Krohne Ag

Other

Arie Huijzer

Jeroen Martin Van Klooster

Jan Teunis Aart Pors

Marcel Meijlom Molenaar

Cornelis Johannes Hogendoorn

Alexander Marnix Heijnsdijk

Jereon Martin Van Klooster

John C Visser

Jan Aart Van Bekkum

Willemjin Schipper

A method for operating an ultrasonic flowmeter includes: capturing at least one first ringing signal of a first ultrasonic transducer of the ultrasonic flowmeter, and detecting a first ringing debugging signal based on the at least one captured first ringing signal; emitting a first measurement signal into a medium through the first ultrasonic transducer, resulting in a first ringing measurement signal in the first ultrasonic transducer; receiving a measurement signal as a first received signal by the first ultrasonic transducer, wherein the first received signal and the first ringing measurement signal are superimposed to form a first superimposed signal; determining a first correction signal by subtracting the first ringing debugging signal from the first superposition signal; and determining the flow velocity or flow rate of the medium based on the first correction signal.

Method for operating an ultrasonic flowmeter and ultrasonic flowmeter

An ultrasonic flowmeter includes a measuring tube and first and second ultrasonic transducers. The first ultrasonic transducer is an ultrasonic transmitter and/or an ultrasonic receiver, and the second ultrasonic transducer is an ultrasonic transmitter and/or an ultrasonic receiver. The ultrasonic transducers are offset on the measuring tube such that the respective transmitter transmits an ultrasonic signal in the direction of flow or against the direction of flow, and the receiver receives the ultrasonic signal after at least three reflections. A course of the ultrasonic signal defines a signal path with first and second signal path sections. The number of sub-sections of the first signal path section corresponds to the number of sub-sections of the second signal path section. The signal path in the first signal path section has a first direction of rotation, and the signal path in the second signal path section has an opposite, second direction of rotation.

Ultrasonic flowmeter

An Ultrasonic flowmeter for measuring the flow of a medium through a measuring tube () with at least two ultrasonic transducers () and at least one control and evaluation unit (). The measuring tube () has an inner wall, the ultrasonic transducers () are transmitters () for transmitting an ultrasonic signal () and/or are receivers () for receiving the ultrasonic signal, and are arranged offset in the direction of flow such that the respective transmitter () transmits an ultrasonic signal () in the direction of flow or against the direction of flow during operation. The receiver () receives the ultrasonic signal () transmitted by the transmitter () after at least one reflection on the inner wall of the measuring tube (), the ultrasonic signal () having a first signal component () and at least a second signal component ().

Ultrasound flowmeter and method for measuring flow rate

An ultrasonic flowmeter is provided with at least one measuring tube having at least one recess. Disposed in the recess are at least a first ultrasonic transducer and a second ultrasonic transducer, wherein the first ultrasonic transducer is designed as an ultrasonic transmitter and/or as an ultrasonic receiver and the second ultrasonic transducer is designed as an ultrasonic transmitter and/or as an ultrasonic receiver. Further disposed in the recess is at least one reflection surface. The first and second ultrasonic transducers are arranged on the measuring tube such that the measuring path between the first and the second ultrasonic transducers comprises at least one reflection at the reflecting surface. The provision of the reflection surface in the recess provides an ultrasonic flowmeter with which the flow profile can be easily measured, especially in the edge region.

An ultrasonic transducer for an ultrasonic flow meter, with a transducer housing, with a transducer element for generating and/or for receiving ultrasonic signals and with an emitting element, the emitting element being exposed to ultrasonic signals at least indirectly from the transducer element and emitting the ultrasonic signals via one end face on one front side of the emitting element into the vicinity bordering the ultrasonic transducer and/or the emitting element picking up ultrasonic signals from the vicinity via one end face on one front side of the emitting element and transmitting them at least indirectly to the transducer element. A good directional action in spite of small dimensions is achieved by the emitting element being connected to the transducer housing via a connecting element and being free standing on its periphery on the front side such that it can oscillate freely on the periphery.

Ultrasonic transducer with emitting element

An ultrasonic transducer for mounting in an ultrasonic flowmeter for measuring the flow has an electromechanical transducer element for generating ultrasonic signals, a carrier and a housing, the electromechanical transducer element being arranged in the carrier, the housing being formed at least in part of an electroconductive material, the carrier having a carrier material with an acoustic impedance value that lies between the acoustic impedance value of the electromechanical transducer element and the acoustic impedance value of the flowing medium to be measured. To provide an ultrasonic transducer that transmits a high signal portion of the ultrasonic signal into the medium to be measured and simultaneously provides a high operational reliability while being easy to build, the carrier is electroconductive, the carrier and the housing are electroconductively connected to one another and the electromechanical transducer element and the carrier are electroconductively connected to one another.

Ultrasonic transducer

An ultrasonic transducer as an important part of an ultrasonic flow meter is described, with a transducer housing and with a transducer element, the transducer housing having an ultrasound window and a housing tube, the transducer element being made for sending or receiving ultrasonic waves and being either near the ultrasound window of the transducer housing or away from the ultrasound window of the transducer housing, there being a relatively soft mechanical coupling system and the mechanical coupling system having preferably at least one weakly coupled mechanical resonator. The ultrasonic transducer is improved with respect to the prevention of the transmission of housing waves by there being a second soft mechanical coupling system.

An ultrasonic transducer and a transducer holder for preventing the transmission of housing waves has a decoupling ring between a housing flange of a transducer housing and a holder flange of the transducer holder. Preferably, there is a gasket between the housing flange of the transducer housing and the decoupling ring in addition to a gasket between the decoupling ring and the holder flange of the transducer holder.

Unit consisting of an ultrasonic transducer and a transducer holder

An ultrasonic transducer has a transducer housing having an ultrasound window, a housing tube and a housing flange, a transducer holder for holding the transducer housing, a transducer element with an ultrasonic flow rate measuring transducer that is positioned at an end of the housing tube of the transducer, and an opposing flange clamping the housing flange of the transducer housing to a holder flange of the transducer holder together with retraining screws and lock nuts. A side of the housing flange of the transducer housing facing the opposing flange has an outer contour which enables bracing of the opposing flange against the housing flange without tilting or bending of the housing flange.

An ultrasonic transducer for installation in an instrument housing, the ultrasonic transducer having a transducer housing and a housing fixture, the transducer housing being put under pressure by a medium in its installed state on its emitting and/or receiving side. To provide an ultrasonic transducer for installation in an instrument housing, which implements a measure for avoiding crosstalk of ultrasonic signals and avoids the disadvantages known from the prior art&#x2014;at least partially, the ultrasonic transducer is wherein the transducer housing indirectly forms at least one contact area in its installed state with the housing fixture, the transducer housing and the housing fixture being at least indirectly pressed against one another in a first contact area with existing, but as slight as possible, surface pressure by a pre-loading mechanism.

An ultrasonic flow rate measuring device for measuring the flow rate through a line through which a medium flows has at least one ultrasonic transducer that has a piezo element and a connecting element designed for attaching the ultrasonic transducer to the line with the piezo element attached to the connecting element. An intermediate layer including a plate is disposed between the piezo element and the connecting element that is electrically conductive and attachable to an electromagnetic shield. Thus, an ultrasonic flow rate measuring device that delivers a greater signal-to-noise ratio is achieved.

Ultrasonic flow rate measuring device

An ultrasonic flow rate measuring device, especially a clamp-on ultrasonic flow rate measuring device, with at least one ultrasonic transducer () for measuring the flow rate through a line through which a medium flows. The ultrasonic transducer () is located within an electromagnetic shielding arrangement (). Thus, an ultrasonic flow rate measuring device which delivers a good signal-to-noise ratio is achieved.

A transmitting and receiving circuitry system for an ultrasonic flowmeter includes an ultrasound transducer interface for connection to an ultrasound transducer of the ultrasonic flowmeter, an amplifier with a first input and a second input, as well as a signal generator for activating the ultrasound transducer, with the first input of the amplifier connecting to the signal generator while the second input of the amplifier connects both to the ultrasound transducer interface and, via a feedback element, to the output of the amplifier. The impedance of the feedback element can be varied, permitting an adaptation of the transmitting and receiving circuitry to the operating mode of the ultrasonic flowmeter, in particular an adaptation to a transmitting or receiving mode, whereby an overall improvement of the signal-to-noise ratio is attainable. A method for operating such a system is also disclosed.

Transmitting and receiving circuitry for an ultrasonic flowmeter, and method for operating such transmitting and receiving circuitry

An ultrasonic flow-measuring method measures the flow rate of a medium traveling through a measuring conduit by means of two ultrasound transducers which in the flow direction of the medium are offset relative to each other and both of which alternate in emitting ultrasonic pulses while the respective other ultrasound transducer receives the emitted ultrasonic pulses and the flow rate is determined as a function of the run times of the ultrasonic pulses received by the respective other ultrasound transducer. At least one correction parameter is established on the basis of the calculated sound propagation of the ultrasonic pulses traveling from one ultrasound transducer to the other, the calculation of the sound propagation of those pulses is made by taking into account a predefined frequency spectrum of the oscillations of the ultrasound transducers and the flow rate is calculated by applying the correction parameter established.

Ultrasonic flow-measuring method

A transmitting and/or receiving head for a sonic flowmeter measuring moving fluids by the runtime method, with an enclosure, an ultrasonic transducer transmitting ultrasound signals into and/or receiving ultrasound signals from the moving fluid and with an ultrasound waveguide by way of which the ultrasound signals are injected into and/or extracted from the moving fluid. The transmitting and/or receiving head is particularly well suited to utilization in a sonic flowmeter for very hot fluids, especially hot gases, by virtue of the fact that it employs an ultrasound waveguide in the form of an elongated sonic funnel offering high thermal conduction resistance.

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Sliedrecht, Netherlands

Arie Huijzer