Patent US4829838A successfully refreshed from Google Patents.
US4829838A
Expired / Lapsed
US
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Method and apparatus for the measurement of the size of particles entrained in a gas
Assignee: BTG International Ltd
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Filing: 1987-07-20
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Granted: 1989-05-16
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Expires: 2007-07-20
Abstract
Abstract Apparatus for measuring the size of particles entrained in a gas comprises an optical fibre probe having a hemispherical end and insertable into a stream of gas bearing entrained particles to create a stagnation point in the flowing gas, a Doppler anemometer to measure particle velocity at a point upstream of the stagnation point and a computer-controlled burst counter to determine from the particle velocity measurements the distribution by number of aerodynamic diameter of the particles.
Inventors
- 👤 Roland Clift
- 👤 Jonathan P. K. Seville
- 👤 Andrew H. J. Take
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 15:39
CPC Classifications
G; G01; G01N; G01N15/00; G01N15/10; G01N15/14; G01N15/1456; G01N15/1459; G01N2015/0042; G01N2015/0046; G01N15/02; G01N15/0205; G01N2015/0238; G01N2015/1027; G01N2015/1493
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
65 words
Apparatus for measuring the size of particles entrained in a gas comprising probe means insertable into a stream of gas bearing entrained particles to create a stagnation point in said flowing gas, measuring means to measure particle velocity at a point upstream of said stagnation point and computer means to determine from said particle velocity measurements the distribution of the aerodynamic diameter of said particles.
Claim 2
Dependent Claim
65 words
Apparatus for measuring the size of particles entrained in a gas comprising probe means insertable into a stream of gas bearing entrained particles to create a stagnation point in said flowing gas, measuring means to measure particle velocity at a point upstream of said stagnation point and computer means to determine from said particle velocity measurements the distribution of the aerodynamic diameter of said particles.
Claim 3
Dependent Claim
24 words
Apparatus for measuring the size of particles entrained in a gas as claimed in claim 1 wherein said probe means comprises an optical fiber.
Claim 4
Dependent Claim
31 words
Apparatus for measuring the size of particles entrained in a gas as claimed in claim 2 wherein said optical fiber is equipped with a lens focused upstream of the probe means.
Claim 5
Dependent Claim
26 words
Apparatus for measuring the size of particles entrained in a gas as claimed in claim 3 wherein a Doppler anemometer is coupled to said optical fiber.
Claim 6
Dependent Claim
26 words
Apparatus for measuring the size of particles entrained in a gas as claimed in claim 2 wherein a Doppler anemometer is coupled to said optical fiber.
Claim 7
Dependent Claim
26 words
Apparatus for measuring the size of particles entrained in a gas as claimed in claim 2 wherein said optical fiber is a graded index optical fiber.
Claim 8
Dependent Claim
33 words
Apparatus for measuring the size of particles entrained in a gas as claimed in claim 1 wherein a diameter of said probe means is varied in order to measure different sizes of particles.
Claim 9
Independent Claim
55 words
A method of measuring the size of particles entrained in a gas comprising inserting probe means into a gas stream bearing entrained particles to create a stagnation point, measuring the particle velocity at a point upstream of said stagnation point and computing from said particle measurements the distribution of the aerodynamic diameter of said particles.
Claim 10
Independent Claim
55 words
A method of measuring the size of particles entrained in a gas comprising inserting probe means into a gas stream bearing entrained particles to create a stagnation point, measuring the particle velocity at a point upstream of said stagnation point and computing from said particle measurements the distribution of the aerodynamic diameter of said particles.
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) | 1992-05-15 | 1992-11-14 | 1993-05-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-05-15 | 1996-11-14 | 1997-05-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-05-15 | 2000-11-14 | 2001-05-16 | $7700.00 | Window Closed / Lapsed |