US3844170A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Flow velocity measurement
Assignee: Individual
•
Filing: 1973-01-26
•
Granted: 1974-10-29
•
Expires: 1993-01-26
Abstract
Abstract A method of detecting the velocity of a flow which comprises deriving from each of a first pair of positions spaced apart in the direction of flow a signal corresponding to radiative noise in the flowing system, multiplying said signals together and either auto-correlating the product or cross-correlating the product with the product signal obtained by multiplying together further signals corresponding to radiative noise in the flowing system and derived from each of a second pair of positions spaced apart in the direction of flow.
Inventors
- 👤 D Critten
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 17:50
CPC Classifications
G; G01; G01P; G01P5/00; G01P5/24; G01F; G01F1/00; G01F1/704; G01F1/708; G01F1/712
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
45 words
A method of detecting the velocity of a flow which comprises deriving from each of a first pair of positions spaced apart in the direction of flow a signal corresponding to radiative noise in the flowing system, multiplying said signals together and auto-correlating the product.
Claim 2
Independent Claim
45 words
A method of detecting the velocity of a flow which comprises deriving from each of a first pair of positions spaced apart in the direction of flow a signal corresponding to radiative noise in the flowing system, multiplying said signals together and auto-correlating the product.
Claim 3
Dependent Claim
20 words
A method as claimed in claim 1 in which the flow is that of a system constrained within a duct.
Claim 4
Dependent Claim
24 words
A method as claimed in claim 1 in which the radiative noise comprises acoustic radiation generated by random fluctuations in a flowing fluid system.
Claim 5
Dependent Claim
44 words
A flow meter comprising means for deriving from each of a pair of positions spaced apart in the direction of flow a signal corresponding to radiative noise in the flowing system, a multiplier for multiplying the signals together, and means for auto-correlating the product.
Claim 6
Dependent Claim
44 words
A flow meter comprising means for deriving from each of a pair of positions spaced apart in the direction of flow a signal corresponding to radiative noise in the flowing system, a multiplier for multiplying the signals together, and means for auto-correlating the product.
Claim 7
Dependent Claim
27 words
A flow meter as claimed in claim 4 in which the means for deriving the signals corresponding to radiative noise in the flowing system are acoustic-to-electric transducers.
Claim 8
Dependent Claim
19 words
A flow meter as claimed in claim 4 adapted to measure flow of a systeM constrained within a duct.
Claim 9
Dependent Claim
100 words
A flow meter comprising means for deriving from a first pair of positions spaced apart in the direction of flow a respective first pair of signals corresponding to radiative noise in the flowing system, means for deriving from a second pair of positions spaced apart in the direction of flow a respective second pair of signals corresponding to radiative noise in the flowing system, a first multiplier for multiplying together said first pair of signals, a second multiplier for multiplying together said second pair of signals, and a cross-correlator for cross-relating the product signals from said first and second multipliers.
Claim 10
Dependent Claim
100 words
A flow meter comprising means for deriving from a first pair of positions spaced apart in the direction of flow a respective first pair of signals corresponding to radiative noise in the flowing system, means for deriving from a second pair of positions spaced apart in the direction of flow a respective second pair of signals corresponding to radiative noise in the flowing system, a first multiplier for multiplying together said first pair of signals, a second multiplier for multiplying together said second pair of signals, and a cross-correlator for cross-relating the product signals from said first and second multipliers.
Claim 11
Dependent Claim
27 words
A flow meter as claimed in claim 7 in which the means for deriving the signals corresponding to radiative noise in the flowing system are acoustic-to-electric transducers.
Claim 12
Dependent Claim
19 words
A flow meter as claimed in claim 7 adapted to measure flow of a system constrained within a duct.
Claim 13
Independent Claim
80 words
A method of detecting the velocity of a flow which comprises deriving from each of a first pair of positions spaced apart in the direction of flow a signal corresponding to radiative noise in the flowing system, multiplying said signals together and cross-correlating the product with the product signal obtained by multiplying together further signals corresponding to radiative noise in the flowing system and derived from each of a second pair of positions spaced apart in the direction of flow.
Claim 14
Independent Claim
80 words
A method of detecting the velocity of a flow which comprises deriving from each of a first pair of positions spaced apart in the direction of flow a signal corresponding to radiative noise in the flowing system, multiplying said signals together and cross-correlating the product with the product signal obtained by multiplying together further signals corresponding to radiative noise in the flowing system and derived from each of a second pair of positions spaced apart in the direction of flow.
Claim 15
Dependent Claim
20 words
A method as claimed in claim 10 in which the flow is that of a system constrained within a duct.
Claim 16
Dependent Claim
24 words
A method as claimed in claim 10 in which the radiative noise comprises acoustic radiation generated by random fluctuations in a flowing fluid system.
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) | 1977-10-28 | 1978-04-29 | 1978-10-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-10-28 | 1982-04-29 | 1982-10-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-10-28 | 1986-04-29 | 1986-10-29 | $7700.00 | Window Closed / Lapsed |