GB1489874A - Apparatus and methods of measuring fluid flow - Google Patents
Apparatus and methods of measuring fluid flowInfo
- Publication number
- GB1489874A GB1489874A GB5749773A GB5749773A GB1489874A GB 1489874 A GB1489874 A GB 1489874A GB 5749773 A GB5749773 A GB 5749773A GB 5749773 A GB5749773 A GB 5749773A GB 1489874 A GB1489874 A GB 1489874A
- Authority
- GB
- United Kingdom
- Prior art keywords
- signal
- flow
- output
- rate
- differentiator
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
- G01F1/68—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using thermal effects
- G01F1/684—Structural arrangements; Mounting of elements, e.g. in relation to fluid flow
- G01F1/6847—Structural arrangements; Mounting of elements, e.g. in relation to fluid flow where sensing or heating elements are not disturbing the fluid flow, e.g. elements mounted outside the flow duct
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
- G01F1/68—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using thermal effects
- G01F1/696—Circuits therefor, e.g. constant-current flow meters
Landscapes
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- General Physics & Mathematics (AREA)
- Measuring Volume Flow (AREA)
Abstract
1489874 Measuring temperature and mass flow electrically NATIONAL RESEARCH DEVELOPMENT CORP 11 Dec 1974 [12 Dec 1973] 57497/73 Heading G1N Relates to compensating for thermal inertia in a fluid-flow meter of the type in which a fluid passing along a duct 10 is heated (by a coil 11) and the temperatures upstream and downstream of the heater are measured by thermistors 12, 13 or other temperature sensors connected in a bridge circuit 12-15, the output signal of which represents the flow-rate. A change in the flow-rate results in an exponential change in the signal to a final value representative of the new flow-rate. The first differential of the signal, multiplied by the time constant of the exponential change, is added to the signal to give a total signal to an indicator 20 or 31 which reaches the new value of the signal much more rapidly than the signal itself. In Fig. 1, the bridge output feeds a differential amplifier 16 which supplies a differentiator 17 and an adder 19, the output of the differentiator passing via an inverter 18 to a second input of the adder 19. The units 16-19 can each be made of the same type of integrated operational amplifier connected in respective known ways. In Fig.3, the bridge output is connected via a resistor 27 to a high gain amplifier 26 having a tapped resistive feedback 28, 29, with a capacitor 30 connected between the tapping point and earth.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB5749773A GB1489874A (en) | 1974-12-11 | 1974-12-11 | Apparatus and methods of measuring fluid flow |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB5749773A GB1489874A (en) | 1974-12-11 | 1974-12-11 | Apparatus and methods of measuring fluid flow |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1489874A true GB1489874A (en) | 1977-10-26 |
Family
ID=10479328
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB5749773A Expired GB1489874A (en) | 1974-12-11 | 1974-12-11 | Apparatus and methods of measuring fluid flow |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB1489874A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4972702A (en) * | 1988-09-02 | 1990-11-27 | Aisan Kogyo Kabushiki Kaisha | Intake air quantity measuring apparatus |
-
1974
- 1974-12-11 GB GB5749773A patent/GB1489874A/en not_active Expired
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4972702A (en) * | 1988-09-02 | 1990-11-27 | Aisan Kogyo Kabushiki Kaisha | Intake air quantity measuring apparatus |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PS | Patent sealed | ||
PCNP | Patent ceased through non-payment of renewal fee |