Matches 201 - 250 out of 363 < 1 2 3 4 5 6 7 8 >


Match Document Document Title
6301973 Non-intrusive pressure/multipurpose sensor and method  
Method and apparatus are provided for determining pressure using a non-intrusive sensor that is easily attachable to the plumbing of a pressurized system. A bent mode implementation and a hoop...
6263731 Method and assembly for monitoring a predetermined level in a container  
An assembly for monitoring a predetermined level of a material in a container comprises two ultrasonic transducers mounted on the container in line with the level to be monitored, such that an...
6244114 Airflow measurement device  
A hand-held air flow measuring device comprises a plurality of transducer members mounted on a housing, each transducer member having a piezoelectric membrane which transmits and receives...
6226598 Method of measuring the propagation time of a sound signal in a fluid by means of a zero-crossing of said sound signal  
Measuring the propagation time of a sound signal between two spaced-apart transducers disposed in a fluid flow involves determining the zero-crossing of the signal. Each received sound signal is...
6178827 Ultrasonic flow sensor  
A transit time ultrasonic fluid flow sensor is configured as a self contained modular unit that does not rely on acoustic transmissions through or reflected by a pipe for operation. A highly...
6158289 Multiple orifice ultrasonic meter for measuring flow of specific grades of fuel  
A multiproduct fuel dispensing system for dispensing different grade fuels stored in several reservoir tanks. Several fuel delivery conduits deliver a specific grade of fuel from one or more of...
6151558 Ultrasonic marine speedometer system  
Methods, devices and system for measuring the speed of the watercraft relative to the water through which it travels. An embodiment comprises two streamlined fins configured to extend at least...
6142015 Method and assembly for overfill detection in liquid level sensing in a vessel by the pulse transit time technique  
Sensing the level of a liquid in a vessel by the pulse transit time technique is done by means of an ultrasonic transducer mounted above the highest-permissible level in the vessel which emits...
6138507 Apparatus for establishing and/or monitoring a predetermined filling level in a container through controlled transducer phase and impedance  
An apparatus for establishing and/or monitoring a predetermined filling level in a container is described, in which a fixed phase difference (ΔφR), which is independent of the oscillation quality...
6089104 Ultrasonic flow meter using transit time across tube chords for determining the flow rates  
An ultrasonic multi-channel flow rate measuring system provides a single ultrasonic pulse emitting transducer mounted in a circular tube in which fluid flows at a tube cross section intermediate a...
6067861 Method and apparatus for ultrasonic doppler velocimetry using speed of sound and reflection mode pulsed wideband doppler  
According to the present invention, a method and apparatus rely upon tomographic measurement of the speed of sound and fluid velocity in a pipe. The invention provides a more accurate profile of...
6065350 Flow measurement system with guided signal launched in lowest mode  
A signal transducer mounts to a straight tube to measure the flow velocity of fluid flowing therein. The transducer operates at a frequency above cut-off allowing multiple modes to exist, and is...
6062091 Method and apparatus for determining ultrasonic pulse arrival in fluid using phase correlation  
Apparatus for determining the arrival time of a sonic signal transmitted through a fluid medium flowing in a vessel comprising, a transmitter for generating a sonic signal for transmission through...
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,...
6026693 Pipe spool section having square or rectangular cross-section for clamp on transducer and method for flow measurement  
Apparatus for insertion into a pipe adapted for mounting an ultrasonic flow measurement transducer, the apparatus comprising, in a preferred embodiment two flanges adapted to connect into a pipe,...
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...
6012020 Apparatus and method for monitoring the condition of septic tanks  
An electronic sensor for detecting when a septic tank reaches it's design capacity. The sensor uses a sonar transponder to measure the thickness of the three layers of material present in a...
6009761 Multiproduct fuel dispenser using ultrasonic metering  
A multiproduct fuel dispensing system for dispensing a plurality of fuels stored in a plurality of reservoir tanks. A single fuel delivery conduit delivers a specific grade of fuel from the...
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...
5907099 Ultrasonic device with enhanced acoustic properties for measuring a volume amount of fluid  
An ultrasonic measurement device measures a volume-related quantity of a fluid flowing from a first zone to a second zone of the device. The device includes two ultrasound transducers emitting and...
5877416 Anemometer employing standing wave normal to fluid flow and travelling wave normal to standing wave  
An anemometer comprises an acoustic resonant cavity 1 between two plates 2 and 3 and open in the direction of flow of a fluid, the cavity having at least one pair of electro acoustic transducers 5...
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...
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...
5824915 Volumetric flow meter  
A volume flow meter for flowing media that works on the transit-time principle includes a conduit measurement section carrying the flowing medium, two ultrasonic transducers arranged on opposite...
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)...
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...
5804739 Method and circuit arrangement for the measurement of flow speed by means of acoustical transit time differences  
A method of determining the time point (t0) of the start of a high frequency oscillation packet triggered as a result of a corresponding external excitation which is extremely tolerant relative to...
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...
5770806 Acoustic flow measurement method and measurement apparatus implementing the method  
An acoustic measurement method of flow measurement for determinating fluid flow velocity or other variables in a measurement pipe section by determining over an exactly determined length (±a±b)...
5734111 Apparatus for measuring the flow quantity of rivers and method thereof  
A first measurement unit for untrasonically measuring a flow velocity, a river depth, and an ultrasonic velocity is mounted on floating members. The floating members are connected with a...
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...
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...
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...
5652396 Fluid flowmeter  
A fluid flowmeter includes a conduit through which fluid flows by way of an inlet and an outlet for flow rate measurement. A first transducer transmits signals to and receives signals from a...
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...
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...
5637800 Ultrasonic transducer array and manufacturing method thereof  
An ultrasonic transducer array, and a method for manufacturing it, having a plurality of transducer elements aligned along an array axis in an imaging plane. Each transducer element includes a...
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)...
5571974 Method and apparatus for the measurement of particle flow in a pipe  
A system to measure the flow of coal using externally mounted vibration sensors. One or more vibration sensors are located on a pipe section which is not impacted by coal particles in the flow...
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...
5540105 Funnel inlet and funnel outlet for ultrasonic gas meters  
A space saving funnel inlet and funnel outlet is provided proceeding from the pipe connections of bellows gas meters with 90° flow deflection for ultrasonic gas flowmeters with a low pressure...
5533408 Clamp-on ultrasonic volumetric flowmeter  
To permit this flowmeter to automatically operate either on one measurement principle or on another depending on a selectable foreign-particle content of the fluid, it has a first pair of...
5531125 Method and device for simultaneously measuring the flow speed and the depth of a river  
A method and a device for simultaneously measuring the flow speed and the depth of a river is provided. The method and the device use ultrasonic wave to measure average flow speeds at a plurality...
5531124 Ultrasonic flow measuring method and apparatus thereof  
An ultrasonic flow measuring method and apparatus thereof comprises a plurality of ultrasonic vibrator apparatus mounted around the peripheral edge of a large caliber pipe at predetermined...
5531116 Apparatus and method for phase tomographic determination of fluid currents  
An array of acoustic signal sources and sensors are positioned in a fluid. Acoustic signals propagated through the medium are subjected to phase differences as they pass through fluid currents. An...
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...
5515733 Ultrasonic transducer system with crosstalk isolation  
Transducers are mounted in a housing or vessel to propagate signals along a fluid measurement path, and a plurality of massive elements are placed between transmitting and receiving transducers in...
5515721 Local river flow velocity measuring method and apparatus therefor  
A local river flow velocity measuring method and apparatus therefor comprises a flow velocity meter and a flow velocity measuring circuit, in which the flow velocity meter includes a plurality of...
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...
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...

Matches 201 - 250 out of 363 < 1 2 3 4 5 6 7 8 >