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8109155 Methods and apparatus to measure fluid flow rates  
Example methods and apparatus to measure fluid flow rates are disclosed. A disclosed example apparatus includes a circulator to selectively circulate a fluid in a flowline, a generator thermally...
7856892 Flow-rate measuring method and flow-rate measuring device  
A measurable flow-rate range is increased to enhance usability. A flow-rate measuring method for measuring the flow rate of a fluid inside a tube is provided. This method uses a thermal-marker...
7726204 Heat signal writing device  
A heat signal writing device forming a clear writing pattern of a heat signal is provided. A heat signal writing device 10 for writing a heat signal in a medium traveling through a channel, which...
7409875 System and method for determining velocity of electrically conductive fluid  
A flowing electrically-conductive fluid is controlled between an upstream and downstream location thereof to insure that a convection timescale of the flowing fluid is less than a thermal diffusion...
7377185 Device and method of detecting flow rate/liquid kind, and device and method of detecting liquid kind  
A flow rate/liquid type detecting method for detecting the flow rate of a fluid and, at the same time, detecting any one of or both the type of the fluid and the concentration of the fluid,...
7293605 Feed-back control system for heat exchanger with natural shedding frequency  
The invention relates with the feed-back control system of a heat exchanger by use of the flow resonance phenomenon which maximizes the heat transfer efficiency by generating the flow disturbances...
7281435 Measurement of non-aqueous phase liquid flow in porous media by tracer dilution  
A method and apparatus for measuring in situ flow of non-aqueous phase liquids (NAPLs) through a porous medium is described. A tracer is introduced into a well or boring located in the medium and...
7270015 Thermal pulsed ultrasonic flow sensor  
In thermal pulse flow measurements a relatively small bolus of flowing fluid is heated or cooled and the time required for the bolus to move downstream a known distance is measured. In many fluids,...
7261004 Flow transducer and method  
A transducer is disclosed for sensing flow of a fluid. The transducer includes means for applying a heat pulse to the fluid and at least one temperature sensor. The temperature sensor is adapted to...
7201049 Pulsed thermistor sensor  
A thermistor is pulsed with energy, and a time constant of decay of temperature is calculated based on measured resistance of the thermistor over a number of known intervals. The time constant is...
7127954 Method and device for measuring the flow rate of a fluid  
A method for measuring the flow rate of a fluid flowing in a conduit includes separating the fluid into two portions then flowing into two branches (20, 22). Both portions are then recombined in an...
7051599 Thermal transient anemometer having sensing cell assembly  
A thermal transient anemometer provides mass flow rate or volume flow rate over smaller discrete regions of a larger flow field, i.e., the distribution of such rates over a predefined, larger area....
6935192 Microfluidic bulk flow determinations based on converting heat tracer measurements  
The fluid flow rate within a microfluidic passageway of a microfabricated device is determined by measuring the time-of-flight of a heat pulse coupled into the fluid. Since the propagation velocity...
6932796 Liquid metering system  
Systems and methods for measuring the flow of a liquid along a conduit are disclosed. A heat source applies thermal energy to a portion of a liquid flowing along a conduit thereby elevating its...
6732581 Low thermal capacity device for high precision pocket-size spirometry and other applications  
The spirometer has a low thermal capacity. A circuit supplies power to the spirometer in pulses to heat the spirometer to body temperature. The circuit senses the temperature of the spirometer...
6672172 Triggered flow measurement  
When a bolus dose of cold saline is injected into a catheter where a wire, carrying a sensor unit and electrical leads for signal transmission, is located, the lead resistance is affected by the...
6668663 Method and apparatus to determine flow rate with the introduction of ambient air  
A method of determining a rate of flow of a first gas in a pipe includes placing a flow-restricting device in the pipe such that the device and/or the pipe define a first channel section and a...
6530286 Method and apparatus for measuring fluid flow  
The present invention relates to methods and apparatus useful for detecting and measuring flow of a fluid along a flow path. In a method according to the invention, the temperature of a flowing...
6505520 Method for preparing a thermal pulsed micro flow senor  
Disclosed is a method for preparing a thermal pulsed micro flow sensor comprising determining positions to allocate a plurality of thermal sensors along a microchannel, relatively to a heater...
6386050 Non-invasive fluid flow sensing based on injected heat tracers and indirect temperature monitoring  
A system and method for measuring flow rate within a fluid-bearing passageway include introducing heat fluctuations into the flow and then non-invasively monitoring the effects of the heat...
6289746 Thermal pulsed micro flow sensor  
A thermal pulsed micro flow sensor includes thermal sensors positioned in a fluid channel at downstream positions relative to a heater. Flow rate is measured by determining the time that it takes a...
6272919 Method for measuring a gas flow rate and a gasmeter therefore  
Gasmeter for determining a flow rate of gas within a channel is provided. The gasmeter includes a channel for passing through it a flow of gas along a first sensor and a chamber which is arranged...
6089103 Method of flow measurements  
A system and method for measuring flow of a fluid flowing in a narrow channel. A sensor is provided, having an element sensitive to pressure, and an element sensitive to a selected chemical or...
6035726 Hot-wire mass flowmeter  
A mass flowmeter including a resistive wire adapted to be placed across the path of a fluid whose flow rate is to be measured, a controller unit for applying electrical energy to the wire, and a...
5860922 Determining blood flow by measurement of temperature  
A method for determining a flow rate of a substance or a thermo-contrast agent in an object including a surface and an upstream region, and the method comprising the steps of (a) providing the...
5719341 Apparatus for measuring fluid flow velocity by injecting liquified gas  
An apparatus for measuring fluid flow velocity includes structure for varying an energy content of a volume of a fluid at a first pre-selected point to the flow path and structure for detecting the...
5700431 Method and a device for monitoring the internal circulation in a fluidized bed reactor, and a reactor provided with such a device  
A monitoring device for continuously monitoring the internal circulation flow-rate of solid particles in a circulating fluidized bed reactor including a bottom zone into which the fluidization gas...
5698795 Thermal time of flight signal guard  
The thermal time of flight signal guard overcomes the leakage crosstalk problem encountered in prior art systems by eliminating the leakage currents in the flow transducer before they reach the...
5692510 Determining coronary blood flow by cardiac thermography in open chest conditions  
Methods for determining the flow rate of a substance within an object by extracting and mathematically manipulating numerical parameters from a thermoimaging temperature response curve of the...
5646354 Microwave thermal trace flowmeter  
A flowmeter is based on the principle of injecting a pulse of microwave radiation into a flowing stream of material containing a substance having an absorption band for the radiation so as to heat...
5533412 Pulsed thermal flow sensor system  
A precise fluid flow meter fabricated by micromachining techniques measures a wide range of fluid flow rates. Two serial portions of an enclosed channel have different cross-sectional areas, and...
5526696 Flow meters  
A temperature probe 3 determines the instantaneous ambient temperature of a multiphase fluid 2 flowing through a pipe 1, and at a position further downstream there is an inlet 4 for water at a...
5347876 Gas flowmeter using thermal time-of-flight principle  
A temperature time-of-flight (TOF) sensor is combined with a nozzle of known flow area to create a TOF flowmeter. The TOF measured by the flow sensor provides a measure of gas volumetric flow rate....
5339695 Fluidic gas flowmeter with large flow metering range  
The present invention provides a wide range fluid flowmeter, having a body with a central air flow passage and a target in the air flow passage to direct fluid flow to one of the first and second...
5335555 Volume flow meter that measures transit time  
An aerodynamic enclosure is placed in the flow, the enclosure including an opening enabling the enclosure to be filled with the flowing fluid, and having a thermal pulse generator mounted flush...
5333674 Method for measuring the cleaning effectiveness of cleaning bodies on heat exchangers  
The invention concerns a method for measuring the cleaning effectiveness of cleaning bodies (20) on heat exchangers having a bunch of tubes (16). Further, a method and a plant is proposed with...
5311775 Semiconductor flow sensor  
The flow rate sensor is made from a silicon substrate (1). A first face (A) of the substrate is provided with a heating element (2) disposed in a first region (R1) and with at least one thermometer...
5263380 Differential AC anemometer  
An apparatus comprises a sensor including a heater, an upstream detector and a downstream detector. An AC signal source excites the heater to generate propagating heat signals that are received by...
5260665 In-line fluid monitor system and method  
A non-invasive, in-line fluid monitor includes a segment of fluid line disposed such that it and the fluid within become a part of the dielectric loading on an energized electromagnetic sensor...
5255977 Method and device for monitoring the efficiency of a condenser  
The invention relates to a method and to an apparatus for monitoring the heat transfer and therefore the efficiency of a condenser. A water column is formed by shutting off a condenser pipe which...
5243858 Fluid flow sensor with thermistor detector  
An airflow sensor formed on a silicon chip comprises a silicon base covered with an insulating polyimide layer, a lineal resistance heater on the chip energized with current pulses to propagate...
5226333 Deep-well thermal flowmeter  
The flowmeter includes a planar wire grid immersed in the fluid flow perpendicular to the direction of fluid flow. Capacitors discharge an electrical current through the wire grid to heat the wire...
5026171 Apparatus for flow rate and energy transfer measurements  
Temperaature sensors at the inlet and outlet of a heat exchanger are utilized in the disclosed apparatus to measure the temperature of the fluid and to ascertain the the time taken by a localized...
4938079 Thermal transit time flow measurement system  
The apparatus accurately measures flow rate of fluid within a conduit without direct fluid contact, based on the introduction of a thermal marker into the fluid stream by means of at least one...
4932250 Multi point sensor  
The invention provides a thermocouple device comprising a base wire 1 and a plurality of junctions 3 spaced along said wire, each of said junctions being connected to a monitoring means which...
4813280 Thermal pulse flow meter with disposable cell  
A disposable flow cell for use in a thermal pulse flow meter of the type that incorporates a pulse heated thermal probe and a detecting thermal probe. The disposable cell has two side ports covered...
4713970 Thermal diffusion fluid flow sensor  
A miniature solid state fluid flow sensor has a low diffusivity substrate, such as a polymer film, which is optionally mounted on a thermally conductive base. A resistor strip on the substrate is...
4628743 Apparatus and method for metering sub-10 cc/minute liquid flow  
Apparatus for accurately metering liquid flow based on the injection of a brief heat pulse into the flowing stream, e.g., via a miniature thermistor, and detection of an electronic time derivative...
4532811 Apparatus for metering sub-10 cc/minute liquid flow  
Apparatus for accurately metering liquid flow based on the injection of a brief heat pulse into the flowing stream, e.g., via a miniature thermistor, and detection of an electronic time derivative...
4502339 Thermal pulse emitter or detector element  
Disclosed is an emitting or detecting element for an in-line flow measuring instrument operating on the thermopulse-injection and transit time measuring principle. The element is composed of a...
Matches 1 - 50 out of 65 1 2 >