US4579456A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process and device for the quantity determination of small amounts of gaseous components in a gas mixture
Assignee: Office National d'Études et de Recherches Aérospatiales
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Filing: 1983-08-03
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Granted: 1986-04-01
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Expires: 2003-08-03
Abstract
Abstract A radiation beam, having passed through the mixture containing the component whose spectral composition contains at least one characteristic spectral line of the component, is caused to pass alternately along two channels one of which comprises a definite amount of the gaseous component and the other of which serves as reference. The second channel over which the radiation beam travels is limited to a diaphragm having a radiation transmission substantially equal to that of the first channel in the absence of said component in the mixture. The output beam from the two channels is directed towards a detector for detecting the variation of intensity of the beam through a filter for selecting said characteristic radiation.
Inventors
- 👤 Louis Gramont
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 04:15
CPC Classifications
G; G01; G01J; G01J1/00; G01J1/10; G01J1/20; G01J1/34; G01J1/36; G01N; G01N21/00; G01N21/17; G01N21/25; G01N21/31; G01N21/314
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
163 words
A device for determining the quantity of a component present in a small amount in a gas mixture, including: means for alternately directing a radiation beam containing a characteristic absorption radiation of the component and having passed through the mixture alternately along a first channel which comprises a tank containing a predetermined amount of said component and along a second channel which comprises a diaphragm defining an annular opening concentric with said tank and so calibrated as to have a transmission for said characteristic radiation substantially equal to that of said first channel when the mixture does not contain said component; means for directing the radiation beam from both channels through filter means transmitting at least a predetermined fraction of the spectral absorption band of the component to be detected; a detector arranged to receive the radiation beam exiting from said filter means; and means associated with said detector for measuring the amplitude of the variations of the output signal of the detector.
Claim 2
Independent Claim
163 words
A device for determining the quantity of a component present in a small amount in a gas mixture, including: means for alternately directing a radiation beam containing a characteristic absorption radiation of the component and having passed through the mixture alternately along a first channel which comprises a tank containing a predetermined amount of said component and along a second channel which comprises a diaphragm defining an annular opening concentric with said tank and so calibrated as to have a transmission for said characteristic radiation substantially equal to that of said first channel when the mixture does not contain said component; means for directing the radiation beam from both channels through filter means transmitting at least a predetermined fraction of the spectral absorption band of the component to be detected; a detector arranged to receive the radiation beam exiting from said filter means; and means associated with said detector for measuring the amplitude of the variations of the output signal of the detector.
Claim 3
Dependent Claim
35 words
A device according to claim 1, wherein the amount of said component through which the beam passes in the first channel is such that said first channel has a transmission coefficient between 50 and 70%.
Claim 4
Dependent Claim
52 words
The device according to claim 1, characterized in that the means for directing the beam comprise a curtain of blades rotating in synchronism about parallel axes, said curtain having a central part formed by central sections of a part of the blades, which sections are perpendicular to the rest of the blades.
Claim 5
Dependent Claim
66 words
The device according to claim 1, characterized in that the means for alternately directing the beam comprise a central disk for interrupting the channel comprising the tank (12a), rotating about an axis transversal to the beam, and two external plates for interrupting the channel comprising the diaphragm, rotating in synchronism with the disk about axes parallel to that of the disk with an offset of 90°.
Claim 6
Dependent Claim
37 words
The device according to claim 1 characterized in that it comprises, on a common part of the beam, a tank containing a definite amount of the absorbing parasite gases likely to be met with in the mixture.
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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) | 1989-03-31 | 1989-09-30 | 1990-04-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-03-31 | 1993-09-30 | 1994-04-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-03-31 | 1997-09-30 | 1998-04-01 | $7700.00 | Window Closed / Lapsed |