US5546183A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Lidar droplet size monitor for in-flight measurement of aircraft engine exhaust contrails, droplets and aerosols
Assignee: Northrop Grumman Corp
•
Filing: 1994-10-12
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Granted: 1996-08-13
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Expires: 2014-10-12
Abstract
Abstract A lidar system which utilizes optical backscatter and extinction to determine the size of particles inside the exhaust plume of an aircraft at a distance of several hundred meters behind the aircraft. The system transmits a laser beam through the exhaust plume of the aircraft, where it is reflected by the particles contained in the exhaust plume. The reflected light is detected by a receiver, where it is processed by a computer to calculate the size of the particles in the exhaust plume.
Inventors
- 👤 Ronald W. Fegley
- 👤 Darrell A. Terry
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 03:58
CPC Classifications
G; G01; G01S; G01S17/00; G01S17/88; G01N; G01N15/00; G01N15/02; G01N15/0205
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
79 words
A lidar system that is aboard a flying vehicle to monitor a particle size of particles contained in an exhaust plume produced by the vehicle, said system comprising: means for propagating a beam that travels through the exhaust plume; means for detecting the propagated beam after the propagated beam is reflected by the particles contained in the exhaust plume; and means coupled to said detecting means for calculating the particle size of the particles contained in the exhaust plume.
Claim 2
Dependent Claim
79 words
A lidar system that is aboard a flying vehicle to monitor a particle size of particles contained in an exhaust plume produced by the vehicle, said system comprising: means for propagating a beam that travels through the exhaust plume; means for detecting the propagated beam after the propagated beam is reflected by the particles contained in the exhaust plume; and means coupled to said detecting means for calculating the particle size of the particles contained in the exhaust plume.
Claim 3
Dependent Claim
27 words
The system claimed in claim 1, further including means coupled to said calculating means for displaying the particle size of the particles contained in the exhaust plume.
Claim 4
Dependent Claim
13 words
The system claimed in claim 2, wherein said displaying means is a meter.
Claim 5
Dependent Claim
13 words
The system claimed in claim 1, wherein said propagating means is a laser.
Claim 6
Dependent Claim
28 words
The system claimed in claim 4, wherein said propagating means further includes: a lens positioned between the laser and the propagated beam, said lens focusing the propagated beam.
Claim 7
Dependent Claim
13 words
The system claimed in claim 1, wherein said detecting means is a receiver.
Claim 8
Dependent Claim
32 words
The system claimed in claim 6, wherein said detecting means further includes a lens that is positioned between the reflected propagated beam and said receiver, said lens focusing the reflected propagated beam.
Claim 9
Dependent Claim
13 words
The system claimed in claim 1, wherein said calculating means is a computer.
References Cited (Backward Citations)
US4251733A
Cited
US4497577A
Cited
US4492467A
Cited
US4459024A
Cited
US4871251A
Cited
US5116124A
Cited
US5206698A
Cited
US5047653A
Cited
US5094532A
Cited
US5285256A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1999-08-13 | 2000-02-12 | 2000-08-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-08-13 | 2004-02-12 | 2004-08-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-08-13 | 2008-02-12 | 2008-08-13 | $7700.00 | Window Closed / Lapsed |