Abstract: A method for operating an ultrasonic flowmeter includes the steps of: emitting a measuring signal having a first part that propagates as an interference signal along and/or within a wall of a measuring tube, and a second part that propagates as a useful signal through a medium flowing through the measuring tube; receiving the interference signal and the useful signal; determining an interference amplitude of the interference signal and determining a useful amplitude of the useful signal; determining an amplitude ratio of the useful amplitude and the interference amplitude; and providing a message if the amplitude ratio falls below a specified lower limit value or exceeds a specified upper limit value. A related ultrasonic flowmeter is also disclosed.

Abstract: An ultrasonic flowmeter includes first and second ultrasonic transducers and a control and evaluation unit. The first and second ultrasonic transducers include respective transducer housings that are at least partially capable of mechanical oscillation and are at least partially excited to mechanical oscillations for signal emission or signal coupling. The control and evaluation unit controls the first and second ultrasonic transducers and evaluates a measurement signal characterizing a flow rate of a medium. The first ultrasonic transducer has a mechanical oscillation influencing element that influences oscillation behavior of the first ultrasonic transducer such that natural frequencies of the first ultrasonic transducer are frequency-shifted relative to natural frequencies of the second ultrasonic transducer.

Abstract: 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.

Abstract: 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.

Abstract: 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.

Abstract: An Ultrasonic flowmeter for measuring the flow of a medium through a measuring tube (3) with at least two ultrasonic transducers (4,5) and at least one control and evaluation unit (6). The measuring tube (3) has an inner wall, the ultrasonic transducers (4, 5) are transmitters (4,5) for transmitting an ultrasonic signal (7) and/or are receivers (4, 5) for receiving the ultrasonic signal, and are arranged offset in the direction of flow such that the respective transmitter (4, 5) transmits an ultrasonic signal (7) in the direction of flow or against the direction of flow during operation. The receiver (4, 5) receives the ultrasonic signal (7) transmitted by the transmitter (4, 5) after at least one reflection on the inner wall of the measuring tube (3), the ultrasonic signal (7) having a first signal component (8) and at least a second signal component (9).

Abstract: 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.

Abstract: 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.

Abstract: 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.

Abstract: An Ultrasonic flowmeter for measuring the flow of a medium through a measuring tube (3) with at least two ultrasonic transducers (4,5) and at least one control and evaluation unit (6). The measuring tube (3) has an inner wall, the ultrasonic transducers (4, 5) are transmitters (4,5) for transmitting an ultrasonic signal (7) and/or are receivers (4, 5) for receiving the ultrasonic signal, and are arranged offset in the direction of flow such that the respective transmitter (4, 5) transmits an ultrasonic signal (7) in the direction of flow or against the direction of flow during operation. The receiver (4, 5) receives the ultrasonic signal (7) transmitted by the transmitter (4, 5) after at least one reflection on the inner wall of the measuring tube (3), the ultrasonic signal (7) having a first signal component (8) and at least a second signal component (9).

Abstract: 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.

Abstract: 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.

Abstract: 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.

Abstract: 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.

Abstract: 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.

Abstract: 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.

Abstract: 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.

Abstract: A matching network for matching the impedance of a load to an impedance of an electrical energy source has an output, an input, an inductance, a capacitance, and a series connection of a nonlinear impedance and the inductance or the capacitance. The series connection is connected in parallel to the output or parallel to the input.

Abstract: 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.

Abstract: 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.