Patent US4317178A successfully refreshed from Google Patents.
US4317178A
Expired / Lapsed
US
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Multiple velocity traverse flow rate measuring technique
Assignee: BA BUSINESS CREDIT Inc
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Filing: 1979-03-01
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Granted: 1982-02-23
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Expires: 1999-03-01
Abstract
Abstract A method and systems based thereon for conducting a multiple velocity traverse of a flow stream cross section of known shape and area to determine flow therethrough. The technique employs any one of the known methods of numeral integration to place the traverse chords and weight the chord average velocities, the technique being applicable to flow streams of any known cross-sectional shape and area without requiring that the chords be parallel.
Inventors
- 👤 Victor P. Head
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 01:20
CPC Classifications
G; G01; G01F; G01F1/00; G01F1/05; G01F1/34; G01F1/36; G01F1/363; G01F1/053; G01F1/66; G01F1/667; G01F1/68; G01F1/684
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
165 words
A system for measuring volumetric flowrate through a stream cross section of known shape and Area A comprising: (a) means for measuring line-average velocity u i on a plurality of n chords traversing said cross section so as to partition said area into predetermined fractional areas a i ; said chords being positioned so as to partition said Area A into said predetermined fractional areas a i as measured within said cross section between a reference line bisecting the Area A and each of said chords, the predetermined fractional areas being chosen to be predetermined fractions x i of the semi-areas A/2; said predetermined area fractions x i and weight factors w i being chosen to be equal to the abscissas x i and weight factors w i of one of the following methods of numerical integration: (i) Gaussian Integration (ii) Chebyshev Integration (iii) Lobatto Integration (b) data processing means coupled to said measuring means and yielding volumetric flowrate Q according to the computation ##EQU17##
Claim 2
Independent Claim
165 words
A system for measuring volumetric flowrate through a stream cross section of known shape and Area A comprising: (a) means for measuring line-average velocity u i on a plurality of n chords traversing said cross section so as to partition said area into predetermined fractional areas a i ; said chords being positioned so as to partition said Area A into said predetermined fractional areas a i as measured within said cross section between a reference line bisecting the Area A and each of said chords, the predetermined fractional areas being chosen to be predetermined fractions x i of the semi-areas A/2; said predetermined area fractions x i and weight factors w i being chosen to be equal to the abscissas x i and weight factors w i of one of the following methods of numerical integration: (i) Gaussian Integration (ii) Chebyshev Integration (iii) Lobatto Integration (b) data processing means coupled to said measuring means and yielding volumetric flowrate Q according to the computation ##EQU17##
Claim 3
Dependent Claim
21 words
A system according to claim 1, wherein said means for measuring line average velocity u i includes point velocity measuring means.
Claim 4
Dependent Claim
26 words
A system according to claim 2, wherein said point velocity measuring means includes means for measuring the difference between a stagnation pressure and a static pressure.
Claim 5
Dependent Claim
22 words
A system according to claim 2, wherein said point velocity measuring means includes propeller type current meter means for liquid velocity sensing.
Claim 6
Dependent Claim
21 words
A system according to claim 2, wherein said point velocity measuring means includes rotating type anemometer means for gas velocity sensing.
Claim 7
Dependent Claim
19 words
A system according to claim 2, wherein said point velocity sensing means includes thermal type hot-wire or hot-film means.
Claim 8
Dependent Claim
16 words
A system according to claim 2, wherein said point velocity sensing means includes doppler velocimeter means.
Claim 9
Dependent Claim
17 words
A system according to claim 2, wherein said point velocity sensing means includes acoustic doppler velocimeter means.
Claim 10
Dependent Claim
35 words
A system according to claim 1, wherein said means for measuring line average velocity u i includes means for detecting vector variations in velocity of an acoustic ray caused by addition of the vector u.
Claim 11
Dependent Claim
32 words
A system according to claim 9, wherein said means for detecting vector variations comprises means for detecting the angular magnitude of an acoustic beam deflection caused by the vector u i .
Claim 12
Dependent Claim
30 words
A system according to claim 9, wherein said means for detecting vector variations comprises means for detecting changes in acoustic propagation velocity magnitudes caused by the vector u i .
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-02-22 | 1985-08-24 | 1986-02-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-02-22 | 1989-08-24 | 1990-02-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-02-22 | 1993-08-24 | 1994-02-23 | $7700.00 | Window Closed / Lapsed |