Patent US3766379A successfully refreshed from Google Patents.
US3766379A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Measuring density by beta-particle absorption
Assignee: British Coal Utilization Research Association Ltd
•
Filing: 1971-03-04
•
Granted: 1973-10-16
•
Expires: 1991-03-04
Abstract
Abstract In measuring density of a gaseous suspension of solid particles two or more sources of Beta -particles, a collimator and a single Beta -particle detector are used to obtain a single reading which is a measure of the average density of the gaseous suspension.
Inventors
- 👤 M Parkinson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 08:53
CPC Classifications
G; G01; G01N; G01N23/00; G01N23/02; G01N23/06; G01N23/12
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
238 words
Density measuring apparatus for measuring the density of a gaseous suspension of solid particles flowing along a conduit, said apparatus comprising: a. a Beta -particle detector, b. a collimator having a plurality of straight tubes arranged with their axes parallel to the axis of the collimator, c. said collimator being positioned adjacent to and in axial alignment with said detector between said detector and the gaseous suspension so that Beta -particles that have passed through the collimator after leaving the gaseous suspension will be detected by said detector, and d. two or more sources of Beta -particles positioned to each direct Beta -particles through said gaseous suspension toward said detector, said sOurces of Beta -particles being equal distances from said collimator, e. the lengths and widths of the tubes of said collimator being proportioned to admit to said detector Beta -particles directed theretoward from each of said sources, and f. said sources being of such strengths that the count rates of Beta -particles detected by said detector from each of said sources are equal to one another when the gaseous suspension is not flowing through the conduit, whereby the ratio of (N) the total count rate of Beta -particles detected when the suspension is flowing in the conduit, to (No) the total count rate of Beta -particles detected with only the suspending gas present in the conduit, affords a measure of the average density of said gaseous suspension.
Claim 2
Dependent Claim
238 words
Density measuring apparatus for measuring the density of a gaseous suspension of solid particles flowing along a conduit, said apparatus comprising: a. a Beta -particle detector, b. a collimator having a plurality of straight tubes arranged with their axes parallel to the axis of the collimator, c. said collimator being positioned adjacent to and in axial alignment with said detector between said detector and the gaseous suspension so that Beta -particles that have passed through the collimator after leaving the gaseous suspension will be detected by said detector, and d. two or more sources of Beta -particles positioned to each direct Beta -particles through said gaseous suspension toward said detector, said sOurces of Beta -particles being equal distances from said collimator, e. the lengths and widths of the tubes of said collimator being proportioned to admit to said detector Beta -particles directed theretoward from each of said sources, and f. said sources being of such strengths that the count rates of Beta -particles detected by said detector from each of said sources are equal to one another when the gaseous suspension is not flowing through the conduit, whereby the ratio of (N) the total count rate of Beta -particles detected when the suspension is flowing in the conduit, to (No) the total count rate of Beta -particles detected with only the suspending gas present in the conduit, affords a measure of the average density of said gaseous suspension.
Claim 3
Dependent Claim
39 words
adjusting the strengths of said sources so that the count rates of Beta -particles detected by said detector from each of said sources are equal to one another when the gaseous suspension is not flowing through the conduit, and
Claim 4
Dependent Claim
39 words
adjusting the strengths of said sources so that the count rates of Beta -particles detected by said detector from each of said sources are equal to one another when the gaseous suspension is not flowing through the conduit, and
Claim 5
Dependent Claim
67 words
Density-measuring apparatus according to claim 1, wherein there are three sources of Beta -particles, one of the sources being positioned on the axis of the collimator, and the other two sources being positioned on either side of that source so that the angles between the lines joining the said other two sources to the collimator and the line joining the first-mentioned source to the collimator are equal.
Claim 6
Dependent Claim
24 words
Density-measuring apparatus according to claim 2, wherein the conduit is circular and the axis of the collimator lies on a diameter of the conduit.
Claim 7
Dependent Claim
57 words
measuring the total count rate of Beta -particles reaching said detector from said plurality of sources when said gaseous suspension is flowing in the conduit, and when only the suspending gas is present, thereby obtaining two data values the ratio of which is a measure of the average density of the gaseous suspension flowing in the conduit.
Claim 8
Dependent Claim
57 words
measuring the total count rate of Beta -particles reaching said detector from said plurality of sources when said gaseous suspension is flowing in the conduit, and when only the suspending gas is present, thereby obtaining two data values the ratio of which is a measure of the average density of the gaseous suspension flowing in the conduit.
Claim 9
Dependent Claim
20 words
Density-measuring apparatus according to claim 1, wherein the sources and the axis of the detector are in the same plane.
Claim 10
Dependent Claim
96 words
Density-measuring apparatus according to claim 4, wherein the conduit is circular and there are three sources of Beta -particles, one of the sources being positioned diametrically opposite the collimator and within the conduit and the other two sources being positioned on either side of that source in the wall of the conduit so that the angles between the lines joining the said other two sources to the collimator and the line joining the first-mentioned source to the collimator are equal, the collimator being so orientated that the first-mentioned source lies on the axis of the collimator.
Claim 11
Dependent Claim
21 words
Density-measuring apparatus according to claim 1, wherein the sources are arranged in the wall of the conduit and are offset axially.
Claim 12
Dependent Claim
29 words
Density-measuring apparatus according to claim 1, wherein the collimator tubes are constructed from materials which contain substantially no quantity of any element having an atomic number greater than 16.
Claim 13
Dependent Claim
17 words
Density-measuring apparatus according to claim 7, wherein the collimator tubes are constructed from polythene or polyvinyl chloride.
Claim 14
Independent Claim
77 words
A method of measuring density by Beta -particle absorbtion of a gaseous suspension of solid particles flowing along a conduit with the aid of a Beta -particle detector, a collimator having a plurality of straight tubes arranged with their axes parallel to the axis of the collimator and positioned in axial alignment with said detector between said detector and the gaseous suspension, and a plurality of Beta -particle sources spaced equidistant from said detector, which method comprises:
Claim 15
Independent Claim
77 words
A method of measuring density by Beta -particle absorbtion of a gaseous suspension of solid particles flowing along a conduit with the aid of a Beta -particle detector, a collimator having a plurality of straight tubes arranged with their axes parallel to the axis of the collimator and positioned in axial alignment with said detector between said detector and the gaseous suspension, and a plurality of Beta -particle sources spaced equidistant from said detector, which method comprises:
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) | 1976-10-15 | 1977-04-16 | 1977-10-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-15 | 1981-04-16 | 1981-10-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-15 | 1985-04-16 | 1985-10-16 | $7700.00 | Window Closed / Lapsed |