GB1489874A - Apparatus and methods of measuring fluid flow - Google Patents

Apparatus and methods of measuring fluid flow

Info

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
Application number
GB5749773A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
National Research Development Corp UK
Original Assignee
National Research Development Corp UK
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by National Research Development Corp UK filed Critical National Research Development Corp UK
Priority to GB5749773A priority Critical patent/GB1489874A/en
Publication of GB1489874A publication Critical patent/GB1489874A/en
Expired legal-status Critical Current

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

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.
GB5749773A 1974-12-11 1974-12-11 Apparatus and methods of measuring fluid flow Expired GB1489874A (en)

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)

* Cited by examiner, † Cited by third party
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

Cited By (1)

* Cited by examiner, † Cited by third party
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