US3558898A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Flow measurement system using time correlation of two photocell signals
Assignee: Bio Rad Laboratories Inc
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Filing: 1966-10-03
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Granted: 1971-01-26
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Expires: 1986-10-03
Abstract
Abstract This invention is a flow measuring system using a pair of radiation detectors spaced from one another, and corresponding optical systems for imaging volume elements of a flow stream onto the radiation detectors. In one embodiment, the optical system is disposed to examine two separate volume elements spaced along the line of the flow stream. The radiation detectors provide electrical signals which are then time correlated. In another embodiment, the two optical systems have intersecting fields of view so as to examine a common volume element. One optical system s movable so that one can examine a series of common volume elements along a line substantially normal to the flow stream. The correlation of the signal from the two detectors in the latter embodiment permits measurement of the radiation profile across the flow stream.
Inventors
- 👤 Myron J Block
- 👤 Alexander S Zachor
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 17:25
CPC Classifications
G; G01; G01P; G01P5/00; G01P5/18; G01P5/20
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
88 words
Apparatus for determining flow characteristics of a flowing fluid, and comprising in combination: means for defining a first discrete beam of radiation from a volume element of said fluid; first radiation detection means diaposed for detecting said first beam and for providing an electrical signal responsively thereto; means for defining a second discrete beam of radiation from a volume element of said fluid; second radiation detection means disposed for detecting said second beam and for providing an electrical signal responsively thereto; and means for time correlating said signals.
Claim 2
Dependent Claim
88 words
Apparatus for determining flow characteristics of a flowing fluid, and comprising in combination: means for defining a first discrete beam of radiation from a volume element of said fluid; first radiation detection means diaposed for detecting said first beam and for providing an electrical signal responsively thereto; means for defining a second discrete beam of radiation from a volume element of said fluid; second radiation detection means disposed for detecting said second beam and for providing an electrical signal responsively thereto; and means for time correlating said signals.
Claim 3
Dependent Claim
15 words
Apparatus as defined in claim 1 wherein said detecting means are spaced from one another.
Claim 4
Dependent Claim
61 words
Apparatus as defined in claim 1 wherein said means for defining said beams comprises means for providing an image of each of said detection means at a unique spatial position defined by a corresponding one of said volume elements and wherein said means for time correlating said signals comprises means for determining the time delay between correlative portions of said signals.
Claim 5
Dependent Claim
38 words
Apparatus as defined in claim 3 wherein said volume elements are spaced from one another and said images are comparable to the maximum wave length of the pressure, density and temperature fields within the turbulence of said fluid.
Claim 6
Dependent Claim
27 words
Apparatus as defined in claim 4 wherein the images of said detection means are alignable along a line parallel to the mean flow direction of said fluid.
Claim 7
Dependent Claim
53 words
Apparatus as defined in claim 1 wherein said means for defining said beams are positioned with respect to one another so that said volume elements are coincident and define an intersecting Volume common to both beams, and wherein said means for time correlating comprises means for determining simultaneous correlative portions of said signals.
Claim 8
Dependent Claim
39 words
Apparatus as defined in claim 6 wherein at least one of said means for defining said beams is movable with respect to the other so as to permit the intersecting volume to be scanned along one of said beams.
Claim 9
Dependent Claim
20 words
Apparatus as defined in claim 6 wherein said means for cross-correlating comprises means for multiplying and integrating said electrical signals.
Claim 10
Dependent Claim
49 words
Method for measuring flow characteristics of a flowing fluid and comprising the steps of: continuously measuring from one position radiation from a volume element of said fluid; Continuously measuring from another position radiation from a volume element of said fluid; and determining a cross-correlation time function between the measurements.
Claim 11
Dependent Claim
49 words
Method for measuring flow characteristics of a flowing fluid and comprising the steps of: continuously measuring from one position radiation from a volume element of said fluid; Continuously measuring from another position radiation from a volume element of said fluid; and determining a cross-correlation time function between the measurements.
Claim 12
Dependent Claim
37 words
Method as defined in claim 9 including the step of selecting said volume elements so as to change their alignment or spacing or both relative to mean flow direction or flow boundaries or both of said fluid.
References Cited (Backward Citations)
US2599975A
Cited
US3304535A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-01-25 | 1974-07-27 | 1975-01-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-25 | 1978-07-27 | 1979-01-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-25 | 1982-07-27 | 1983-01-26 | $7700.00 | Window Closed / Lapsed |