Matches 251 - 300 out of 363 < 1 2 3 4 5 6 7 8 >


Match Document Document Title
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...
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...
5460047 Flow measurement system including ultrasonic transducers  
A sensor system includes an ultrasonic transducer head with plural transducing elements. The elements are arranged in pairs with the first one of each pair lying in a first plane and the second...
5440937 Process and apparatus for ultrasonic measurement of volumeric flow through large-diameter stack  
An apparatus and method for measuring gas flow velocity through a high stack employs ultrasonic transducers. The transducers are placed on opposite ends of a diameter several hundred feet up, with...
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...
5442592 Ultrasonic distance meter  
An ultrasonic distance meter cancels out the effects of temperature and humidity variations by including a measuring unit and a reference unit. In each of the units, a repetitive series of pulses...
5437194 Ultrasonic transducer system with temporal crosstalk isolation  
Transducers are mounted in a housing or vessel to propagate signals along a fluid measurement path, and received signals are temporally separated to remove crosstalk in the acoustic propagation...
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...
5373736 Acoustic current meter  
An acoustic current meter in which a CW burst is transmitted first in one direction along each acoustic path and then in the reverse direction along such path so that a single receiver system may...
5372047 Gas/liquid ultrasonic flowmeter  
Improvement to a gas/liquid ultrasonic flowmeter in which focusing profiling (501, 502, 503) is provided in the measurement tube thereof for at least one of the plurality of reflection points of...
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...
5351560 Ultrasonic flow meter  
Ultrasonic flow meter having a W-shaped ultrasonic path in the measurement tube (1) and having a stepped elevation/depression of the inner wall of the tube at the site of reflection of the...
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...
5325726 Method and device for measuring volume flows in liquids and gases  
A method and device for measuring a volume flow of fluids in flow channels using ultrasound, wherein two ultrasonic transducers, each with a different transmitting frequency, are disposed in a...
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 c2 in the fluid is determined as well as the flow velocity v of the...
H001132 Particle tracking technique for studying fluid flow in industrial vessels  
An apparatus and method for determining the position of an object, especially the position of a movable object in an industrial vessel. The position is determined by the use of two signals having...
5152174 Mass flow rate sensor and method  
An acoustic signal is transmitted into a flowing gas (10). The velocities of propagation of the signal in two predetermined directions are measured, and combined with sensed gas pressure and the...
5131279 Sensing element for an ultrasonic volumetric flowmeter  
This sensing element, which is to be installed in a pipeline conducting the fluid to be measured, consists of a straight section of pipe (1) with an unrestricted cross-sectional area and an...
5123286 Electric measuring device for measuring the propagation delay of an electrical signal  
To determine the exact instant (Ts) between the instant of transmission (T0) of the leading-edge of a square-wave pulse (S1) transmitted by a transmitter (4) and the instant (T1) of the first...
5040415 Nonintrusive flow sensing system  
A nonintrusive flow sensing system (10) and related method are provided for monitoring fluid flow within a conduit (14), particularly such as a liquid flow (12). The sensing system (10) includes...
4896540 Aeroacoustic flowmeter  
The flowmeter is based on a measurement of phase difference between two points on the circumference of a pipe separated axially by an integral multiple of sound wavelength. Plane sound waves are...
4882931 Method and an apparatus for determining the velocity, direction and other magnitudes of a flow, in particular a gas flow  
A method and an apparatus for determining the velocity, direction and other magnitudes of a flow, in particular a gas flow, in which a strongly damped acoustic signal is emitted by a first...
4852575 Ultrasound flow measurement apparatus  
An ultrasound lens is a solid rod with a front concave spherical surface which defines a back focal plane in the rod when the lens is immersed in a propagating medium. The opposite end of the rod...
4831884 Device for determining the flow velocity of a medium in a cylindrical conduit  
A device for measuring the flow velocity of a medium in a conduit includes a first and a second pair of transducers, for respectively emitting acoustic waves through the conduit and receiving same...
4782697 Acoustic current meter  
An acoustic travel time flow meter, for use in measuring turbulent vector flow data, capable of extended deployment in which acoustic pulse generation and measurement are interleaved to conserve...
4693319 Correlation detection type ultrasound blood flowmeter  
A correlation detection type ultrasound blood flowmeter for measuring speed of flowing blood which is passing across two sample volumes which are respectively positioned at the same distance to...
4663977 Sonic measurement of gas flow  
A microcomputer is interfaced to a pair of probes for sending and receiving sonic signals across a flow stream of gas. The microcomputer reads phase information and determines a phase difference...
4658834 Medical apparatus for monitoring body liquid discharge  
A medical apparatus for automatically measuring and displaying the quantity of a liquid discharged by a patient during a defined real time interval. The apparatus is comprised of a reusable...
4644483 Apparatus for determining the transit time of ultrasonic pulses in a fluid  
An apparatus for determining the transit time of ultrasonic pulses in a fluid has two spaced apart electro-acoustic converters (11, 20). A transmitter signal proportional to the sound pressure is...
4628725 Apparatus and method for analyzing a fluid that includes a liquid phase, contained in a tubular conduit  
Apparatus and methods for the flow analysis of multiphase fluids including a liquid phase in a tubular conduit use Stoneley waves by exciting and detecting sonic wave energy in the tubular...
4616510 Fluid velocity measuring method and apparatus  
An acoustic flow meter in which a plurality of different frequencies are transmitted in both upstream and downstream directions, and corresponding differences in transmission phase-delays due to...
4611496 Ultrasonic flow meter  
In an ultrasonic flow meter in which an ultrasonic transducer for transmission and an ultrasonic transducer for reception are arranged so as not to be opposite to each other, so that the flow rate...
4601210 Flowmeter with radial vibrational mode for ultrasonic waves  
An ultrasonic flowmeter of the upstream-downstream type having piezoelectric crystals operated in the radial mode, as well as the compression mode, or primarily the radial mode. If both modes are...
4563894 Paramagnetic oxygen sensor  
Apparatus comprising a test chamber, an electric solenoid and a pressure detector is provided to measure the partial pressure of oxygen contained in a mixture of gases. As a result of the...
4538469 Integrated threshold arming method and apparatus  
An intervalometer for determining the arrival time of a bandwidth limited energy pulse employs an integrated threshold arming apparatus and method for conditioning an event recognition circuit....
4532812 Parametric acoustic flow meter  
Method and apparatus for measuring the flow velocity of drilling mud returning from the annulus of a borehole. At least two parametric acoustic pulse transducers are longitudinally disposed with...
4515021 Intervalometer time measurement apparatus and method  
An intervalometer for determining the transit time of an ultrasonic energy pulse through a fluid medium employs an automatic gain control amplifier circuit for amplitude stabilizing the electrical...
4495822 Fluid flow meter  
A method of determining the velocity of a stream in a vessel comprising the steps of: providing a first quantity of ultrasonic energy to a wall of the vessel at a first predetermined location so...
4493217 Process and apparatus for measuring travel time differences of ultrasonic pulses for the determination of flow fields  
Laser beams are modulated by ultrasonic pulses transmitted through gaseous media as a means of determining flow field patterns and temperatures without disturbing the test media.
4488428 Ultrasonic air flowmeter for motor vehicles  
An ultrasonic air flowmeter for an internal combustion engine of a motor vehicle includes at least two ultrasonic transmitter-receivers. One of the ultrasonic transmitter-receivers generates...
4483202 Ultrasonic flowmeter  
An ultrasonic flowmeter for measuring a flow rate in a conduit. A pair of ultrasonic transducers are disposed in a conduit so as to oppose each other such that a line connecting the pair of...
4480483 Acousto-optical ultrasonic flowmeter  
A flowmeter wherein measurements relating to fluid flowing in a pipe are obtained by transmitting a laser beam from a high power pulsed laser into the fluid through an optical window in the pipe....
4467659 Transducer having metal housing and employing mode conversion  
A pair of transducers each having metal housings are clamped at spaced axial locations along a conduit and transmit ultrasonic signals to one another through the fluid within the conduit. The...
4462261 Mass and velocity flowmeter  
A device is disclosed for measuring the mass and velocity of a fluid flowing in a conduit, in a flow direction, which comprises a pair of signal transducer arrays each disposed at planes extending...
4445389 Long wavelength acoustic flowmeter  
A nonintrusive instrument for measuring the volume flowrate of, and the speed of sound in, an arbitrary fluid in a pipe, tube or duct. The sound speed measured is that of a stationary fluid even...
4417480 Dampened ultrasonic transducer  
An improved dampened ultrasonic transducer for imparting sonic energy to or receiving sonic energy from fluid, having a housing with a cylindrical cavity therein providing a closed end wall at one...
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...
4402231 AGC Amplifier for ultrasonic measuring system  
An ultrasonic flow rate measuring system in which a pulse of ultrasonic energy is emitted by a transducer placed on a pipe conducting the fluid to be metered, the energy being propagated through...
4391136 Three-axis current meter  
A three-axis current meter for measuring all three components of current velocity in the absence of self-interference caused by the sensor supports. Acoustic transducers for measuring the current...

Matches 251 - 300 out of 363 < 1 2 3 4 5 6 7 8 >