US3774448A
Expired / Lapsed
US
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Fluid flow compensating method and system
Assignee: Halliburton Co
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Filing: 1972-06-15
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Granted: 1973-11-27
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Expires: 1992-06-15
Abstract
Abstract A method and apparatus for generating an output signal selectively displaced in phase from an input signal wherein the phase displacement remains the same irrespective of changes in the input signal frequency. A reference signal related in amplitude to the frequency of the input signal and a comparing signal which varies at a predetermined rate for a period of time related to the frequency of the input signal are compared, and a pulse is generated in response to the comparison. More specifically, a capacitor is charged and discharged from alternately enabled positive and negative constant current sources during successive interpulse periods of the input signal. The voltage on the capacitor is stored at the end of each charging period and the varying voltage across the capacitor is compared with one or more percentages of the stored voltage to generate output pulses. The output pulses may be combined with the input signal to provide frequency multiplication or the percentage may be made variable to provide variable phase shifting. A system for increasing the resolution of measurements obtained from a digital transducer and a system for generating selectively phase shifted control signals are also disclosed.
Inventors
- 👤 E Gass
- 👤 F Paramore
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 09:58
CPC Classifications
G; G06; G06F; G06F7/00; G06F7/60; G06F7/68; G01; G01F; G01F1/00; G01F1/05; G01F1/10; G01F1/12; G01F1/125; G01F15/00; G01F15/02; G01F15/022; G01F15/024
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
204 words
A system for monitoring the condition of fluid flowing through a conduit comprising: a flowmeter means for providing first series of pulses having a repetition frequency related to the flow of the fluid through the conduit; condition responsive transducer means for providing a second series of pulses having a repetition frequency related to a variable physical condition of the fluid flowing through the conduit; means for providing a reference signal related in amplitude to the repetition frequency of at least one of the first and second series of pulses; means for providing a comparing signal having an amplitude which varies at a predetermined rate for a period of time related in duration to the repetition frequency of said at least one of the series of pulses; means for symmetrically adding at least one pulse intermediate adjacent pulses of said at least one of the series of pulses responsively to a comparison between said comparing signal and said reference signal; and, means responsive to the first and second series of pulses as modified bY said adding means for providing packets of pulses wherein the number of packets is related to flow and the number of pulses in each packet is related to the fluid condition.
Claim 2
Independent Claim
204 words
A system for monitoring the condition of fluid flowing through a conduit comprising: a flowmeter means for providing first series of pulses having a repetition frequency related to the flow of the fluid through the conduit; condition responsive transducer means for providing a second series of pulses having a repetition frequency related to a variable physical condition of the fluid flowing through the conduit; means for providing a reference signal related in amplitude to the repetition frequency of at least one of the first and second series of pulses; means for providing a comparing signal having an amplitude which varies at a predetermined rate for a period of time related in duration to the repetition frequency of said at least one of the series of pulses; means for symmetrically adding at least one pulse intermediate adjacent pulses of said at least one of the series of pulses responsively to a comparison between said comparing signal and said reference signal; and, means responsive to the first and second series of pulses as modified bY said adding means for providing packets of pulses wherein the number of packets is related to flow and the number of pulses in each packet is related to the fluid condition.
Claim 3
Dependent Claim
38 words
The system of claim 1 wherein said reference signal and said comparing signal are generated responsively to the first series of pulses and wherein said added pulse is added between adjacent pulses in said first series of pulses.
Claim 4
Dependent Claim
38 words
The system of claim 1 wherein said reference signal and said comparing signal are generated responsively to the second series of pulses and wherein said added pulse is added between adjacent pulses in said second series of pulses.
Claim 5
Dependent Claim
66 words
The system of claim 1 wherein said means for providing said reference signal includes: means for charging a capacitor at a predetermined rate for a period of time related to the duration of the period of the series of pulses to which said reference signal providing means is responsive; and, means for storing the voltage on said capacitor at the end of said period of time.
Claim 6
Dependent Claim
30 words
The system of claim 4 wherein said means for providing said comparing signal includes means for charging and discharging said capacitor at said predetermined rate for said period of time.
Claim 7
Dependent Claim
54 words
The system of claim 1 wherein said reference signal providing means includes means for selecting a plurality of different percentages of the amplitude of said reference signal and wherein said adding means includes means for generating a signal when the amplitude of said comparing signal is substantially equal to each of said selected percentages.
Claim 8
Independent Claim
217 words
A method of compensating a manifestation of fluid flow for a variable physical condition of the fluid comprising the steps of: providing a first series of pulses having a pulse repetition rate related to the fluid flow; providing a second series of pulses having a pulse repetition rate related to the variable physical condition of the fluid; providing a first reference signal responsively to every second pulse in the first series of pulses, the first reference signal being related in amplitude to the pulse repetition rate of the first series of pulses; providing a second reference signal variable in amplitude at a substantially linear rate for periods of time related in duration to the pulse repetition rate of the first series of pulses; comparing said second reference signal with at least one predetermined percentage of the first reference signal to provide an output pulse when the amplitudes of the compared signals are substantially equal; combining the output pulses with the first series of pulses to thereby increase the pulse repetition rate of the first series of pulses; and, providing packets of pulses related in number to the increased pulse repetition rate of the first series of pulses, the number of pulses in the packets being related to the pulse repetition rate of the second series of pulses.
Claim 9
Independent Claim
217 words
A method of compensating a manifestation of fluid flow for a variable physical condition of the fluid comprising the steps of: providing a first series of pulses having a pulse repetition rate related to the fluid flow; providing a second series of pulses having a pulse repetition rate related to the variable physical condition of the fluid; providing a first reference signal responsively to every second pulse in the first series of pulses, the first reference signal being related in amplitude to the pulse repetition rate of the first series of pulses; providing a second reference signal variable in amplitude at a substantially linear rate for periods of time related in duration to the pulse repetition rate of the first series of pulses; comparing said second reference signal with at least one predetermined percentage of the first reference signal to provide an output pulse when the amplitudes of the compared signals are substantially equal; combining the output pulses with the first series of pulses to thereby increase the pulse repetition rate of the first series of pulses; and, providing packets of pulses related in number to the increased pulse repetition rate of the first series of pulses, the number of pulses in the packets being related to the pulse repetition rate of the second series of pulses.
Claim 10
Dependent Claim
69 words
The method of claim 7 wherein the first reference signal is provided by the steps of: providing a signal variable in amplitude at a substantially linear rate from a time related to the occurrence of a pulse in the first series of pulses; and, sampling the amplitude of the variable signal at a time related to the occurrence of the next succeeding pulse in the first series of pulses.
Claim 11
Dependent Claim
22 words
The method of claim 8 wherein the variable amplitude signal is provided by the application of a constant current to a capacitor.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-11-26 | 1977-05-28 | 1977-11-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-26 | 1981-05-28 | 1981-11-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-26 | 1985-05-28 | 1985-11-27 | $7700.00 | Window Closed / Lapsed |