Matches 151 - 200 out of 218 < 1 2 3 4 5 >
Match Document Document Title
4425804 Ultrasonic air flow transducer for high humidity environments  
A transducer assembly comprising an inner, primary, transducer having a pair of transducers fixed to a liner or cavity for providing the fluid compression sending and receiving signals for...
4424715 Ultrasonic measuring device  
The apparatus herein relates to an ultrasonic measuring device having a quadrupole circuit unit. Two ultrasonic converter circuits are alternately and complementary operable as transmitter and...
4417481 Apparatus for measuring the speed of flow of a flowable medium by determining the transit time of sound waves therein  
Apparatus for measuring the speed of flow of a flowable medium by determining the transit time of sound waves therein wherein first and second sound transmitter/receivers in the form of...
4409847 Ultrasonic measuring arrangement for differential flow measurement, particularly for measurement of fuel consumption in motor vehicles with a fuel return line  
A device for measuring a differential flow rate between a foward flow to a user station and a return flow from the user station, particularly well-suited for measuring fuel consumption in motor...
4408589 Process and apparatus for operating an internal combustion engine  
An ultrasonic transmitter is disposed on one wall inside the air induction tube of an internal combustion engine and an ultrasonic receiver is disposed on the opposite wall, downstream of the...
4397194 Ultrasonic flowmeter including means to measure pipe geometry  
An ultrasonic flowmeter for measuring the flow rate of fluid conducted through a pipe, the meter including a pair of alternately-excited transducers, one being placed at an upstream and the other...
4397193 Transducer drive circuit for ultrasonic flowmeter  
An ultrasonic flowmeter including a pair of alternately-excited upstream and downstream transducers, an acoustic pulse emitted by one transducer and propagated through the fluid being received by...
4384491 Analog ultrasonic flowmeter  
A meter for measuring the velocity of a fluid by ascertaining propagation periods of acoustic wave packets transmitted therein, the meter including a pair of transducers for disposition in the...
4375767 Flow-through flow meter with ultrasound  
A transducer is provided for a flow meter wherein the transducer has an interdigital structure of a polarization structure and/or of electrodes for the purpose of direct ultrasonic radiation at an...
4372167 Flowmeter system with improved loop gain  
A flowmeter system having circuitry defining a path for confining the flow of a fluid medium therethrough, first and second transducers disposed along said flow path for generating and receiving...
4372166 Flowmeter system with digital phase shifter and calibration  
A flowmeter system having a device defining a path for confining the flow of a fluid medium therethrough, first and second transducers disposed along said flow path for generating and receiving...
4372168 Flowmeter  
An ultrasonic flowmeter including two phase locked loops with four voltage controlled oscillators, a portion of each loop forming a common path through amplifiers, an electronic attenuator with...
4365518 Flow straighteners in axial flowmeters  
An improved sonic flowmeter having a conduit with an inlet and outlet through which fluid flows for rate measurement, a portion of the conduit providing a linear flow path, a first and second...
4345479 Flowmeter system with synchronous clock for generation of timing signals  
A flowmeter system for measuring the flow and changes in the velocity of sound due to changes in composition or temperature of a fluid medium in a flow tube including transducers which generate...
4337667 Ultrasonic flowmeter  
An ultrasonic flowmeter includes: a transmitting device for transmitting a continuous ultrasonic wave into a fluid to be measured; a receiving device spaced by a predetermined distance from the...
4331025 Methods of measuring fluid viscosity and flow rate  
A method of measuring the flow rate of a fluid through a conduit by means of a sonic flow meter employing the steps of measuring the speed of sound transmission through the fluid from an upstream...
4321835 Apparatus for measuring the flow velocity of a fluid  
An apparatus for measuring fluid flow velocity includes an oscillation generator triggered by a circuit driver and a receiver which are disposed in oblique, opposed relation with respect to the...
4320666 Fluid flow measuring apparatus  
Fluid flow measuring apparatus comprises two ultrasonic transducers (1, 2) between which an ultrasonic energy beam is transmitted through the fluid. The beam is frequency modulated (4, 5) by an...
4308754 Ultrasonic flowmeter  
An ultrasonic flowmeter for determining fluid flow velocity within a conduit by determining the difference in transit time between interrogating ultrasonic pulses transmitted upstream between a...
4300400 Acoustic flowmeter with Reynolds number compensation  
An acoustic flowmeter wherein pulses of acoustic energy are transmitted between upstream and downstream transducers through the fluid under measurement and wherein the arithmetic computation of...
4286470 Clamp-on ultrasonic transducer  
A clamp on ultrasonic transducer having a clamping element which can be positioned around a conduit with the inner portion of the clamping element being formed to fit closely against the outer wall...
4271708 Ultrasonic measuring apparatus  
An ultrasonic measuring apparatus of the type having a pair of transducers disposed oppositely on a pipe through which a fluid to be measured flows and which are so controlled alternately as to...
4246800 Strobed power supply for an ultrasonic measuring instrument  
In a measuring instrument for obtaining information about a medium through which ultrasonic signals can be transmitted or from which ultrasonic signals can be reflected, transducers (21 and 22) are...
4232548 Liquid flow meter  
A sonic flow meter for measuring the rate of flow of a fluid within an enclosed axially elongated hollow conduit is disclosed. First and second transducers are secured to the exterior surface of...
4227407 Volume flow measurement system  
An apparatus and method for direct measurement of the volume flow of fluids through a tube, using an interferometric transit time technique is disclosed. First and second transducers for producing...
4192184 Mass flowmeter  
Disclosed is a mass flow rate meter having two U-shaped flow loops, means for vibrating the flow loops like the tines of a tuning fork, timing means on the loops for sensing the difference in times...
4186599 Vortex shedding flowmeter assembly  
The present invention relates to a flow velocity measuring apparatus which provides a distinct, measurable pattern of vortices known as Karman Vortex Generation. The apparatus is arranged to...
4164865 Acoustical wave flowmeter  
A flowmeter for accurately determining the rate of flow of a gas substantially independent of its molecular composition and also for determining a measure of the velocity of sound in that gas. The...
4159647 Apparatus for measuring the flow quantity or associated parameters of a liquid with two ultrasonic transducers  
The invention relates to ultrasonic apparatus for measuring flow quantities and related parameters of a liquid flowing with a free surface in a channel. Two transducers are mounted in...
4144752 Ultrasonically operative device for determining physical quantities of a medium  
The invention relates to an ultrasonically operative device operable with an ultrasonic signal having a predetermined wave length for measuring physical quantities such as the flow speed of a...
4114439 Apparatus for ultrasonically measuring physical parameters of flowing media  
The invention relates to apparatus for ultrasonically measuring physical parameters of flowing media. A measuring path has two ultrasonic converters with transmitting and receiving devices being...
4104915 Ultrasonic device for the determination of the rate of air flow in the inlet duct of an internal combustion engine  
A device for determining the rate of flow of air in the intake duct of an internal combustion engine comprises a detector duct of generally rectangular cross section housing two ultrasonic...
4078427 Ultrasonic flow or current meter  
An ultrasonic flow or current meter having at least one pair of transducers, a transceiver which applies a pulse signal to one of the transducers to produce an ultrasonic pulse wave, the other...
4069713 Arrangement for determining liquid and gas flow rates  
By means of sonic or ultrasonic energy, flow rate is determined as a linear function of the difference between two frequencies by taking measurements in the direction of flow and in the direction...
4065958 Method of controlling physical characteristics of fluid medium  
A method of controlling physical characteristics of a fluid medium by transmitting ultrasonic vibrations to the medium under control through a sound conducting medium and through a pipe wall at an...
4022058 Apparatus for determining the arrival time of alternating signals  
Received ultrasonic bursts of energy are rectified and converted into pulse trains and also envelope detected. The envelope is fed to a ramp generator whose output is threshold detected to provide...
4019373 Ultrasonic transducer mounting and coupling assembly  
An ultrasonic transducer apparatus for sensing flow velocity through a pipe wall has a pair of strap-on transducer assemblies for securing to an unprepared pipe surface, the energy coupling between...
4014210 Device for use in the ultrasonic measurement of mass flow of gas  
In a device for measuring ultrasonically the flow of gas, for example the air flow in the induction duct of an internal combustion engine, an upstream piezo-electric transducer is located in a...
4011753 Method and device for measuring the flow velocity of media by means of ultrasound  
Ultrasonic waves, produced from electric signals at one end of a measuring section having the length s, are transmitted through the measuring section and re-transformed into electric signals at the...
4011755 Acoustic flowmeter  
In the acoustic flowmeter apparatus disclosed herein, repetitively gated bursts of relatively high frequency acoustic energy are transmitted between upstream and downstream transducers in a conduit...
3987674 Transducer structure and support for fluid measuring device  
Transducers are positioned on opposite sides of a fluid conduit and are longitudinally displaced from one another along the axis of the conduit. Each transducer contains a transmitting and...
3981191 Method and apparatus for the ultrasonic measurement of the flow velocity of fluent media  
Ultrasonic signals are transmitted alternately upstream and downstream in a fluent media. A reference signal timed to occur at the estimated time of arrival of the alternate signals is used to...
3974693 Multiple time difference ultrasonic flowmeter  
An improvement in systems for measuring the rate of fluid flow in a pipe or an open unrestricted channel as a current at sea or ocean wherein the time delay between acoustic pulses transmitted...
3964309 Device for determining mass air flow in a conduit  
An ultrasonic device for determining the air flow rate in a conduit, comprising a duct, which may form part of the conduit or may be connectable thereto, at each end of which is a respective...
3954008 Ultrasonic flow or current meter  
An ultrasonic flow or current meter is disclosed in which a first ultrasonic sing-around system is connected to a pair of ultrasonic vibrators attached to a pipe through which liquid to be measured...
3914998 Ultrasonic flowmeter system with alternating two-way transmission  
A two-transducer ultrasonic flowmeter system in which trains of pulses are alternately transmitted upstream and downstream and in which the transmission direction is reversed at a relatively slow...
3882722 Multiple time difference ultrasonic flowmeters  
An improvement in systems for measuring the rate of fluid flow wherein the time delay between acoustic pulses transmitted upstream and downstream in a fluid passing along a path of travel is...
3869915 DIGITAL FLOWMETER  
A digital flowmeter provides axially spaced transducers clamped on the exterior of a fluid conducting conduit. Sonic energy from the first transducer is applied through the pipe and into the medium...
3835704 FLUID FLOW METERS  
A fluid flow meter employing a single pair of sonic signal transducers and methods for alternately energizing each of said transducers to convert them alternately into sonic generators and...
3818757 DUAL PATH ULTRASONIC FLUID FLOW METERING SYSTEM AND METHOD  
An ultrasonic fluid flow metering system for use in monitoring volumetric flow of fluids conveyed in conduits or open channels. The flow meter includes at least one pair of transducers which...
Matches 151 - 200 out of 218 < 1 2 3 4 5 >