Abstract: A device determines a propagation time of an acoustic signal through cross-correlation analysis between a transmission signal and a reception signal. The device generates the transmission signal to satisfy (1) a ratio of a height of a peak other than a maximum peak in an autocorrelation function of the transmission signal to a height of the maximum peak being 0.8 or less and (2) a duration of the transmission signal being at least five times a shortest period of the transmission signal or at least 20 times a half width at half maximum of the autocorrelation function of the transmission signal.

Abstract: A grain cleaning system for a combine harvester having a transmitter adapted to transmit a base signal at a known frequency and one or more spaced receivers for detecting signals of a different frequency as reflected from airborne grain and other materials within the duct of the grain cleaning system. An Electronic Control Unit modulates the base signal and the reflected signals to obtain Doppler signals or frequencies from which an average particle velocity is determined. The particle velocity is used as an input parameter for the generation of control signals for the adjustment of various working units of the combine harvester including, by way of example, the fan and sieves.

Abstract: A method of testing a sensing device with a sensing mass includes accelerating the sensing device along a circular path about a central axis. The sensing mass of the sensing device may be movable relative to the central axis. The method includes determining a position of the sensing mass of the sensing device via a sensor and shifting the sensing device radially relative to the central axis based at least in part on the position of the sensing mass during acceleration.

Abstract: To detect air in a fluid delivery line of an infusion system, infusion fluid is pumped through a fluid delivery line adjacent to at least one sensor. A signal is transmitted and received using the at least one sensor into and from the fluid delivery line. The at least one sensor is operated, using at least one processor, at a modified frequency which is different than a resonant frequency of the at least one sensor to reduce an amplitude of an output of the signal transmitted from the at least one sensor to a level which is lower than a saturation level of the analog-to-digital converter to avoid over-saturating the analog-to-digital converter. The signal received by the at least one sensor is converted from analog to digital using an analog-to-digital converter. The at least one processor determines whether air is in the fluid delivery line based on the converted digital signal.

Abstract: A compact ultrasonic flowmeter for measuring flowrate and other fluid related data includes a flow tube with a flow bore for passage of the fluid between an inlet and an outlet, a flowmeter housing associated with the flow tube, a printed circuit board arranged in the flowmeter housing and including a processor for controlling operations of the flowmeter, a meter circuit including ultrasonic transducers provided on the printed circuit board and configured for operating the ultrasonic transducers to transmit and receive ultrasonic wave packets through the fluid, a display mounted on the printed circuit board and configured for displaying a measured flowrate and the other fluid related data, one or more battery packs for powering flowmeter operations, and an antenna element configured to be connected to a radio circuit via connectors provided on the printed circuit board and/or the antenna element.

Abstract: The present disclosure relates to a coupling member (20) for a flow metering device, the coupling member (20) being configured for acoustically coupling an ultrasonic transducer (26) to a fluid conduit (90), wherein the coupling member comprises a first face (22) adapted to be connected to an ultrasonic transducer (26) and a second face (24) adapted to be connected to a fluid conduit. At least one sidewall (30) connects the first and second faces (22, 24), wherein the at least one sidewall (30) comprises a recess (40) extending from the second face (24).

Abstract: A monitoring device of liquid pipeline includes a fixture detachably fixed to an outer surface of a pipeline, a first ultrasonic probe disposed in the fixture, a processing module having stored a minimum signal threshold, and a display unit connecting to the processing module. The processing module controls the first ultrasonic probe transmitting a first sensing signal and receiving a first reflection signal corresponding to the first sensing signal along a radial direction of the pipeline, and analyzes signal of first period and second period signal from the first reflection signal. If the processing module determines that the signal of first period signal is greater than and the signal of second period signal less than the minimum signal threshold, the processing module generates a warning signal that represents abnormality of the first ultrasonic probe or liquid in the pipeline. The display unit displays the warning signal.

Abstract: A covering structure disposed within a sound producing package includes a first portion, a second portion and a third portion. The first portion is configured to form a first sound outlet having a first diameter. The second portion is configured to form a chamber having a second diameter. The third portion is configured to form a second sound outlet having a third diameter. Wherein, the first sound outlet, the chamber and the second sound outlet provide an acoustic pathway, the first diameter is smaller than the second diameter, and the third diameter is smaller than the second diameter; and wherein, the second portion is disposed between the first portion and the third portion.

Abstract: An ultrasonic transducer arrangement for a clamp-on ultrasonic, flow measuring point includes a plurality of ultrasonic transducers, each adapted to radiate ultrasonic signals into the measuring tube and/or to receive ultrasonic signals emerging from the measuring tube, wherein a first group of first ultrasonic transducers is arranged on a first side of the measuring tube, and a second group of second ultrasonic transducer is arranged on a second side of the measuring tube opposite the first side, wherein at least one first/second ultrasonic transducer is adapted to receive ultrasonic signals of at least one second/first ultrasonic transducer, respectively, wherein adjoining ultrasonic transducers of the first group have, in each case, first separations from one another, and wherein adjoining ultrasonic transducers of the second group have, in each case, second separations from one another.

Abstract: A flow meter for measuring the flow rate or volume of a fluid includes a flow tube shaped to define an internal passageway through which the fluid travels, a set of transducers coupled to the flow tube in fluid communication with the internal passageway, and a core module coupled to the flow tube. The core module comprises a cup-shaped enclosure shaped to define an interior cavity and a top cover mounted on the enclosure to enclose the interior cavity. A disc-shaped partition separates the interior cavity into an upper compartment which receives a printed circuit board assembly and a lower compartment which receives a power supply assembly and a connector assembly. Separating the interior cavity into distinct compartments allows for different waterproofing techniques to be utilized based on the sensitivity and lifespan differential between the various electrical components, thereby minimizing the use of potting material and facilitating component replacement.

Abstract: A flow machine having a flow passage and an air flow measurement system comprising a plurality of acoustic sensors. The acoustic sensors comprise at least one acoustic transmitter configured to transmit an acoustic waveform through the airflow passing through the flow passage to an acoustic receiver. At least one of the acoustic sensors is rotatable relative to one or more other acoustic sensor.

Abstract: A measuring device for determining the flow rate of a fluid which flows through a pipe portion. The measuring device comprises a measuring pipe with a pipe wall, at least one ultrasonic sensor for transmitting an acoustic signal and/or receiving an acoustic signal having an ultrasonic sensor upper surface and a holding element. In the pipe wall, at least one opening of a first type is provided, into which the at least one ultrasonic sensor can be inserted, and wherein the measuring device has an assembled state in which the holding element surrounds the measuring pipe in an annular manner and is positioned on the at least one ultrasonic sensor inserted into the opening of a first type.

Abstract: Methods, systems, and apparatus, including computer programs encoded on a computer storage medium, for monitoring slug flow in subterranean wells. In one aspect, a method includes at a time instant, transmitting an acoustic signal across a cross-section of a pipeline flowing multiphase fluid including gaseous fluid and liquid fluid, wherein a portion of the acoustic signal is carried through the cross-section of the pipeline by the multiphase fluid and determining, at the time instant, a first quantity of the gaseous fluid and a second quantity of the liquid fluid passing the cross-section of the pipeline based, in part, on an energy of the portion of the acoustic signal carried through the cross-section and at least a portion of a total energy of the transmitted acoustic signal.

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: An ultrasonic flowmeter includes flow path that has a rectangular cross section and through which a fluid to be measured flows, and partition plate that divides flow path into measurement flow path and non-measurement flow paths. In addition, the ultrasonic flowmeter includes a pair of ultrasonic sensors that are arranged upstream and downstream of a surface forming flow path and transmitting and receiving ultrasonic signals, and a flow rate calculator that detects a flow rate of the fluid to be measured based on a propagation time. The ultrasonic flowmeter includes openings that connect measurement flow path, non-measurement flow paths, and a space where the ultrasonic sensors is located, and the ultrasonic sensors mainly propagate ultrasonic waves only to measurement flow path through openings.

Abstract: A flow sensor sub-assembly for sensing flow of a fluidic medicament including a flow tube assembly through which said medicament flows, the flow tube assembly having: a flow tube having a lumen; an inlet fitting; and an outlet fitting; a first transducer arranged at the inlet fitting; and a second transducer arranged at the outlet fitting, wherein a transducer adhesive bonds said first transducer to the inlet fitting and said second transducer to the outlet fitting, and wherein the transducer adhesive dampens at least one of out of phase vibrations and rogue vibrations induced in the inlet and outlet fittings by transmission of sound energy between the first and second transducers and the inlet and outlet fittings.

Abstract: A method operates a measuring device used to determine a fluid variable. The measuring devices contains a vibration transducer driven to excite a wave in the fluid due to a test excitation signal. The wave is guided along a propagation path back to the vibration transducer or to an additional vibration transducer, thereby exciting the (additional) vibration transducer to vibrate. An output signal relating to this vibration is acquired, and a frequency of that segment of the output signal that lies in an analysis interval is determined. The analysis interval starts once the driving of the vibration transducer to excite the wave has finished, and/or once a maximum of the amplitude of the vibration is reached. The determination of the fluid variable is performed based on the determined frequency. An error message or a notification is output to a user and/or to a device external to the measuring device.

Abstract: A piezoelectric cell support for an ultrasonic transducer, the support including a front face having formed thereon: a first shoulder that defines a bearing surface and a bottom of a central cavity surrounded by the bearing surface, the bearing surface being suitable for having a piezoelectric cell placed thereon; retention device(s) for holding the piezoelectric cell on the bearing surface and for positioning it angularly; and a rear face having a sloping surface that gives a top portion of the support a first thickness that is less than a second thickness of a bottom portion of the support.

Abstract: Ringdown noise can be estimated and removed from a waveform captured by a downhole tool. Ringdown may be estimated by calculating a median of waveforms from a number of tool firings. The estimated ringdown may then be subtracted from a waveform currently being processed. The resulting waveform contains a more accurate representation of a true echo signal reflected from the borehole wall or formation. In some embodiments, the acoustic transducer's deterministic waveform may be learned by statistical analysis of other waveforms near in time to the presently measured waveform. In other embodiments, the deterministic waveform may be learned via previously acquired waveforms now stored in memory, or through predictive waveforms developed in laboratory testing conditions similar to those experienced downhole.

Abstract: A method and system for measuring a time of flight can involve correlating a signal comprising a reflected signal from a first transducer to a second transducer, or a subsequent reflected signal at the first transducer or the second transducer, with a previously received signal to produce a correlation for a measurement of a time of flight. The signal(s) can include one or more of a pulse train, acoustic sound; ultrasonic sound; or light, and the previously received signal can be a signal that has been reflected one or more times.

Abstract: A flow control device (1) for an HVAC fluid transportation system comprises a flow tube (10) formed in one piece, a flow measurement system (11) integrated with the flow tube (10) and configured to measure a volumetric flow of fluid (?) through the flow tube (10), and an electronic circuit (12) arranged in a fixed fashion on the flow tube (10) and connected electrically to the flow measurement system (11). The flow control device (1) further comprises a control signal output terminal (13) attached to the flow tube (10) and connected to the electronic circuit (12). The electronic circuit (12) is configured to generate and apply on the control signal output terminal (13) an actuator control signal, using the volumetric flow of fluid (?) measured by the flow measurement system (11), for an actuator actuating a valve of the HVAC fluid transportation system (2) arranged outside the flow tube (10) of the flow control device (1).

Abstract: A sensor using ultrasound to detect presence and nature of analyte includes an ultrasonic element and a receptor thereon. The ultrasonic element includes a first electrode, a second electrode facing and spaced apart from the first electrode, an insulating layer between the first electrode and the second electrode, and a vibrating film between the insulating layer and the first electrode. The vibrating film carries the first electrode. A cavity is formed between the vibrating film and the insulating layer. The receptor is on a side of the first electrode away from the second electrode. The receptor can combine with a target substance in a test analyte. When the first electrode and the second electrode are applied with different voltages, certain ultrasound frequencies are generated as the vibrating film vibrates, and the presence and weight of different target substances are indicated by the changes in resonance.

Abstract: A method of measuring the speed of a fluid comprising the following steps: generating a plurality of pseudorandom frequencies (fus_n); for each pseudorandom frequency (fus_n), emitting ultrasound signals into the fluid to travel along a path of defined length; receiving the ultrasound signals; for each received ultrasound signal, producing a travel time measurement, so as to generate for each pseudorandom frequency (fus_n) a predefined number of travel time measurements; for each pseudorandom frequency (fus_n), evaluating the accuracy of the measurements; for evaluating the speed of the fluid, making use of the measurements produced for the pseudorandom frequency that presents the greatest accuracy.

Abstract: A device for measuring the mass flow rate, including a flow pipe; a first set of actuators which are arranged in a first plane including a first transverse cross section of the pipe and perpendicular to the fluid flow path, these being configured to move selectively in the first plane; a control circuit configured to control a movement of the first and second actuators so that the cross-sectional area for flow through the pipe in the first plane remains constant; a measurement sensor measuring a force or a stress in a direction perpendicular to the flow path, in the vicinity of the actuators of the first set along the flow path; a computation device configured to calculate the mass flow rate passing through the flow pipe as a function of the force or stress measured by the sensor.

Abstract: A flow meter for calculating fluid flow rate and/or volume includes a flow cell shaped to define an internal passageway through which the fluid travels, and four separate transducer assemblies independently mounted within mounts in the flow cell in fluid communication with the internal passageway. Each transducer assembly includes a transducer, a transducer stud with a recess in its front surface that is dimensioned to receive the transducer, and a sensor plate mounted onto the stud for retaining the transducer in the recess. A bore extends vertically through the transducer stud and into communication with the recess, the bore being dimensioned to receive wiring for the transducer. The separation and independent mounting of the four transducer assemblies in the flow cell minimizes the disruption of normal fluid flow through the internal passageway, thereby enabling greater accuracy of measurements to be achieved.

Abstract: A system for measuring a velocity or volumetric fluid flow rate of a fluid flow passing within a pipe includes a SONAR flow meter configured to determine a measured velocity or volumetric rate of a fluid flow passing within a pipe. The system further includes a CFD analysis device configured to produce a simulated velocity or volumetric rate of the fluid flow passing within the pipe. The system further includes a processing unit in communication with the CFD analysis device and the SONAR flow meter. The processing unit is configured to produce at least one error function based on the measured velocity or volumetric fluid flow rate and the simulated velocity or volumetric fluid flow rate, and is configured to determine an adjusted velocity or volumetric fluid flow rate using the at least one error function and the measured velocity or volumetric fluid flow rate.

Abstract: Weld seam testing chain for testing a weld seam by means of ultrasound on two plastic tubes welded together at the ends, comprising standard chain links, wherein the standard chain links are hooked together to form the weld seam testing chain, and the chain can be lengthened or shortened individually, a sensor receptacle for accommodating the ultrasonic sensor, and an adjusting unit for the fine adjustment of the weld seam testing chain length, wherein the standard chain links have a hook on one side and a hook receptacle on the opposite side, thereby enabling the individual chain links to be hooked together.

Abstract: Integrated flow meter and control valve (1) including a flow tube (11); a substantially watertight meter housing (12) providing a compartment (121), extending from the flow tube; a metering unit (139 arranged inside the compartment for measuring the flow of a medium flowing though the flow channel, and an electrical valve actuator (18) arranged inside the compartment and adapted to control a flow control element (19) arranged inside the flow channel, wherein that meter housing is formed as an integrated part of the flow tube with the compartment having a primary opening (124) for insertion of the metering unit and a secondary sealable opening (125) for insertion of the electrical valve actuator.

Abstract: A fluid meter has a housing comprising a flow channel for fluid to be measured and at least one elongate module-receiving opening forming a passage from an outer surface of the housing to the flow channel. At least one fluid-measuring module, prefabricated separately, from the housing with a base section formed as a waveguide for surface acoustic waves, and at least one signal transformer to excite surface acoustic waves in the waveguide and/or receive surface acoustic waves from the waveguide is provided. When inserted into the module-receiving opening, the base section of the fluid-measuring module forms part of the flow channel inner wall and contacts fluid flowing through it. Surface acoustic waves emitted by the signal transformer can be coupled out of the waveguide and can propagate through fluid in the flow channel as bulk acoustic waves and/or bulk acoustic waves can be coupled into the waveguide and received by the signal transformer.

Abstract: A flow meter includes at least two spaced-apart measuring sensors, preferably ultrasonic sensors, wherein the coupling in and out of the measurement signals in or out of a fluid occurs via a coupling part which is inserted into a circumferential wall of a measuring channel produced via hydroforming. Alternatively, the coupling in and out of the measurement signals can also occur through a wall of the measuring channel.

Abstract: A method for measuring a velocity of a fluid, comprising the steps of, acquiring an ultrasonic measuring signal after it has travelled in the fluid over a path of defined length; defining measurement zone of the ultrasonic measuring signal which includes a plurality of measurement lobes; for each measurement lobe, measuring a zero crossing point associated with said measurement lobe; selecting at least two zero crossing points which satisfy a predefined precision criterion; estimating a time of flight for the ultrasonic measuring signal from the selected zero crossing points; utilizing the time of flight to estimate the velocity of the fluid.

Abstract: The invention provides a gas flow metering gas chamber and a gas flow meter. The gas flow meter includes the gas flow metering gas chamber, a display device and a housing. The gas flow meter gas cell includes a cavity, a gas inlet, a gas outlet, two ultrasonic transducer mounting holes and a reflection device. The signal emitted by the first ultrasonic transducer installed in the first ultrasonic transducer mounting hole and the signal emitted by the second ultrasonic transducer installed in the second ultrasonic transducer mounting hole intersects with each other to form an L-shaped reflection passage. Compared with V-shaped, W-shaped, and N-shaped reflection structures, the effective distance between the two ultrasonic transducers of the present invention more is increased, the cross section of the cavity is reduced, and the rate of the gas flow is increased, which avoids contamination contained in the measured gas to contaminate the ultrasonic transducers and thereby improves the measurement accuracy.

Abstract: An ultrasonic measuring includes a housing having a measuring channel and ultrasonic transducers. The housing is releasable attached to a pipe such that the measuring channel is capable of receiving the pipe and fixing the pipe with respect to the housing. The ultrasonic transducers emit and receive ultrasonic signals, and include first and second ultrasonic transducers. The first ultrasonic transducers define a first measuring section so as to be capable of exchanging ultrasonic signals, and the second ultrasonic transducers define a second measuring section so as to be capable of exchanging ultrasonic signals. The ultrasonic transducers are aligned such that the first and second measuring sections extend obliquely to a flow direction, and such that a measuring plane is defined by a center axis of the measuring channel and is different from a measuring plane defined by the center axis of the measuring channel and the second measuring section.

Abstract: A flow sensor sub-assembly includes a flow tube having a lumen, an outside diameter, a first end, and a second end. An inlet fitting includes a conical orifice sized for insertion in either end of the flow tube, such that an internal passage of the inlet fitting is coaxial and concentric with the lumen and the end of the flow tube abuts a shoulder. An outlet fitting includes a conical orifice sized for insertion in either end of the flow tube, such that an internal passage of the inlet fitting is coaxial and concentric with the lumen and the end of the flow tube abuts a shoulder. A first piezo element integrated with the inlet fitting is arranged at an upstream position of the flow tube assembly and a second piezo element integrated with the outlet fitting is arranged at a downstream position of the flow tube assembly.

Abstract: An ultrasound flow measurement apparatus (10) for determining the flow rate of a fluid flowing in a line (12) is provided having at least one measurement path (18) at which a first ultrasonic transducer (16a) and a second ultrasonic transducer (16b) are arranged opposite one another with the flowing fluid between them, and having an evaluation unit that is configured to calculate the flow rate from a time of flight difference of ultrasonic pulses along the measurement path (18) in the direction with the flow (14) and against the flow (14). The ultrasonic transducers (16a-b) here are positioned such that a specific part pulse is isolated in time in a received signal of the respective receiving ultrasonic transducer (16a-b), with the part pulse corresponding to a direct sound, a reflected sound, an axially broken fluid sound, or an azimuthally broken fluid sound.

Abstract: Fluid meter with a fluid housing and a method for manufacturing the fluid housing, which comprises a fluid inlet, a fluid outlet and a fluid channel, which extends between the fluid inlet and the fluid outlet and which is fluidically coupled to the fluid inlet and the fluid outlet, wherein the fluid housing has a side facing the fluid channel, to which a fluid-measuring module is assigned, which is in direct contact with a fluid flowing through the fluid channel at a fluid-side interface, wherein the fluid-measuring module is surrounded by the fluid housing, and wherein the fluid-measuring module is equipped to generate surface acoustic waves which propagate along the fluid-side interface of the fluid-measuring module.

Abstract: The subject matter of this specification can be embodied in, among other things, a method of sensing that includes activating a first emitter to emit at least one incident wave, transmitting the incident wave along a buffer rod having a first axial end abutted to the first emitter and a second axial end opposite the first axial end, reflecting a first echo of the incident wave by a gap defined along a portion of the buffer rod, detecting the first echo, determining a first amplitude of the first echo, reflecting a second echo of the incident wave by the second axial end, detecting the second echo, determining a second amplitude of the second echo, and determining a reflection coefficient based on the first amplitude and the second amplitude.

Abstract: A method for measuring a speed of a fluid, comprising measurement phases and detection phases each carried out between two measurement phases, each detection phase comprising the steps of; measuring a spurious ultrasonic signal level; comparing the spurious ultrasonic signal level with a detection threshold capable of assuming a plurality of predefined values; if the measured spurious ultrasonic signal level is less than the detection threshold, reducing the detection threshold, and repeating the measurement step and the comparison step; when the measured spurious ultrasonic signal level becomes greater than or equal to the detection threshold, detecting a disturbance and, depending on the value of the detection threshold, determining if the disturbance originates from an anomaly or from attempted fraudulent activity.

Abstract: A circuit includes a filter, a first inverter, and a second inverter. The filter is coupled to an input of the first inverter. The second inverter includes an input and an output. The input of the second inverter is coupled to the output of the first inverter. The output of the second inverter is coupled to the input of the first inverter.

Abstract: A computer program product includes program instructions executable by a processor to perform various operations. The operations include obtaining data from a flow meter having ultrasonic transducer pairs arranged about a conduit to establish measurement paths, wherein the flow meter data includes ultrasonic pulse transmission and detection data from first and second ultrasonic transducers for each path included in a set of the paths. The operations further comprise determining a first flow rate using the data for each path in the set of the paths, determining a second flow rate using the data for each path in a subset of the paths, wherein the subset of the paths includes fewer paths than in the set of the paths and only paths included in the set of the paths, and determining whether a difference between the first flow rate and the second flow rate is greater than a difference setpoint.

Abstract: A computer-implemented method for visualizing uncertainty in flow measurements is provided. A non-limiting exemplary method includes reading, by a processor, a plurality of fluid flow measurements having a magnitude, a direction, and a location. The method plots a plurality of points on a first polar graph, each point representing the difference in fluid flow measurements between two of the plurality of fluid flow measurements at different locations and calculates an uncertainty boundary line based on the plurality of plotted points. The method filters, by the processor, the plurality of plotted points to remove plotted points outside of the uncertainty boundary line leaving only remaining plotted points and defines at least one cluster of remaining plotted points based on similar behavior of a subset of the remaining plotted points. The method may use the remaining plotted points to provide adaptive setup to tune a response in the fluid flow measurements.

Abstract: The present disclosure relates to a clamp-on ultrasonic sensor for an ultrasonic flow rate measuring device and to an ultrasonic flow rate measuring device comprising at least one clamp-on ultrasonic sensor according to the present disclosure. The clamp-on ultrasonic sensor is designed to generate at least one lamb wave mode in a measuring tube wall of a measuring tube of the ultrasonic flow rate measuring device. To ensure the use of the clamp-on ultrasonic sensor on different types of measuring tubes, the clamp-on ultrasonic sensor comprises a coupling element, which coupling element is adapted to a respective type of measuring tube.

Abstract: An ultrasonic meter for recording a flow quantity dependent on a flow of a fluid, has a control device, a measuring tube having a plurality of side walls, mutually adjacent side walls being at an angle to one another, and through which the fluid can flow in a longitudinal direction of the measuring tube, and first and second ultrasound transducers which are arranged at a distance from one another in the longitudinal direction on the measuring tube. The first and second ultrasound transducers respectively contain one transducer element or a predetermined arrangement of a plurality of transducer elements. The ultrasound transducer can be driven by the control device in order to excite an acoustic wave conducted in a side wall of the measuring tube, and conducted through the fluid to the other ultrasound transducer and recorded there by the control device to determine a signal time of flight.

Abstract: A self-checking ultrasonic flow meter for measuring fluid flow in a conduit which includes a plurality of transducers engaged with the conduit. The flow meter includes a signal processor in electrical communication with the transducers which produces a measurement of flow rate and an associated estimate of uncertainty due to changes that have affected the accuracy of the measured flow rate. The transducers form multiple transducer pairs positioned to form acoustic transmission paths that are co-located in two or more chordal measurement planes. A plurality of axial velocity measurements are made in each chordal plane. A method for measuring fluid flow in a conduit with an ultrasonic flow meter.

Abstract: Method for measuring a speed of a fluid, implemented by an ultrasonic flow meter including a reflector mirror positioned between two transducers. The measuring method includes measurement phases in which: one of the two transducers emits an ultrasonic measurement signal; the other of the two transducers receives the ultrasonic measurement signal after it has completed a measurement trip; evaluate the speed of the fluid depending on a measurement trip time. The measurement method furthermore includes compensation phases in which: one of the two transducers emits an ultrasonic compensation signal; the transducer receives the ultrasonic compensation signal after it has completed a compensation trip during which it was reflected by the reflector mirror; compensate for a measurement drift of the transducer by adjusting the measurement trip time depending on a compensation trip time.

Abstract: A method determines a fluid quantity relating to a fluid flowing in a measuring device. The measuring device has a measuring tube which receives the fluid, and first and second oscillation transducers. An excitation of a total wave, which is conducted through a wall of the measuring tube, by the first and/or second oscillation transducer, by wave components which are conducted in the wall being excited by the oscillation transducers in a plurality of excitation regions. These wave components are superposed to form the total wave. A distance between the centers of the excitation regions and the excitation frequency are selected such that an oscillation mode to be attenuated is quenched by destructive interference of the wave components in a propagation direction. Excitation of a compression oscillation of the fluid by the total wave occurs. Measurement data relating to the compression oscillation is used to determine the fluid quantity.

Abstract: To improve installation work on piping for a clamp-on type ultrasonic flowmeter including a damping member. A damping member is provided in a state of being in contact with piping, and the damping member is a sheet-shaped molded article which has moderate flexibility and a predetermined thickness. In addition, the damping member has viscoelasticity and has adhesion and peelability to the metal piping. The damping member is fixed to the piping by a damping fixture surrounding an outer periphery of the damping member, and the damping member is pressed against the piping by the damping fixture. A flow sensor body is fixed on the damping member.

Abstract: A method for operating a measuring device determining a fluid quantity relating to fluid or fluid flow uses a measuring tube receiving the fluid or conducting the flow and oscillation transducers spaced along the tube. A first flight time is recorded, then an ultrasound signal excited by a first transducer, after travel on a propagation path including only components of the measuring device to a second transducer, is recorded at a second transducer. A second flight time is recorded, then an ultrasound signal excited by the second transducer, after travel on the propagation path to the first transducer, is recorded at the first transducer. Then fulfillment of a report condition depending on a difference between flight times is checked. Upon fulfillment, a report is output to a user or a report message is sent to an external device or a correction parameter for determining the fluid quantity is adapted.

Abstract: A method of reducing a phase error of a flow rate measurement in an ultrasonic flow meter is disclosed. The flow meter has a flow path for a fluid to be measured, a first ultrasonic transducer having a characteristic quantity and a second ultrasonic transducer having a second characteristic quantity. The method comprises repeatedly measuring the first and second characteristic quantities of the ultrasonic transducers and determining a relation between the characteristic quantities, estimating a phase error value indicative of the phase error from the determined relation between the characteristic quantities, and using the estimated phase error value for correcting a difference between transmission times measured by the ultrasonic flow meter. An output is provided indicative of the flow rate of the fluid in the flow path with reduced phase error from the corrected difference between transmission times.

Abstract: The present invention provides a new and unique apparatus featuring a signal processor or processing module configured to: receive signaling containing information about a fluid flow passing through a pipe that is channelized causing flow variations in the fluid flow; and determine corresponding signaling containing information about a fluid flow characteristic of the fluid flow that depends on the flow variations caused in the fluid flow channelized, based upon the signaling received. The signal processor or processing module may be configured to provide the corresponding signaling, including where the corresponding signaling contains information about the fluid flow characteristic of the fluid flow channelized.