) and for evaluating received ultrasonic signals (28) and determining the flow velocity (v), wherein the control and evaluation unit (34) is designed to drive the individual ultrasonic transducers (30-x, 32-x) with different phase, so that the ultrasonic transducer units (20, 22) are each designed as a phased array.

Abstract: The invention relates to a measurement apparatus for measuring a flow rate of a fluid that flows with a main direction of flow in a circular line comprising an inlet section for conducting the fluid from the circular line into the measurement apparatus; an outlet section for conducting the fluid from the measurement apparatus into the circular line; a measurement section for connecting the inlet section to the outlet section; at least one ultrasound device for transmitting and/or receiving ultrasound waves, wherein the ultrasound device is arranged at a wall of the measurement section; and an evaluation unit for carrying out a time of flight difference measurement and for determining the flow rate, wherein the inlet section has a first superelliptic transitional shape and the outlet section has a second superelliptic transitional shape and the measurement section has a rectangular form, in particular having rounded corners.

Abstract: The flow speed of a fluid (12) flowing in a conduit (14) is measured using at least one ultrasonic transducer (18a-b) that is attached to the conduit wall (22) from the outside The transducer (18a-b) has an oscillating body (34) that couples to a part region (32) of the conduit wall (22) that acts as a membrane of the ultrasonic transducer (18a-b) that can vibrate. A coupling piece (36) whose cross-section is smaller than the cross-section of the oscillating body (34) is arranged between the membrane (32) and the oscillating body (34).

Abstract: The invention relates to a measurement apparatus for measuring a flow rate of a fluid that flows with a main direction of flow in a circular line comprising an inlet section for conducting the fluid from the circular line into the measurement apparatus; an outlet section for conducting the fluid from the measurement apparatus into the circular line; a measurement section for connecting the inlet section to the outlet section; at least one ultrasound device for transmitting and/or receiving ultrasound waves, wherein the ultrasound device is arranged at a wall of the measurement section; and an evaluation unit for carrying out a time of flight difference measurement and for determining the flow rate, wherein the inlet section has a first superelliptic transitional shape and the outlet section has a second superelliptic transitional shape and the measurement section has a rectangular form, in particular having rounded corners.

Abstract: A measuring apparatus (10) for determining the flow speed of a fluid (12) flowing in a conduit (14) using at least one ultrasonic transducer (18a-b) that is attached to the conduit wall (22) from the outside and has an oscillating body (34) that couples to a part region (32) of the conduit wall (22) that acts as a membrane of the ultrasonic transducer (18a-b) that can vibrate, characterized in that a coupling piece (36) whose cross-section is smaller than the cross-section of the oscillating body (34) is arranged between the membrane (32) and the oscillating body (34).