US3926527A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rotating gas correlation cell
Assignee: Lanteris Space LLC
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Filing: 1974-06-05
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Granted: 1975-12-16
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Expires: 1994-06-05
Abstract
Abstract A rotating gas cell structure, intended for use in nondispersive electro-optical measurement equipment, includes at least a pair of chambers that, by virtue of rotation of the structure, are alternately inserted into a beam of radiant energy. The chambers contain a quantity of gas of the species to be analyzed at different pressure values. When used in a nondispersive radiant energy gas analyzer, the rotating cell will modulate the radiant energy in a way that permits a sensitive and accurate evaluation of a particular gas in a sample region. If desired the cell structure can include a built-in chopper to improve gas detection performance. In an alternate embodiment one of the chambers can be replaced by a radiant energy attenuator. Gas filling and sealing means for the cell chambers are disclosed.
Inventors
- 👤 John D Pembrook
- 👤 Darrell E Burch
- 👤 Francis J Gates
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:35
CPC Classifications
G; G01; G01N; G01N21/00; G01N21/17; G01N21/25; G01N21/31; G01N21/35; G01N21/3504; G01N21/3518
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
170 words
A rotating gas correlation cell for use in a nondispersive gas analyzer, said cell comprising: a cylindrical housing having an outer rim and an axial collar, said collar including means for attaching said housing to a shaft operative to rotate said cylinder about its axis of symmetry, a pluralilty of apertures extending through said housing parallel to and on opposite sides of the axis of said cylinder, window means sealed to the end faces of said housing to close said apertures off into sealed compartments, said compartments being adapted to contain a quantity of gas through which radiant energy can be passed by way of said windows, at least one of said windows having associated therewith a series of radial sectors of high optical attenuation material, said sectors acting periodically to interrupt said radiant energy as said cell is rotated, fill means extending into said compartments and through said outer rim whereby said gas can be injected into said compartments and means for selectively opening and closing said fill means.
Claim 2
Dependent Claim
170 words
A rotating gas correlation cell for use in a nondispersive gas analyzer, said cell comprising: a cylindrical housing having an outer rim and an axial collar, said collar including means for attaching said housing to a shaft operative to rotate said cylinder about its axis of symmetry, a pluralilty of apertures extending through said housing parallel to and on opposite sides of the axis of said cylinder, window means sealed to the end faces of said housing to close said apertures off into sealed compartments, said compartments being adapted to contain a quantity of gas through which radiant energy can be passed by way of said windows, at least one of said windows having associated therewith a series of radial sectors of high optical attenuation material, said sectors acting periodically to interrupt said radiant energy as said cell is rotated, fill means extending into said compartments and through said outer rim whereby said gas can be injected into said compartments and means for selectively opening and closing said fill means.
Claim 3
Dependent Claim
14 words
The cell of claim 1 wherein said sectors comprise material adhered to said window.
Claim 4
Dependent Claim
14 words
The cell of claim 1 wherein said sectors comprise metal deposited onto said window.
Claim 5
Dependent Claim
47 words
The cell of claim 1 wherein one of said compartments is filled with a material that does not appreciably attenuate said radiant energy and the window area associated with said one of said compartments is at least partially covered with radiant energy attenuating material having neutral density.
Claim 6
Dependent Claim
67 words
The cell of claim 1 wherein one of said compartments is filled with a material that does not appreciably attenuate said radiant energy and said sectors are made wider over the window area associated with said one of said compartments than said sectors over the remainder of said window, said sectors being made of sufficiently different width to achieve a desired reduction in average radiant energy transmission.
Claim 7
Dependent Claim
58 words
The cell of claim 1 wherein four compartments are present and two beams of radiant energy are employed, two of said compartments being located at a first radial distance from the rotational axis of said cell, the other two of said compartments being located at a second and greater radial distance from the rotational axis of said cell.
Claim 8
Dependent Claim
89 words
The cell of claim 1 wherein said fill means for each compartment comprises a screw having a threaded shank portion threadedly engaged in a threaded hole in said outer rim and a head portion larger in diameter than said shank portion, said shank portion being formed with a longitudinally extending slot providing a passage from the exterior of said rim to said compartment, and an O-ring surrounding said shank and lying between said head portion and said rim, said O-ring sealing said fill means as said screw is tightened.
References Cited (Backward Citations)
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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) | 1978-12-15 | 1979-06-16 | 1979-12-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-12-15 | 1983-06-16 | 1983-12-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-12-15 | 1987-06-16 | 1987-12-16 | $7700.00 | Window Closed / Lapsed |