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Ultrasonic flow meter with reduced noise

The flow rate of a fluid can be measured using an ultrasonic flow meter according to the present invention with a higher measuring accuracy and a lower cost. The feature of the invention consists in an ultrasonic flow meter comprising a measurement tube for flowing a fluid to be subjected to measurement, a first oscillator fitted to the outer circumference of the measurement tube, a second oscillator fitted to the outer circumference of the measurement tube at a predetermined interval along the flow of the fluid from the first oscillator and an acoustic filter fitted to the measurement tube for cutting high frequency range of the oscillating wave propagating through the oscillating tube, in which the flow rate of a fluid is measured based on a time difference between a time required when the ultrasonic wave from the upstream oscillator reaches the downstream oscillator and another time required when the ultrasonic wave from the downstream oscillator reaches the upstream oscillator.

Mass air flow meter

Improvement in a mass air flow meter having a static pressure manifold disposed upstream from an air flow path for sample air and capable of accumulating a volume of air therein, the flow path constructed to receive an air flow transducer, the static pressure manifold having an inlet arrangement in communication with the kinematic main air flow traveling through the meter so as to be capable of sensing different static pressures thereof, the static pressure manifold having a single outlet serving as the sole inlet for the sample air to be measured by the air flow transducer, the static pressure of the air accumulated in the static pressure manifold being such that it functions as a resultant average of the different static pressures sensed at its inlet arrangement, the static pressure manifold providing substantial immunity for the meter in respect to turbulent air flow upstream therefrom.

Claims

Method of measuring flow rates of respective fluids constituting multiphase fluid and flow meter for multiphase flow utilizing same

A flow meter for a multiphase flow which comprises a cross-correlation flow meter (26) for measuring basic values to calculate component ratios of respective fluids constituting a multiphase fluid (2) comprising a gas and a plurality of liquids in a pipe (1) through which the multiphase fluid flows; and an arithmetic circuit (22) for calculating flow rates of the respective fluids, which acquires information concerning ratios of liquid phase components of the multiphase fluid (2) on the basis of both measured values obtained by the cross-correlation flow meter (26) at an instance when the pipe (1) is filled with liquid alone during the passage of the multiphase fluid (2) through the pipe (1) provided with the cross-correlation flow meter (26) and characteristic values of the respective fluids of the multiphase fluid (2), acquires information concerning ratios of the respective fluids from a time average of the measurements obtained by the cross-correlation flow meter (26) and the respective characteristic values, then obtains the component ratios of the respective fluids by utilizing the fact that a sum of the component ratios of the respective fluids becomes (1), calculates an average flow velocity of the multiphase fluid (2) from time between fluctuations of the measured values obtained by the cross-correlation flow meter (26), and calculates flow rates of the respective fluids by utilizing the respective component ratios and the average flow velocity.

Symmetrical ultrasound gas flow meter housing and related multi-configuration gas flow meter assembly

An ultrasonic gas meter housing member is configured to provide an associated multi-configuration ultrasonic gas meter assembly. The housing member is installable in an ultrasonic gas flow meter which includes an internal flow measurement tube along which gas travels for flow measurement, the tube having an inlet end and an outlet end. The ultrasonic gas meter housing member includes a closed back portion and a front portion spaced from the back portion to define a space for receiving the internal flow measurement tube such that the tube extends across the internal space of the housing member. At least one wall portion extends between the back portion and the front portion, the wall portion having a first opening and a second opening therethrough for connection of the housing member to a gas inlet pipe and a gas outlet pipe. The gas meter housing member is symmetrical about a plane which divides the housing member into a first portion and a second portion. The symmetrical configuration enables the housing member to receive the flow measurement tube in both a first orientation in which the first and second opening face in a first direction and the inlet end of the flow measurement tube is positioned in the first portion of the housing member and the outlet end is positioned in the second portion, and a second orientation in which the first and second opening face in a second direction substantially perpendicular to the first direction and the inlet end of the flow measurement tube is positioned in the second portion of the gas meter housing member and the outlet end is positioned in the first portion. The first and second orientations are particularly useful in enabling the housing member to be used both in gas meter installation sites where the gas pipes extend downward and in gas meter installation sites where the gas pipes extend upward.


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
101 6490933 Ultrasonic flow meter with reduced noise
102 6467359 Mass air flow meter
103 6467358 Method of measuring flow rates of respective fluids constituting multiphase fluid and flow meter for multiphase flow utilizing same
104 6453757 Symmetrical ultrasound gas flow meter housing and related multi-configuration gas flow meter assembly
105 6435036 Vortex flow meter
106 6422092 Multiple-phase flow meter
107 6404344 Method of compensating for erroneous reading in a mass flow meter
108 6386030 Balanced bridge temperature regulator for an air-mass flow meter
109 6357293 Air flow meter with heat generating resistor
110 6354275 Thermal air flow meter
111 6354150 Sensor for a capillary tube of a mass flow meter
112 6345540 Fluid flow meter
113 6345538 Dual chamber ultrasonic flow meter with membranes having equal pressure on opposite sides thereof
114 6345536 Multiple-phase flow meter
115 6336370 Coriolis mass flow meter with thick wall measuring tube
116 6336369 Straight double-tube type coriolis flow meter
117 6332366 Coriolis flow meter with adjustable excitation phase
118 6318169 Heat sensitive flow meter
119 6272918 Thermal flow meter and fuel controller
120 6263684 Refrigerant flow meter
121 6260420 Inductive flow meter signal line and electrode arrangement
122 6250167 Removable radio frequency sensor assembly for a turbine flow meter
123 6250151 Fluid flow meter incorporating magnetic detector
124 6244115 Flow meter for monitoring liquid flow at low or intermittent rates
125 6220090 Air flow meter
126 6212959 Hydration insuring system comprising liquid-flow meter
127 6209402 Measuring element, mass air flow meter therewith and compensating method for accurately measuring air flow
128 6158290 Mass flow meter
129 6119529 Fluid flow meter and corresponding flow measuring methods
130 6098467 Acoustic flow meter wherein false readings are identified dependent on upstream and downstream acoustic transit times
131 6094994 Impact type flow meter with trough-like material supply device having a built in supply opening
132 6089264 Flow meter
133 6085586 Flow meter system with remote displays for each discharge
134 6079279 Suspended-body flow meter
135 6065351 Flow rate measurement method and ultrasonic flow meter
136 6063034 Blood flow meter apparatus and method of use
137 6055868 Ultrasonic flow meter
138 RE36658 Fluid flow meter
139 6041665 Mass flow meter which operates according to the coriolos principle
140 RE36597 Apparatus and method for measuring two- or three-phase fluid flow utilizing one or more momentum flow meters and a volumetric flow meter
141 6032541 Suspended body flow meter
142 6032528 Flow meter having cylinders with freely movable pistons therein
143 6032526 Heating resistor type air flow-meter of ratio-metric output type and engine control system using said heating resistor type air flow-meter
144 6009760 Method of measuring flow, and flow meter
145 5992230 Dual rotor flow meter
146 5986553 Flow meter that measures solid particulate flow
147 RE36376 Stability coriolis mass flow meter
148 5974897 Ultrasonic flow meter
149 5965800 Method of calibrating an ultrasonic flow meter
150 5952571 Thermal type flow meter

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