Sick Engineering Gmbh

Sick Ag

Markus Klemm

Michael Overdick

Eric Starke

Christian Schulz

Mario Künzelmann

Trevor Stewart

Thomas Blümcke

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.

Throughflow measurement system

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. In order to provide an improved flowmeter with which a high measurement accuracy with good signal quality can be achieved using secant paths, it is proposed that the ultrasonic transducer units define at least two measurement paths between them, depending on the angle of the emitted ultrasonic signals, along which paths the ultrasonic signals pass from one to the other ultrasonic transducer unit, and that at least one of the measurement paths has at least one reflection on a conduit wall of the conduit and path sections are defined by the reflection or reflections.

Flowmeter

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 (), each of which consists of an array of individual ultrasonic transducers (--) and defining a measuring path () between them in the conduit (). 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 (), and the conduit wall () is formed in the area of the contact with a wall thickness (w) that is less than half the wavelength of the transverse wave (&#x3bb;) of the ultrasound in the conduit wall.

Ultrasonic flow measuring device having a wall thickness being less in the area of the phased array ultrasonic transducer contact area

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Ottendorf-Okrilla, Germany

Markus Klemm