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Transit time of acoustic waves

Subclass of:

073 - Measuring and testing

073861000 - VOLUME OR RATE OF FLOW

073861180 - By measuring vibrations or acoustic energy

Patent class list (only not empty are listed)

Deeper subclasses:

Class / Patent application numberDescriptionNumber of patent applications / Date published
073861280 Transmitted along single path 52
073861310 Transmitted along parallel paths 3
20110277558ULTRASOUND MEASUREMENT OF THE FLOW SPEED OF A FLUID IN A CONDUIT - An ultrasound measurement apparatus (11-17-2011
20100229654METHOD AND SYSTEM FOR MULTI-PATH ULTRASONIC FLOW RATE MEASUREMENT - In one embodiment, a multi-path ultrasonic flow meter for determining the flow rate of a fluid in a conduit is disclosed comprising at least two transducer pairs attached to the conduit at two chord locations, one greater than and one less than a mid-radius chord, wherein the composite ratio the two path velocities to the flow rate is substantially constant over the range of Reynolds numbers. In another embodiment, a method of determining the flow rate of a fluid in a conduit is disclosed comprising the steps of determining a composite velocity by determining a weighted average of a plurality of path velocities, determining a chord velocity ratio based on the path velocities, determining a profile correction factor based on the composite velocity and the chord velocity ratio, and determining the flow rate based on the composite velocity and the profile correction factor.09-16-2010
20080196511ULTRASONIC FLOW METER - The invention relates to a flow cell for an ultrasonic flow meter comprising two transducers of ultrasonic waves wherein the two transducers are reversibly detachable from the flow cell. The flow cell with the transducers detached is sterilisable and is particularly suitable for use in disposable or single-use systems.08-21-2008
Entries
DocumentTitleDate
20090158858METHOD FOR QUANTIFYING VARYING PROPAGATION CHARACTERISTICS OF NORMAL INCIDENT ULTRASONIC SIGNALS AS USED IN CORRELATION BASED FLOW MEASUREMENT - According to the present invention, a method is provided for sensing a fluid flow within a pipe having a lengthwise axis to determine a parameter of the fluid flow. The method includes the following steps: a) providing an array of more than two ultrasonic sensors, each sensor having a transmitter and a receiver; b) disposing the transmitter and receiver of each sensor orthogonally relative to the lengthwise axis of the pipe; c) receiving ultrasonic signals using the receivers, which received signals result from initial signals transmitted from the transmitters of the ultrasonic sensors; d) processing the received signals from each sensor by projecting the received signals against a sine function and a cosine function, high pass filtering the projected signals, and using the high pass filtered projections to create an arrival vector within a complex plane, wherein the high pass filtered arrival vector is a rectified frequency doubled signal; and e) determining the parameter of the fluid flow using the arrival vector.06-25-2009
20100005902ULTRASONIC FLUID MEASURING DEVICE - An ultrasonic fluid measuring device capable of improving a measuring accuracy is provided. An ultrasonic fluid measuring device 01-14-2010
20100005901METHOD AND SYSTEM OF COORDINATION OF MEASUREMENT SUBSYSTEMS OF A FLOW METER - Coordination of measurement subsystems of a flow meter. At least some of the illustrative embodiments are flow meters comprising a spool piece that defines a central passage, a first plurality of transducer pairs mechanically coupled to the spool piece, a first control electronics electrically coupled to the first plurality of transducer pairs (the first control electronics configured to selectively activate each transducer pair of the first plurality of transducer pairs), a second plurality of transducer pairs mechanically coupled to the spool piece, a second control electronics different than the first control electronics (the second control electronics electrically coupled to the second plurality of transducer pairs, the second control electronics configured to selectively activate each transducer pair of the second plurality of transducer pairs). The first and second control electronics communicatively coupled and configured to coordinate activation of their respective transducer pairs.01-14-2010
20130061688Fluid Flow Monitor - There are disclosed methods and apparatus for monitoring fluid flow along a conduit such as a well bore or a pipeline. A sensor optical fibre is disposed along the conduit, and an optical interrogator is used to launch probe light pulses into the fibre and to determine optical properties of probe light backscattered within the fibre, the properties being indicative of vibration as a function along the fibre. An analyser is used to detect one or more vibration features moving along the conduit and to determine a measure of fluid flow based on the detected movement.03-14-2013
20110132102Measuring System for Determining and/or Monitoring Flow of a Measured Medium Through a Measuring Tube - Measuring system for determining and/or monitoring flow of a measured medium through a measuring tube, including: At least one ultrasonic transducer; and at least one control/evaluation unit, which, on the basis of measurement signals or on the basis of measurement data derived from the measurement signals, ascertains volume- and/or mass-flow of the medium flowing in the measuring tube; wherein the ultrasonic transducer has at least one electromechanical transducer element, which sends and/or receives ultrasonic signals; and at least one coupling layer in the region between electromechanical transducer element and measured medium, which coupling layer conducts the ultrasonic signals, and which ultrasonic transducer is acoustically coupleable with the measuring tube and at least partially fittable on the outer shape of the measuring tube and which electromechanical transducer element is flexible.06-09-2011
20080271543Ultrasonic Flow Rate Meter Having a Pressure Sensor - An ultrasonic flow rate meter and a method for measuring the flow rate with the aid of ultrasound are described, having at least two ultrasonic transducers situated offset in a flow channel in the flow direction for transmitting and receiving ultrasound wave packets, so that ultrasound propagation times from one of the ultrasonic transducers to the other, and vice-versa, can be determined in an electronic part, and having a pressure sensor associated with the flow channel for determining the pressure in the flow channel. Measured values for an engine control that is as accurate as possible are determinable by accurately detecting the incoming air in the intake of a motor vehicle internal combustion engine.11-06-2008
20130098168CONSTRUCTION FOR MOUNTING ULTRASONIC TRANSDUCER AND ULTRASONIC FLOW METER USING SAME - Ultrasonic transducers are attached in a direction of compressing O-ring provided in a housing with a flow passage. Biasing means makes contact with and presses these ultrasonic transducers and at multiple points. A screw is provided for locking this pressing means to the housing. This enables the use of O-ring as a sealing means. Accordingly, an in-expensive ultrasonic flowmeter that facilitates signal processing by reducing propagation of vibration of the ultrasonic transducer to the housing can be achieved.04-25-2013
20080282808Measuring Means for Measuring a Flow Rate of a Medium Independently of the Medium - A measurer for measuring a flow rate of a medium which may be multi-component or heterogeneous, independently of the medium, a signal-generating unit generating a transmit signal on the basis of a reference signal of a signal generator and transmitting same by means of a stimulator via the flowing medium. This signal is received by a sensor and passed on to an evaluating unit which is implemented to determine a signal transfer time based on a plurality of mutually corresponding locations of a waveform of the receive signal and the waveform corresponding to the reference signal and the flow rate of the medium based on the signal transfer time and the certain distance between the stimulator and the sensor.11-20-2008
20100257940ULTRASONIC TRANSDUCER FOR DETERMINING AND/OR MONITORING FLOW OF A MEASURED MEDIUM THROUGH A MEASURING TUBE - An ultrasonic transducer for determining and/or monitoring flow of a measured medium through a measuring tube, which includes at least one piezoelectric element, at least one coupling element and at least one adapting, or matching, layer between the piezoelectric element and coupling element. The adapting, or matching, layer has a thickness smaller than a fourth of an uneven integer multiple of a wavelength of an ultrasonic signal being used.10-14-2010
20100192702MULTILAYER FLOW PATH MEMBER OF ULTRASONIC FLUID MEASUREMENT APPARATUS AND ULTRASONIC FLUID MEASUREMENT APPARATUS - A multilayer flow path member of an ultrasonic fluid measurement apparatus and an ultrasonic fluid measurement apparatus capable of enhancing the measurement accuracy of the mean flow velocity are provided. When a multilayer flow path member 08-05-2010
20100218617METHOD FOR MEASURING FLOW RATES IN LIQUID MELTS - The invention relates to a method for measuring flow rates in liquid melts in a temperature range above 200 DEG C. using an ultrasonic generator and to an associated ultrasonic waveguide according to the ultrasonic Doppler method. The aim of the invention is to provide good signal incoupling and outcoupling. This is achieved by the preparation of the wettability of the end face of the ultrasonic waveguide before the measuring operation, subsequent direct incoupling of ultrasonic measuring signals into the melt at an angle that is not equal to 90 DEG, achieved by the immersion of the end face of the ultrasonic waveguide into the melt, outcoupling of the ultrasonic signals reflected in the melt via the end face of the ultrasonic waveguide and routing of said signals to an evaluation circuit. To prepare the wettability of the end face, the latter is mechanically and chemically cleaned and subsequently coated with a suitable material.09-02-2010
20100242621Method and apparatus for the measurement of the mass fraction of water in oil-water mixtures - An apparatus for measuring the mass fractions of water and oil in a flowing mixture of oil and water through a pipe includes a sensor portion that measures sound velocity and temperature of the flowing oil water mixture at a first time and at a second time. The apparatus includes a temperature changer in thermal communication with the flowing fluid which changes the temperature of the flowing oil water mixture by a measurable amount between the first time and the second time. A method for measuring water mass fraction in a flowing mixture of oil and water through a pipe includes the steps of measuring sound velocity and temperature of the flowing oil water mixture at a first time with a sensor portion. There is the step of changing the temperature of the flowing oil water mixture by a measurable amount with a temperature changer in thermal communication with the flowing fluid. There is the step of measuring sound velocity and temperature of the flowing oil water mixture at a second time with the sensor portion.09-30-2010
20110005335Turbulence conditioner for transit time ultrasonic flow meters and method - An apparatus for determining fluid flow in a pipe includes an ultrasonic flowmeter which communicates with the interior of the pipe through at least one pair of apertures, where each aperture of the one pair of apertures has an effective diameter. The apparatus includes a turbulence conditioner disposed in the pipe having openings where the pitch between openings is a function of the effective diameter of the aperture. A turbulence conditioner for a pipe has openings and a pitch. The conditioner has walls between the openings whose thickness is a function of the pitch. The conditioner has a length which is a function of the pitch. A method for determining fluid flow in a pipe includes the steps of flowing fluid through a turbulence conditioner disposed in the pipe having openings where the pitch between openings, is made a function of an effective diameter of an aperture of an ultrasonic flowmeter which communicates with the interior of the pipe through the aperture. There is the step of measuring the flow with the meter. A method for producing a turbulence conditioner.01-13-2011
20110016985DEVICE AND METHOD FOR MEASURING A FLOW CHARACTERISTIC OF A FLUID IN A CONDUIT - A device for determining a flow characteristic, in particular flow velocity, of a fluid in a conduit, comprises a conduit body (01-27-2011
20110126636METHOD AND DEVICE FOR DETERMINING A FLOW RATE OF A FLUID - Disclosed are a method and a device for determining a flow rate through a pipe, wherein a first measurement device is provided which determines the flow profile of the fluid in a first region by means of a Doppler frequency shift, and a second measurement device is provided which determines the flow profile of the fluid in the pipe in a second region by means of a travel time measurement method.06-02-2011
20100064821ULTRASONIC FLUID MEASURING DEVICE - An ultrasonic fluid measuring device capable of improving a measuring accuracy is provided. In an ultrasonic fluid measuring device 03-18-2010
20080250868Ultrasound Flow Sensor with a Modulo-2Pi for a Remaining Part Tracing - The invention relates to a method for determining the running time (t) of an ultrasound flow sensor (10-16-2008
20080307895ULTRASONIC FLOW SENSOR WITH QUADRATURE DEMODULATION - An ultrasonic flow sensor, in particular for determining the flow velocity of a medium flowing through a pipeline, has at least one ultrasonic converter for transmitting and/or receiving ultrasonic signals, an oscillator, which is connected with the ultrasonic converter, and an evaluation unit, which determines a phase shift of the ultrasonic signal that was received, with respect to a reference signal. The evaluation unit includes a plurality of quadrature demodulators, which operate with different demodulation frequencies and each determine phase information about the ultrasonic signal that was received, and when a vernier unit is provided, which determines—based on the individual pieces of phase information—a phase angle or a quantity proportional thereto.12-18-2008
20110174083METHOD AND MEASURING SYSTEM FOR DETERMINING AND/OR MONITORING THE FLOW OF A MEASURED MEDIUM THROUGH A MEASURING TUBE - Measuring system (07-21-2011
20100180693ULTRASONIC RECEIVER - An ultrasonic receiver according to the present invention includes: a wave propagating portion 07-22-2010
20100024570Device for Determining or Monitoring a Medium Volume or Mass Flow Rate in a Conduit - An ultrasonic, flow measuring device having a plurality of measuring channels. At least one ultrasonic sensor is situated in a first region of a pipeline, or measuring tube; at least two ultrasonic sensors are situated in a second region of the pipeline (02-04-2010
20090000394ULTRASONIC SENSOR WITH RECIPROCAL TRANSMITTING AND RECEIVING CIRCUIT - An ultrasonic sensor has at least two ultrasonic converters for transmitting and receiving ultrasonic signals, connected with a transmitting circuit and a receiving circuit. A switching device is provided, by which the ultrasonic converters are connected in series when in the transmission mode, and they are separated from each other when in the receiving mode.01-01-2009
20080289434FLUID FLOW MEASURING INSTRUMENT - A measurement control section comprises a time measuring section for controlling an operation of measuring a travel time of an ultrasonic wave. The measurement control section operations, based on a high rate clock signal supplied from a ceramic oscillation circuit during the time measuring operation. A clock control section stops the high rate clock signal supplied from the ceramic oscillation circuit every time when the time measuring section completes its time measuring operation, and uses a low rate clock signal supplied from a quartz oscillation circuit to count a standby time between the end of measuring the travel time and the start of carrying out the next measuring operation.11-27-2008
20120006127FLOW METER UNIT WITH WATER-TIGHT CASING - An ultrasound flow meter unit, e.g. a unit forming part of a flow meter for ultrasonic measurement of a fluid flow. The unit comprises two ultra-sound transducers 01-12-2012
20120186362Adjustable ultrasonic gas flow measurement device - An adjustable ultrasonic gas flow measurement device includes a gas pipe, a transmitter, a receiver and a micro-processing module. The gas pipe is filled with a gas under test. The transmitter and the receiver are respectively installed in two ends of the gas pipe for transmitting and receiving ultrasonic signals inside the gas pipe. The micro-processing module is electrically connected to the transmitter and the receiver for generating and sending a first ultrasonic signal to the transmitter for transmitting, and comparing the phase shift of a second ultrasonic signal and a third ultrasonic signal to output a phase comparison result, wherein the transmitted first ultrasonic signal passing through the gas pipe was received by the receiver as the second ultrasonic signal, and the third ultrasonic signal is generated by shifting the first ultrasonic signal with a predetermined phase difference.07-26-2012
20110226067OSCILLATION CIRCUIT - An oscillation circuit has an oscillator having a resonant frequency, an amplifier connected to the oscillator, an energizing pulse generator for generating a energizing pulse within a certain range including the resonant frequency, a switching unit for switching between connection and disconnection of the energizing pulse generator and the oscillator, and the amplifier, and a motion command unit for sending a command signal to the energizing pulse generator for starting operation, in which the switching unit connects the oscillator and the energizing pulse generator during a cycle, a half cycle, or several cycles of the energizing pulse generated by the energizing pulse generator starting at a time when the motion command unit sends the motion signal.09-22-2011
20120079890MEASURING DEVICE AND METHOD FOR MEASURING A MEASURED VARIABLE - Method and measuring device for measuring at least one measured variable. A first sensor transmits a first measurement signal, which includes at least one half-wave of a mechanical wave or an electromagnetic wave, and, at a time t from the first measurement signal, transmits at least a second measurement signal. At least a second sensor receives the measurement signals. The travel time and TOF04-05-2012
20120285260Ultrasonic flow sensor for detecting a flow of a fluid medium - An ultrasonic flow sensor for detecting a flow of a fluid medium in a flow tube includes at least one first ultrasonic transducer, at least one second ultrasonic transducer, and at least one waveguide configured to conduct ultrasonic waves between the at least one first ultrasonic transducer and the at least one second ultrasonic transducer by reflection on walls of the waveguide, and to enable the fluid medium to flow through. The ultrasonic waves are able to propagate between the first ultrasonic transducer and the second ultrasonic transducer on at least two ultrasonic paths. Sound energies of the ultrasonic waves transmitted on the at least two different ultrasonic paths differ from one another by no more than a factor of 100.11-15-2012
20130014592ultrasonic transducer for use in a fluid mediumAANM Mueller; RolandAACI SteinheimAACO DEAAGP Mueller; Roland Steinheim DEAANM Hueftle; GerhardAACI AspachAACO DEAAGP Hueftle; Gerhard Aspach DEAANM Horstbrink; MichaelAACI Stuttgart-FeuerbachAACO DEAAGP Horstbrink; Michael Stuttgart-Feuerbach DEAANM Lang; TobiasAACI StuttgartAACO DEAAGP Lang; Tobias Stuttgart DEAANM Radwan; SamiAACI StuttgartAACO DEAAGP Radwan; Sami Stuttgart DEAANM Kuenzl; BerndAACI SchwieberdingenAACO DEAAGP Kuenzl; Bernd Schwieberdingen DEAANM Wanja; RolandAACI MarkgroeningAACO DEAAGP Wanja; Roland Markgroening DE - An ultrasonic transducer for use in a fluid medium includes at least one housing, e.g., a sleeve, which has at least one interior space, and at least one transducer core having at least one electroacoustic transducer element is accommodated in the interior space. The housing has a housing wall at least partially enclosing the transducer core using at least one hollow space.01-17-2013
20130167655ULTRASONIC FLOW RATE MEASUREMENT DEVICE - Ultrasonic flow rate measurement device includes measurement flow path in which a fluid to be measured flows, and a pair of ultrasonic vibrators that are disposed in directions such that a propagation path of an ultrasonic wave forms a V-shape relative to measurement flow path. Moreover, the device includes measurement circuit which measures a flow rate of the fluid to be measured by measuring a propagation time of the ultrasonic wave between the pair of ultrasonic vibrators, and inlet-side rectification part which is disposed, in the inlet side of measurement flow path, to stabilize the flow of the fluid to be measured. Furthermore, the device includes outlet-side coupling part which is disposed in the outlet side of measurement flow path, and signal lead-out part which outputs a flow rate value measured with measurement circuit.07-04-2013
20080250870Low Power Ultrasonic Flow Measurement - There is described a method of ultrasonic flow measurement for measuring a flow speed of a fluid in a conduit, the method comprising: providing an ultrasonic flow meter comprising a microprocessor, a clock, and a pair of ultrasonic transducers operable to transmit signals through the fluid and to receive the transmitted signals; switching the ultrasonic flow meter from a passive state to an active state at time intervals measured by the clock, an amount of power used by the ultrasonic flow meter in the passive state being less than an amount of power used by the ultrasonic flow meter in the active state; performing an ultrasonic flow measurement cycle; and switching the ultrasonic flow meter from the active state to the passive state following completion of an ultrasonic flow measurement cycle. There is also described an ultrasonic flow meter for measuring a flow speed of a fluid in a conduit.10-16-2008
20080250869Remote Monitoring of Fluid Pipelines - Pipeline including a system for monitoring fluid flowing through the pipeline includes a conduit defining an interior and at least one sensor assembly arranged in the interior. Each sensor assembly includes an energy generating system and at least one flow measuring device coupled to the energy generating system to be powered thereby. The flow measuring device provides information about flow of fluid in the conduit. The information may be transmitted to a remote monitoring location via a telematics or communications unit connected to each sensor assembly.10-16-2008
20080223147Method and Apparatus for the Ultrasonic Measurement of the Flow Rate of Flowable Media - A method for operating a measuring apparatus (09-18-2008
20130174669METHOD AND APPARTUS FOR DETERMINING FLOW VELOCITY - A multimode flow meter can use both the time-of-transit of upstream and downstream ultrasonic signals and time for transmission of downstream-only signals to determine a flow velocity of a medium flowing through a conduit. Based on factors, such as previously computed flow velocity and signal-to-noise ratio of the upstream signal, a mode of operation may be switched and only the time for transmission of the downstream signals may be used to determine flow velocity. The multimode flow meter can computer cross-flow to reduce its effect on the determination of flow velocity.07-11-2013
20120255368FLOW RATE MEASURING DEVICE - When a flow rate is equal to or more than a reference flow rate, a reference voltage is changed to a level capable of measuring stably to thereby realize the improvement of measurement accuracy at the time of a large amount of flow rate. A flow rate determination means compares a flow rate calculated by a flow rate calculation means with the reference flow rate. When the calculated flow rate is larger than the reference flow rate, the reference voltage set by a reference voltage setting means is changed, whereby the zero cross point can be detected stably at the portion where the degree of the influence of the change in the amplitude of the received signal is small. Thus, it is possible to provide a flow rate measuring device capable of measuring a flow rate stably with high accuracy even when a fluid flow is disturbed due to a large amount of flow rate.10-11-2012

Patent applications in class Transit time of acoustic waves

Patent applications in all subclasses Transit time of acoustic waves