US4304124A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Charging mechanisms for electrogasdynamic spectral anemometer
Assignee: United States Department of the Navy
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Filing: 1979-11-13
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Granted: 1981-12-08
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Expires: 1999-11-13
Abstract
Abstract A practical charging mechanism for an electrogasdynamic spectral anemometersing ultraviolet radiation. Ultraviolet radiation issues through windows in the wall of a test section through which flows a turbulent gas. The UV ionizes aerosol particles in the gas flow. A metallic rod which is connected to a high voltage source picks up ions of one polarity and a collector downstream neutralizes the ions of the opposite polarity. The current generated at the collector is measured and analyzed.
Inventors
- 👤 Oscar Biblarz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 11:17
CPC Classifications
G; G01; G01P; G01P13/00; G01P13/008; G01N; G01N27/00; G01N27/62; G01N27/64; G01N27/66
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
71 words
An apparatus for measuring the dynamic characteristics of a gas flow comprising: (a) means for charging particles in said gas flow, said means for charging including a source of ultraviolet radiation directed into said gas flow; (b) means situated downstream from said charging means for neutralizing said charged particles from said gas flow; and (c) means for measuring the charge and frequency of said charged particles neutralized by said neutralizing means.
Claim 2
Independent Claim
71 words
An apparatus for measuring the dynamic characteristics of a gas flow comprising: (a) means for charging particles in said gas flow, said means for charging including a source of ultraviolet radiation directed into said gas flow; (b) means situated downstream from said charging means for neutralizing said charged particles from said gas flow; and (c) means for measuring the charge and frequency of said charged particles neutralized by said neutralizing means.
Claim 3
Dependent Claim
58 words
An apparatus as recited in claim 1 wherein said charging means comprises: (a) a source of ultraviolet radiation focused on said gas flow, said ultraviolet radiation having sufficient energy to ionize aerosols contained in said gas flow to generate said charged particles; and (b) means for separating the ions of opposite polarity which make up said charged particles.
Claim 4
Dependent Claim
52 words
An apparatus as recited in claim 2 wherein said separating means comprises: (a) a slender, metallic rod situated in said gas flow; and (b) a high voltage source connected to said rod to induce a charge which neutralizes charged particles of opposite polarity to the charged particles neutralized by said neutralizing means.
Claim 5
Dependent Claim
18 words
An apparatus as recited in claim 3 wherein said high voltage source comprises a high voltage ac source.
Claim 6
Dependent Claim
50 words
An apparatus as recited in claim 4 further comprising an ac discriminator connected between said neutralizing means and said measuring means to compensate for the ac signal introduced by said high voltage ac source and to select the polarity of said charged particles to be processed by said measuring means.
Claim 7
Dependent Claim
59 words
An apparatus as recited in claim 1 wherein said charging means comprises: (a) a highly charged slender metallic rod having a tip of a photoelectric emitter material; and (b) a source of ultraviolet energy focused on said tip to cause electrons to be emitted, said electrons attaching to aerosol particles of said gas flow to form said charged particles.
Claim 8
Dependent Claim
106 words
Apparatus for measuring the dynamic characteristics of a gas flow comprising: (a) a source of ultraviolet radiation focused on said gas flow, said ultraviolet radiation having sufficient energy to ionize aerosols contained in said gas flow to generate charged particles; (b) first means for neutralizing charged particles of a selected polarity, said first neutralizing means being disposed downstream from said source of ultraviolet radiation; (c) second means for neutralizing charged particles of a selected polarity, said second neutralizing means being disposed downstream from said first neutralizing means; and (d) means for measuring the charge and frequency of the charged particles neutralized by said second neutralizing means.
Claim 9
Dependent Claim
106 words
Apparatus for measuring the dynamic characteristics of a gas flow comprising: (a) a source of ultraviolet radiation focused on said gas flow, said ultraviolet radiation having sufficient energy to ionize aerosols contained in said gas flow to generate charged particles; (b) first means for neutralizing charged particles of a selected polarity, said first neutralizing means being disposed downstream from said source of ultraviolet radiation; (c) second means for neutralizing charged particles of a selected polarity, said second neutralizing means being disposed downstream from said first neutralizing means; and (d) means for measuring the charge and frequency of the charged particles neutralized by said second neutralizing means.
Claim 10
Dependent Claim
53 words
Apparatus as recited in claim 7 wherein said first neutralizing means comprises: (a) a slender, metallic rod situated in said gas flow; and (b) a high voltage source connected to said rod to induce a charge which neutralizes charged particles of opposite polarity to the charged particles neutralized by said second neutralizing means.
Claim 11
Dependent Claim
17 words
Apparatus as recited in claim 8 wherein said high voltage source comprises a high voltage ac source.
Claim 12
Dependent Claim
50 words
Apparatus as recited in claim 9 further comprising an AC discriminator connected between said second neutralizing means and said measuring means to compensate for the ac signal introduced by said high voltage ac source and to select the polarity of said charged particles to be processed by said measuring means.
Claim 13
Dependent Claim
91 words
Apparatus for measuring the dynamic characteristics of a gas flow comprising: (a) a highly charged slender metallic rod having a tip of a photoelectric emitter material; (b) a source of ultraviolet energy focused on said tip to cause electrons to be emitted, said electrons attaching to aerosol particles to said gas flow to form charged particles; (c) means for neutralizing said charged particles, said neutralizing means being disposed downstream from said metallic rod; and (d) means for measuring the charge and frequency of the charged particles neutralized by said neutralizing means.
Claim 14
Dependent Claim
91 words
Apparatus for measuring the dynamic characteristics of a gas flow comprising: (a) a highly charged slender metallic rod having a tip of a photoelectric emitter material; (b) a source of ultraviolet energy focused on said tip to cause electrons to be emitted, said electrons attaching to aerosol particles to said gas flow to form charged particles; (c) means for neutralizing said charged particles, said neutralizing means being disposed downstream from said metallic rod; and (d) means for measuring the charge and frequency of the charged particles neutralized by said neutralizing means.
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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) | 1984-12-07 | 1985-06-08 | 1985-12-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-12-07 | 1989-06-08 | 1989-12-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-12-07 | 1993-06-08 | 1993-12-08 | $7700.00 | Window Closed / Lapsed |