US4719360A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for determination of concentration of smoke emanating from combustion engine and apparatus for working said method
Assignee: National Institute of Advanced Industrial Science and Technology
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Filing: 1986-03-11
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Granted: 1988-01-12
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Expires: 2006-03-11
Abstract
Abstract Concentration of a smoke emanating from a combustion engine is determined by projecting beams of light on the flow of smoke in directions traversing the flow of smoke, detecting intensities of beams of light which have traversed the flow of smoke with a light receiving device and calculating a cross-sectional image of the flow of smoke based on detection signals issued by the light receiving device.
Inventors
- 👤 Kazuo Kontani
- 👤 Shinichi Goto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 21:07
CPC Classifications
G; G01; G01N; G01N21/00; G01N21/17; G01N21/47; G01N21/49; G01N21/53; G01N21/534; G01N2021/178; G01N21/59; G01N21/5907; G01N2021/5969; G01N2201/00; G01N2201/06; G01N2201/061; G01N2201/06113; G01N2201/08; G01N2201/0833; G01N2201/084
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
129 words
A method for the determination of concentration of smoke emanating from a combustion engine, which comprises projecting, into a flow of smoke in a plurality of directions traversing said flow of smoke, beams of light having a single wavelength capable of causing Rayleigh scattering relative to said fine carbon particles contained in said flow of smoke, detecting intensities of beams of light from the plurality of directions with a light receiving device, which beams of light have traversed said flow of smoke and attenuated due to the Rayleigh scattering, and determining absolute values of volume concentration and weight concentration of the fine carbon particles in said flow of smoke by calculating a cross-sectional image of said flow of smoke based on detection signals issued by said light receiving device.
Claim 2
Independent Claim
129 words
A method for the determination of concentration of smoke emanating from a combustion engine, which comprises projecting, into a flow of smoke in a plurality of directions traversing said flow of smoke, beams of light having a single wavelength capable of causing Rayleigh scattering relative to said fine carbon particles contained in said flow of smoke, detecting intensities of beams of light from the plurality of directions with a light receiving device, which beams of light have traversed said flow of smoke and attenuated due to the Rayleigh scattering, and determining absolute values of volume concentration and weight concentration of the fine carbon particles in said flow of smoke by calculating a cross-sectional image of said flow of smoke based on detection signals issued by said light receiving device.
Claim 3
Dependent Claim
24 words
A method according to claim 1 wherein beams of light are projected in directions traversing the whole cross-sectional area of the flow of smoke.
Claim 4
Independent Claim
104 words
An apparatus for the determination of concentration of a smoke emanating from a combustion engine, which comprises a light source for projecting beams of light having a single wavelength capable of causing Rayleigh scattering relative to fine carbon particles so as to traverse a flow of smoke from said combustion engine, a light receiving device for subsequently detecting intensities of the beams of light which have traversed said flow of smoke, and an arithmetic device for calculating absolute values of volume and weight concentrations of said fine carbon particles in said flow of smoke based on detection signals issued by said light receiving device.
Claim 5
Independent Claim
104 words
An apparatus for the determination of concentration of a smoke emanating from a combustion engine, which comprises a light source for projecting beams of light having a single wavelength capable of causing Rayleigh scattering relative to fine carbon particles so as to traverse a flow of smoke from said combustion engine, a light receiving device for subsequently detecting intensities of the beams of light which have traversed said flow of smoke, and an arithmetic device for calculating absolute values of volume and weight concentrations of said fine carbon particles in said flow of smoke based on detection signals issued by said light receiving device.
Claim 6
Dependent Claim
35 words
An apparatus according to claim 3, wherein beams of light which have traversed are received by a plurality of optical fibers and led to light receiving devices connected to leading ends of said optical fibers.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-01-11 | 1991-07-13 | 1992-01-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-01-11 | 1995-07-13 | 1996-01-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-01-11 | 1999-07-13 | 2000-01-12 | $7700.00 | Window Closed / Lapsed |