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Cross correlation fluid flow meter

A cross correlation fluid flow meter including a body having first and second sensor devices positioned such that in use they are spaced apart a known distance in the direction of fluid flow, each sensor device having a signal transmitter and a signal receiver. According to one embodiment of the flow meter, the signal transmitter of the first sensor device is operable to transmit signals at a first frequency and the signal receiver of the first sensor device is arranged to receive signals at the first frequency. The signal transmitter of the second sensor device is operable to transmit a second signal at a second frequency and the signal receiver of the second device is operable to receive signals at the second frequency, the first and second frequencies being different from one another. The first sensor is non-responsive to the second frequency and the second sensor is non-responsive to the first frequency. Cross correlation of the received signals provides an indication of the fluid flow rate.

Hall effect fluid flow switch and flow meter

A fluid flow monitoring system comprised of a permanent magnet mounted on a bendable spring blade that provide an output from a Hall effect transducer as the permanent magnet is deflected toward or away from the transducer. The permanent magnet can be mounted to directly approach the Hall effect transducer or can also be mounted to approach the transducer by a sideways bypass direction. Both the direct motion and sideways bypass direction allows the use of a variety of sizes and shapes of magnets that allow the magnetic field intensity to be modified in any way desired. Various magnet shapes such as cylinders, rectangles, pyramids, triangles or compound magnets from these shapes may be used. The output signal of the transducer is processed through a smoothing filter and circuits that produce a linear output or a stepped digital output. The system preferably uses a resistance/capacitance filter to provide a different time constant for an increasing flow or a decreasing flow. The output can be used as a flow switching circuit or as a flow meter, or as a flow quantity totalizer.

Heat flow meter instruments

An apparatus, such as, a heat flow meter instrument, for measuring thermal properties of a specimen includes a first thermoelectric device and a second thermoelectric device, each device being thermally coupled to a hot plate and a cold plate, and a heat flow transducer, thermally connectable to a specimen and constructed to measure heat flowing through the specimen. The heat flow transducer and the specimen are positionable in thermal contact between the hot plate of the first thermoelectric device and the cold plate of the second thermoelectric device. The apparatus also includes an electric power supply connected to provide controlled amounts of electric power to the first and second thermoelectric devices to maintain the plates at selected temperatures, and a processor connected to receive from the heat flow transducer a signal corresponding to the measured heat. The processor is programmed to calculate a thermal property of the specimen based on the temperatures and the measured heat. The apparatus includes a closed loop heat exchange system, thermally connecting the cold plate of the first thermoelectric device and the hot plate of the second thermoelectric device, constructed and arranged to transfer heat between the plates. The closed loop heat exchange system may include a fluid pump and a first set of conduits thermally connected to the cold plate of the first thermoelectric device and a second set of conduits thermally connected to the hot plate of the second thermoelectric device. The conduits convey a heat exchange fluid in a closed loop arrangement.

Photo detector bending beam flow switch and flow meter

A photo detecting flow sensing bending beam fluid flow switch and flow meter system having blocking targets that selectively block the optical path from an emission source to a photodetector. The device provides a system which is very sensitive to fluid flow in a pipe, container or duct by providing a shaped flexible flow sensitive bending beam having a blocking target which is bent so that the portion of the blocking target is displaced between the emission source and a photodetector. The shaped blocking target is configured to either interrupt or permit the transmission of emission from the emitter to the photodetector. The presence or absence of the source represents the presence or absence of a fluid flow rate above or below a selected value thus, performing a fluid flow switch function. By modifying the blocking target to provide a reflective control from an emission to a photo detector or an absorption of the emission by a target varying in opacity, the relative light output is continuously modulated to produce a voltage output directly proportional to the rate of fluid flow past the target on a flow sensitive bending beam. In an optional embodiment, flow sensitivity is improved by adding vortex shedding enhancements to the flow sensitive bending beam. This combination of functional elements can provide an analog fluid flow meter transducer for flow metering, totalizing in a flow monitoring system having single or multiple flow switching set points.


Retrievable downhole flow meter
Capacitative electromagnetic flow meter
Ultrasonic flow meter with reduced noise
Coriolis mass flow meter having a thick-walled measuring tube
Detector for an ultrasonic flow meter
Karman vortex flow meter
Coriolis mass flow meter employing non-metallic flow conduit structure
Fluidic volumetric fluid flow meter
Electromagnetic flow meter
Fluid flow meter utilizing pressure sensing
Air flow meter
Fluid flow meter
Liquid flow meter construction
Positive displacement flow meter method and apparatus
Magnetic-inductive flow meter with a measuring tube made of plastic


PAT. NO. Title
151 5948995 Cross correlation fluid flow meter
152 5945608 Hall effect fluid flow switch and flow meter
153 5940784 Heat flow meter instruments
154 5932814 Photo detector bending beam flow switch and flow meter
155 5918285 Coriolis mass flow meter having a thick-walled measuring tube
156 5913250 Pressure compensated thermal flow meter
157 5911219 Therapeutic gas flow meter and monitor
158 5908991 Karman vortex flow meter
159 5907104 Signal processing and field proving methods and circuits for a coriolis mass flow meter
160 5895866 Micromachined silicon micro-flow meter
161 5892158 Method for installing a flow meter system and flow meter apparatus therefor
162 5892146 Heating resistor type air flow meter with a measuring module inside the main air flow passage body
163 5890515 Flow control valve with a flow meter
164 5877430 Pressure measuring system for gas flow meter
165 5877429 Flow meter
166 RE36069 Portable wastewater flow meter
167 5865749 Blood flow meter apparatus and method of use
168 5847288 Photo detector bending beam flow switch and flow meter
169 5847286 Magnetically inductive flow meter for flowing media
170 5844658 Eye fundus tracking apparatus and eye fundus blood flow meter using the same
171 5837902 Cross correlation fluid flow meter
172 5827976 Fluidic flow meter with fiber optic sensor
173 5824915 Volumetric flow meter
174 5824895 Air flow meter of a heating resistor type
175 5824879 Method of calibrating an ultrasonic flow meter
176 5817949 Ultrasonic flow meter and method
177 5811689 Fluid flow meter
178 5808208 Inductive flow meter
179 5808196 Blocking rotor and housing for flow meter
180 5807259 Ultrasonic continuous wave doppler blood flow-meter
181 5804742 Mass flow meter
182 5804741 Digital phase locked loop signal processing for coriolis mass flow meter
183 5798466 Flow meter and method of calibrating same
184 5777237 Fluid flow meter
185 5773727 Mass flow meter
186 5767419 Hall effect fluid flow switch and flow meter
187 5763774 Fluid flow meter with reduced orientation sensitivity
188 5760301 Flow meter for a gas pressure regulator
189 5756893 Thermal flow meter
190 5753826 Flow meter having a vibration dampener
191 5751535 Control circuits for an electromagnetic flow meter
192 5750902 Magnetoinductive flow meter
193 5747700 Portable electronic flow meter
194 5741977 High void fraction multi-phase fluid flow meter
195 5741964 Apparatus and method for detecting abnormality of air flow meter
196 5736653 Coriolis-type mass flow meter with at least one measuring tube
197 5729180 Control of VCO in ultrasonic flow meter
198 5728946 Karman vortex flow meter
199 5721383 Flow meter system and method of using same
200 5720277 Ventilator/Anaesthetic system with juxtaposed CO.sub.2 meter and expired gas flow meter

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