Matches 101 - 150 out of 218 < 1 2 3 4 5 >
Match Document Document Title
5247826 Gas concentration and/or flow sensor  
A gas concentration and/or bulk flow rate sensor suitable for measuring the oxygen concentration and the bulk flow rate of gas delivered to a patient for medical purposes. Two piezoelectric...
5243863 Fluid flow measurement system using two transducers with partitions therebetween  
A measurement system includes a housing 10 with a duct 11 having an inlet 13 and outlet 14. Fluid passes though a number of apertures 47 in a chamber 21 and then through a measuring tube 40 which...
5228347 Method and apparatus for measuring flow by using phase advance  
A flow meter (10) employs phased arrays (14a, 14b, 16a, 16b, 18a, 18b, 20a, and 20b) of ultrasonic transducers mounted on the exterior of a pipe (12) to transmit and receive sound directed through...
5214966 Method and apparatus for measuring mass flow  
In a method for measuring the mass flow M of a fluid flowing through a pipe having a cross-sectional area A, the sound velocity c 2 in the fluid is determined as well as the flow velocity v of the...
5179862 Snap-on flow measurement system  
A snap-on flow measurement system includes a block which attaches to a conduit and positions at least one transducer for launching and receiving acoustic signals along a precisely defined path...
5178018 System for measuring the time for a signal to pass between two spaced points in a fluid  
A measurement system for measuring the time for a signal to pass between two transducers TDR1,2 to allow fluid speed or flow to be determined in a gas meter for example. Each transducer can...
5168762 Speed measurement device  
A fluid speed measurement device includes a pair of ultrasonic transducers (T1, T2) spaced in a measuring chamber. A transmitter and receiver system is controlled by a microprocessor (100) which...
5131278 Mounting structure for transducers with sonic-energy absorbing means  
The transducers in a transit time clamp-on flowmeter are positioned relative to one another by abutting against pin stops located in selected openings of one or more rows of openings extending...
5117698 Pulse train detection in transit time flowmeter  
A transit-time flowmeter transmits trains of ultrasonic pulses alternately upstream and downstream through a conduit having liquid flowing therein. Flow speed (fv) is a function of the total liquid...
5105666 Ultrasonic flowmeter  
An ultrasonic flowmeter includes first and second ultrasonic transducers which are mounted along a fluid measuring section opposite each other and whose connecting line makes an angle different...
5090252 Ultrasonic flow measurement installation  
An ultrasonic fluid-flow measuring device in which a measuring tube having a rectangular cross section and a measuring tube wall lying opposite a pair of ultrasonic transformers is provided. The...
5052230 Method and arrangement for flow rate measurement by means of ultrasonic waves  
For flow rate measurement by means of ultrasonic waves, on a measuring tube two ultrasonic transducers are arranged spaced apart from each other, one operating as transmitting transducer and the...
5035147 Method and system for digital measurement of acoustic burst travel time in a fluid medium  
Fluid flow along a fluid path is determined by measuring the travel time between two transducers of two oppositely travelling acoustic burst waves. A pair of phase reference signals in phase...
5001936 Mounting structure for transducers  
The transducers in a transit time clamp-on flowmeter are positioned relative to one another by abutting against pin stops located in selected openings of one or more rows of openings extending...
4930358 Method of and apparatus for measuring flow velocity by using ultrasonic waves  
The present invention relates to a method of and an apparatus for measuring flow velocity by using ultrasonic waves. Sound velocities of wedge portions constituting ultrasonic transducers provided...
4928534 Socket structure for mounting ultrasonic gas flow measuring device with respect to gas flow pipe  
A socket structure for mounting an ultrasonic gas flow measuring device with respect to a gas flow pipe which is capable of effectively preventing condensed moisture from being collected in a gap...
4914959 Ultrasonic flow meter using obliquely directed transducers  
A transducer system and method is provided for ultrasonic measurement of the flow velocity of a fluid in a pipe. Two transducers are mounted on opposite sides of a pipe, the second transducer being...
4885942 Ultrasound flow rate meter using a phase difference method and apparatus  
An ultrasound of flow rate meter which uses the phase difference method wherein two ultrasound transducers W1 and W2 are mounted offset but aligned with each other in a tube through which the...
4850220 Apparatus for measuring amount of ultrafiltrate and concentration of receiving solvent in dialysis  
An apparatus for measuring an amount of ultrafiltrate produced in a hemodialyzer and a concentration of a receiving solvent employed in the hemodialyzer by means of an ultrasonic wave, comprises:...
4838127 Ultrasonic flow meter  
Ultrasonic flow meter of the clamp-on type for the measurement of the flow rate of a liquid in a pipeline, provided with two piezoelectric transmitting-receiving transducers, each accommodated in a...
4787252 Differential correlation analyzer  
A flow meter, or flow path intervalometer, transmits a transmission signal modulated with digital pseudo-noise or similar code. The received signal is correlated with the transmitted signal at...
4748857 Ultrasonic apparatus for measuring the flow velocity of a fluid  
An ultrasonic measuring apparatus is provided for measuring the flow velocity of a fluid in a pipe. The apparatus includes a pair of sensors which are mounted on a pipe, and which alternately...
4742717 Gas flow rate measuring device  
A gas flow rate measuring device which is capable of removing a probe from a probe socket for inspection and/or replacement at the same time that while gas is flowing through a pipe. The gas flow...
4735097 Method and apparatus for measuring fluid characteristics using surface generated volumetric interrogation signals  
A method and apparatus for measuring fluid characteristics use a non-invasive ultrasonic system for generating spatially extended signals into a volume of a fluid and detecting said signals for...
4708022 Fluid flow monitoring  
An interface system (5) for connection to a fluid flow monitoring assembly is described. The monitoring assembly comprises a signal generating assembly and a signal receiving assembly (8,9) for...
4633719 Digital flow meter circuit and method for measuring flow  
In a method and apparatus for generating a signal proportional to flow in a pipe using probes strapped onto the exterior of the pipe, two ultrasonic pulse trains at a carrier frequency are sent in...
4630482 Method and apparatus for ultrasonic measurements of a medium  
A method and apparatus for measurement of time required for an ultrasonic tone burst to traverse a medium from a transmitter to a receiver is disclosed. Two transducers separated by a distance...
4610167 Apparatus for measuring flow velocity of fluids  
Disclosed is an apparatus for overcoming acoustic path angle limitations and transducer coupling problems when an ultrasonic flow measurement method is used to measure water velocity in annular...
4607520 Method and apparatus for detecting discontinuities in a fluid stream  
Method and apparatus for detecting discontinuities, such as bubbled, in a fluid stream, in which a tube is placed between a transducer transmitting successive bursts of ultrasonic energy and for...
4603589 Ultrasonic flowmeter  
An ultrasonic flowmeter for ultrasonically measuring physical parameters of a media flowing in a measuring path between two ultrasonic transducer circuits each including transmitting and receiving...
4583410 Timing circuit for acoustic flow meters  
A timing means for determining the time of travel of ultrasonic pulses between a transmitter and a receiver immersed in a fluid. The first time instant is determined when the transmitter transmits...
4581942 Measuring conduit for flow rate and concentration of fluid  
A measuring conduit adapted for flow rate and concentration of a fluid for use in a measuring apparatus which measures both the flow rate of the fluid such as a respiratory gas containing a...
4557148 Ultrasonic flowmeter  
An ultrasonic flowmeter comprising a signal generator for supplying a synchronizing signal to an ultrasonic propagation path and a frequency division time signal to a flow rate computing unit; the...
4555951 Reflective acoustic fluid flow meter  
In one embodiment, a first air flow meter includes a pair of ultrasonic transducers mounted on one wall of a conduit, and an opposite reflective wall is shaped to focus acoustic signals from one...
4552016 Sensor for currentmeter  
A sensor for a currentmeter includes a supporting member which is provided to support a pair of transmitter/receiver units which rotate around an axis that is not parallel to (i.e.-intersects) a...
4545244 Ultrasonic flow meter  
An inexpensive flow meter with a special arrangement of a minimum of transducers always provides an accurate measure of flow of the fluid in a conduit irrespective of the condition of the fluid....
4545259 Ultrasonic measuring apparatus  
The invention relates to an ultrasonic measuring apparatus of the type having a measuring path which extends in a tube between two ultrasonic converters. More accurate measuring results are...
4527433 Method and apparatus for measuring fluid flow  
A fluid flow meter and, more especially, an airflow meter having fast response and very high resolution uses piezoelectric transducers operating near resonance to pass ultrasonic signals upstream...
4527432 Dual frequency acoustic fluid flow method and apparatus  
An acoustic fluid flow meter determines the flow velocity or volumetric flow from a measurement of the phase shift of acoustic signals propagated upstream and downstream along an acoustical path in...
4523478 Sonic flow meter having improved flow straighteners  
A sonic flow meter in the form of a conduit providing a linear fluid flow path and having first and second openings on opposite sides of the conduit displaced in an upstream-downstream relationship...
4509372 Acoustical wave flowmeter with increased density capability  
In a flowmeter system having a transducer assembly defining a path for confining the flow of fluid medium there through and with first and second acoustic transducer elements disposed along said...
4509373 Calibration circuit for ultrasonic flowmeter  
A calibration circuit for an ultrasonic flowmeter of the type described in U.S. Pat. No. 3,981,191 wherein a frequency counted variable delay is used to simulate flow. A stable gated oscillator is...
4506552 Coaxial flowpath apparatus  
An apparatus for the ultrasonic measurement of cryogenic or high viscosity fluid flow provides for precooling and symmetrical flow in the measuring run of one of two coaxial inner and outer...
4480485 Acoustic flowmeter with envelope midpoint tracking  
An acoustic burst with a predetermined amplitude envelope is triggered by a square wave signal and transmitted upstream or downstream to a transducer connected to an adaptive control system which...
4480486 Apparatus for measuring liquid flow  
In a housing two ultrasonic measuring transducers are arranged opposite of the two end faces of a test tube. The test tube providing a measuring section penetrates a separating wall and...
4478088 Flowmeter system with ultrasonic energy improvement in equilibration  
A flowmeter system and method comprising device defining a path for the flow of a fluid medium therethrough, first and second spaced apart transducers disposed along said flow path for generating...
4468971 Ultrasonic flowmeter for clean and dirty fluids  
An ultrasonic flowmeter for accurately measuring the flow rate of clean or dirty industrial process fluids passing through a pipe provided with upstream and downstream transducers. A transmission...
4454767 Ultrasonic metering device  
An ultrasonic metering device having two ultrasonic transducers, each having an ultrasonic conversion element and a wedge for holding the conversion element, mounted on a pair of mounting members...
4452090 Ultrasonic flowmeter  
An ultrasonic flowmeter which measures gas velocity including a pair of ultrasonic transducers oppositely located around a conduit at a predetermined angle to the flow direction. Each transducer...
4446744 Ultrasonic flowmeter  
An ultrasonic flowmeter arrangement has a pair of electroacoustic transmit/receive transducers located in opposite walls of a pipe, the transducers being longitudinally displaced and facing one...
Matches 101 - 150 out of 218 < 1 2 3 4 5 >