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6055868 |
Ultrasonic flow meter
An ultrasonic flow meter for determining the flow rate of fluid flowing through tubings. The ultrasonic flow meter comprises a measuring tube having a diameter constant in its entire length, and...
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6053054 |
Gas flow rate measurement apparatus and method
A gas flow rate measurement apparatus for obtaining a normalized flow rate of a gas having at least one liquid component. The gas travels from an upstream position and in a downstream direction....
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6044714 |
Flowmeter for explosion-hazard environments
A pulse generator (48) in a flowmeter system (10) transmits an excitation pulse to a transducer assembly (12) by way of a signal-conduction medium (20) located in a region subject to an explosion...
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6041663 |
Method and device for determining the flow velocity and/or throughput of a flowing fluid
In the case of the ultrasonic measuring method and measuring device for determining the flow velocity and/or throughput of a flowing fluid in a channel according to the invention paths are used, of...
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6012338 |
Ultrasonic flow velocity measuring apparatus
An ultrasonic flow velocity measuring apparatus includes two transducers arranged to form a certain angle to a flow velocity direction to measure flow velocity of a fluid, the two transducers...
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5983730 |
Method and apparatus for measuring the time of flight of a signal
An apparatus for measuring the time of flight of a signal is provided. The apparatus for measuring the time of flight of a signal comprises a transmitter for emitting a signal, a receiver for...
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5970800 |
Method of determining the mass flow of a flow of grains
A method of determining the mass flow speed of a granular material through a channel by means of electromagnetic waves, preferably in the microwave area. According to the invention, either the...
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5918281 |
Personal speedometer
The speed of an object is measured using a device which includes a transmitter spaced a predetermined distance from a receiver. A first sound wave is propagated through air with a first velocity,...
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5905207 |
Process for measuring the flow rate of a fluid
A device for measuring the flow rate of a fluid with ultrasonic has a measuring tube (12) with ultrasound transducers (26), arranged in the area of its ends, as well as connecting pieces (16) for...
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5856622 |
Clamp-on type ultrasonic flow meter and a temperature and pressure compensation method therein
A ratio C of sonic speed in a fluid to a sinusoidal value at an incident angle of sonic waves from the pipe to the fluid is designated as a basic unknown quantity. A distance D between the opposite...
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5835884 |
Method of determining a characteristic of a fluid
A method of determining a characteristic of a fluid involves measuring a sonic transit time (102), along a non-perpendicular path, through the fluid. The sonic transit time is used to determine a...
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5831175 |
Method and apparatus for correcting temperature variations in ultrasonic flowmeters
A method for correcting the effect of transducer temperature variations in an ultrasonic flowmeter. The method includes the steps of providing ultrasonic transducers having resonant frequencies...
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5818735 |
Method and system for high resolution time-of-flight measurements
A method and system of measuring the differential time of flight of a signal transmitted between first and second transducers. First, multiple broadband signal pulses are transmitted in a first...
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5817949 |
Ultrasonic flow meter and method
An ultrasonic flow meter (10) has a pair of transducers (36, 38). A first (36) of the pair of transducers is coupled to a first divider (18) having a first predetermined divisor. A second (38) of...
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5814737 |
Apparatus and method of detecting an ultrasonic signal
An apparatus (300) for detecting an ultrasonic signal (304) has a transducer (302) that produces an electrical signal (306) in response to the ultrasonic signal (304). A threshold comparator (308)...
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5811689 |
Fluid flow meter
A fluid flow meter comprises a pair of transducers spaced apart in the direction of fluid flow. A transmitter causes acoustic signals to be transmitted in both directions through the fluid by the...
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5796009 |
Method for measuring in a fluid with the aid of sing-around technique
During sing-around-type measurement in a fluid, a transmitter repeatedly transmits sound pulses in the fluid, and these sound pulses are received by a receiver, which acoustically is disposed...
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5792965 |
Mode suppression in fluid meter conduits
The present invention relates to a fluid flow arrangement where the effects of high order acoustic modes are suppressed in ultrasonic flow measurement. In one embodiment, ultrasonic transducers are...
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5777892 |
Doppler shift velocity measuring system with correction factors
To determine the average velocity of a fluid stream, an ultrasonic signal is transmitted into the fluid and reflected ultrasonic signal received. The signals are mixed with a frequency of the...
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5777278 |
Multi-phase fluid flow measurement
A method and apparatus is disclosed to identify fluid hydrocarbon flow rates in a flow line such as a pipeline or a producing oil well having a unidirectional fluid flow including moving an...
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5753824 |
Sampling method and apparatus for use with ultrasonic flowmeters
An ultrasonic flowmeter for bidirectionally measuring the rate of flow of a fluid. Two spatially separated ultrasonic transducers alternately transmit and receive bursts of ultrasonic drive pulses...
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5748504 |
Calibration method for use with ultrasonic flowmeters
In a fluid flow measuring apparatus, a flow of fluid is established through the apparatus at a first known flow rate. For each of two states of the apparatus, electrical drive pulses are applied to...
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5747749 |
Acoustic logging to identify oil flow rate
A method and apparatus for determining the various components of a multi-phase fluid flow in a defined area includes using an acoustic transceiver tool to direct a beam of acoustic energy toward...
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5728948 |
Fluid meter construction
A fluid meter has a central cylindrical section in which time-of-flight ultrasonic measurements can be made between acoustic transducers disposed in spaced apart enlarged end sections. The central...
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5729180 |
Control of VCO in ultrasonic flow meter
An apparatus for controlling a voltage controlled oscillator (20) in an ultrasonic flow meter (18) includes a comparator (28) for comparing a received signal to an estimate signal, to form an...
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5717145 |
Detector for an ultrasonic flow meter
The flow meter is free from an external fluid flow noise. The detector has measuring pipe 1, inlet 2 and outlet 3 both axially lined up with base axis X. Pipe 1 is a straight one with opposite...
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5710379 |
Apparatus and method for determining a flow count
An apparatus for determining a flow count in an ultrasonic flow meter has an upstream oscillator (22) with an upstream signal (24) having a period proportional to an upstream transit time and a...
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5668326 |
Method and apparatus for detecting and aligning a signal
A method of detecting and aligning a signal in an ultrasonic flow meter (18) generates an oscillator signal (50) and a transmit sequence (54) on a first predetermined trigger point (55) of the...
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5650572 |
Device for ultrasonic flow measurement
An ultrasound flow measuring tube includes an ultrasound transmitter transmitting ultrasound energy toward a reflector in the tube, which reflects the ultrasound energy so that it is reflected from...
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5650571 |
Low power signal processing and measurement apparatus
A low power apparatus for measuring various process parameters and/or physical properties of a fluid or gas medium by measuring the change of a wave signal or time dependent signal as it traverses...
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5645071 |
Method for the measurement of the molar mass of gases or gas mixtures and an apparatus for the performance of the method
The invention relates to a method for the measurement of the molar mass of a gas or gas mixture and an apparatus for the performance of the method. The gas or gas mixture to be investigated is...
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5639971 |
Method and apparatus for detecting a signal
A method of detecting a signal (50) in an ultrasonic flow meter sets a first threshold (52) and a second threshold (54) at a predetermined level above the first threshold (52). An ultrasonic signal...
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5627323 |
Ultrasonic binary gas measuring device
A method and apparatus to continuously measure the ratio of gasses in a binary gas mixture. A binary gas mixture is passed through a chamber in which a single ultrasonic wave travels from one...
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5594181 |
Ultrasonic flow meter
An ultrasonic flow meter has two ring-shaped piezoelectric transducers (1, 2) comprising ring-shaped piezoelectric elements or being composed of piezoelectric sections. Both the transducers (1, 2)...
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5553505 |
Electronic fluid flow meter
An electronic fluid flowmeter includes an LSI digital device and an LSI analog device. The digital device drives a pair of acoustic transducers to transmit acoustic waves within a fluid, the flow...
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5546812 |
Method and device for determining characteristics of the flow of a medium
The invention relates to a method for determining characteristic of the flow of a medium in a channel by measuring the transit times of sound waves which are transmitted between one or more...
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5526699 |
Ultrasonic gas flow measurement method and apparatus
A transit time gas flow meter comprising a pair of transducers mounted at an oblique angle to a gas flow in a duct for measuring transit time of an ultrasonic pulse in both directions between the...
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5493916 |
Mode suppression in fluid flow measurement
Disclosed is a method and apparatus with which errors caused by the propagation of high order accoustic modes in ultrsonic flow measurement are reduced. Accoustic wave packets are transmitted...
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5467321 |
Insertion ultrasonic transducer with mode conversion and method for reducing multiple signal reception
An insertion type ultrasonic transducer assembly adapted to be mounted to a pipe for determining ultrasonic energy transit time through fluid in the pipe. The assembly includes an ultrasonic...
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5463906 |
Interchangeable disposable acoustic for use with an ultrasonic flowmeter, particularly during extracorporeal measurement of blood flow
An inexpensive disposable plastic flow body interchangeably flow connects in line a conduit flowing fluid, and also, concurrently, acoustically connects to one or more ultrasonic transducers, so as...
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5461931 |
Measurement system
A fluid measurement system includes two transducers which are located in a duct to provide a measuring path through a measuring tube. The transducers are switchable to allow each to be used for...
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5440936 |
Compact x-cross transducer array for a transit time flowmeter, particularly for use during in-vivo blood flow measurement
Multiple, typically four, acoustic transducers of a time delay acoustic flowmeter are arrayed in a X-cross, crisscross, folded geometry so as to establish a lengthy multiple-leg, typically a...
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5433117 |
Ultrasonic gas meter
The meter has a housing with an inlet and an outlet. The housing is divided between the inlet and the outlet by a partition wall through which a measuring tube with a rectangular cross-section...
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5421212 |
Method and device in acoustic flow measurement for ensuring the operability of said measurement
A method and device for acoustic flow measurement of the flow velocity of gases is disclosed. An acoustic signal is transmitted into the measurement pipe and, under ideal working conditions, the...
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5419326 |
Spirometer, more particularly an ultrasonic spirometer
The invention relates to a spirometer, more particularly an ultrasonic spirometer, in the case of which a pair of cells, of which one is a transmitter cell and the other is a receiver cell, are...
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5392645 |
Method and apparatus for flow rate measurement
The average volumetric velocity U m of a fluid flowing within a large industrial flue stack is determined by a combination of measurement and calculation techniques. The temperature, velocity head...
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5369998 |
Ultrasonic mass flow meter for solids suspended in a gas stream
Method and apparatus (1) for measuring the mass flow rate of solids suspended in a gas stream (2) flowing along a pipe (3). Two ultrasonic transducers (4, 5) are mounted in short side arms (6, 7)...
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5357810 |
Air flow measuring apparatus
An ultrasonic transducer includes a film of piezoelectric material mounted on the support column. Two overlapping metal foil electrodes are in intimate contact with the two opposite surfaces of the...
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5329821 |
Autoranging sonic flowmeter
A system for measuring the flow of a fluid in a pipe that is one of a plurality of different sizes. The system employs a pair of transducers mounted on the pipe in an upstream-downstream...
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5280728 |
Ultrasonic flow velocity measurement method and apparatus thereof
An ultrasonic flow velocity measurement method and apparatus thereof and comprises ultrasonic wave transducers disposed on the upstream and downstream sides of a pipe and a control apparatus...
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