US3795450A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dual beam optical absorption photometry detector assembly for high pressure applications
Assignee: Varian Medical Systems Inc
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Filing: 1973-01-18
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Granted: 1974-03-05
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Expires: 1993-01-18
Abstract
Abstract A detector assembly providing a sample cell and a reference cell for use in a dual beam optical absorption photometry instrument wherein the reference cell and sample cell are formed by a pair of bores extending through a main detector body in an axial direction from one end of the body to the other end, each end of the body being provided with apparatus to seal the reference and sample bores from each other comprising a transparent lens with a flat surface positioned at the end of the body and over the cell openings, the outer face of the lens being convex, a thin sheet gasket material overlying the outer face of the lens, a metal pressure plate overlying the gasket material, both the gasket and pressure plate being provided with openings therein aligned with the sample and reference bores in the cell body, and means for exerting a pressure on the surface of the pressure plate whereby the pressure plate exerts a force on the gasket and lens to force the lens against the end wall of the cell body, the pressure plate deforming under pressure to assume the convex shape of the outer face of the lens whereby the pressure applied by the pressure plate is spread over the surface area of the lens with a maximum pressure applied at the central region thereof which is aligned with the wall section of the main body between the two cell bores. In one embodiment, an additional gasket material is positioned between the flat surface of the lens and the end of the cell body with suitable openings therein aligned with the sample and reference cell bores, this additional gasket material either being heat treated to fuse to the cell body and lens face and provide additional sealing or left in its natural state to provide resilience at the surface of the seal.
Inventors
- 👤 M Munk
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 11:42
CPC Classifications
G; G01; G01N; G01N21/00; G01N21/01; G01N21/03; G01N21/05; G01N30/00; G01N30/02; G01N30/62; G01N30/74; G01N2030/746
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
322 words
A detector assembly for a double beam optical absorption photometer comprising a cell chamber having a pair of passageways extending therethrough from one end thereof to the other end, said passageways being spaced apart and parallel with a wall portion formed between said two passageways by said cell chamber, said cell chamber having an inlet passage and an outlet passage for one of said passageways for passing a sample substance therethrough and an inlet passage and an outlet passage for the other of said passageways for passing a reference substance therethrough, whereby optical radiation may be passed in one beam through the sample substance passageway from said one end thereof to said other end thereof and passed in a second beam through the reference substance passageway from said one end thereof to said other end thereof, and sealing means at each end of said cell chamber, each sealing means comprising a lens positioned with a flat inner face against the end of the cell chamber and over the two ends of the two passageways and the wall section therebetween, the outer face of the lens being convex, and means for pressing said lens against the end of said cell chamber to form a pressure seal between the lens inner face and the end of the cell chamber to seal the passageways from each other comprising a disc shaped sheet of flexible gasket material with an inner face overlying the convex face of said lens, a metal pressure disc with an inner face overlying said flexible gasket, said gasket and said pressure disc each having a pair of openings therein aligned with the pair of passageways in said cell chamber to allow passage of the optical beams therethrough, and means for applying pressure to said pressure disc whereby said pressure disc and gasket conform to and press against the convex face of said lens to sealably urge said lens against said cell chamber.
Claim 2
Dependent Claim
322 words
A detector assembly for a double beam optical absorption photometer comprising a cell chamber having a pair of passageways extending therethrough from one end thereof to the other end, said passageways being spaced apart and parallel with a wall portion formed between said two passageways by said cell chamber, said cell chamber having an inlet passage and an outlet passage for one of said passageways for passing a sample substance therethrough and an inlet passage and an outlet passage for the other of said passageways for passing a reference substance therethrough, whereby optical radiation may be passed in one beam through the sample substance passageway from said one end thereof to said other end thereof and passed in a second beam through the reference substance passageway from said one end thereof to said other end thereof, and sealing means at each end of said cell chamber, each sealing means comprising a lens positioned with a flat inner face against the end of the cell chamber and over the two ends of the two passageways and the wall section therebetween, the outer face of the lens being convex, and means for pressing said lens against the end of said cell chamber to form a pressure seal between the lens inner face and the end of the cell chamber to seal the passageways from each other comprising a disc shaped sheet of flexible gasket material with an inner face overlying the convex face of said lens, a metal pressure disc with an inner face overlying said flexible gasket, said gasket and said pressure disc each having a pair of openings therein aligned with the pair of passageways in said cell chamber to allow passage of the optical beams therethrough, and means for applying pressure to said pressure disc whereby said pressure disc and gasket conform to and press against the convex face of said lens to sealably urge said lens against said cell chamber.
Claim 3
Dependent Claim
45 words
A detector assembly as claimed in claim 1 wherein said pressure applying means comprises an annular member engaging the outer face of said pressure disc near the peripheral region thereof, and means for urging said annular member against the peripheral region of said pressure disc.
Claim 4
Dependent Claim
249 words
A detector assembly for a double beam optical absorption photometer comprising a cell chamber having a pair of passageways extending therethrough from one end thereof to the other end, said passageways being spaced apart and parallel with a wall portion formed between said two passageways by said cell chamber, said cell chamber having an inlet passage and an outlet passage for one of said passageways for passing a sample substance therethrough and an inlet passage and an outlet passage for the other of said passageways for passing a reference substance therethrough, whereby optical radiation may be passed in one beam through the sample substance in one passageway from said one end thereof to said other end thereof and passed in a second beam through the reference substance in the other passageway from said one end thereof to said other end thereof, and sealing means at each end of said cell chamber, each sealing means comprising a lens positoned with an inner surface facing the end of the celL chamber and over the two ends of the two passageways and the wall section therebetween, a rubber-like gasket material sandwiched between the end of said cell chamber and said inner lens surface, said gasket having a pair of openings therein aligned with the pair of passageways in said cell chamber to allow passage of the optical beams therethrough, and means for applying pressure to the outer face of said lens to urge it against the gasket and cell chamber end wall.
Claim 5
Dependent Claim
249 words
A detector assembly for a double beam optical absorption photometer comprising a cell chamber having a pair of passageways extending therethrough from one end thereof to the other end, said passageways being spaced apart and parallel with a wall portion formed between said two passageways by said cell chamber, said cell chamber having an inlet passage and an outlet passage for one of said passageways for passing a sample substance therethrough and an inlet passage and an outlet passage for the other of said passageways for passing a reference substance therethrough, whereby optical radiation may be passed in one beam through the sample substance in one passageway from said one end thereof to said other end thereof and passed in a second beam through the reference substance in the other passageway from said one end thereof to said other end thereof, and sealing means at each end of said cell chamber, each sealing means comprising a lens positoned with an inner surface facing the end of the celL chamber and over the two ends of the two passageways and the wall section therebetween, a rubber-like gasket material sandwiched between the end of said cell chamber and said inner lens surface, said gasket having a pair of openings therein aligned with the pair of passageways in said cell chamber to allow passage of the optical beams therethrough, and means for applying pressure to the outer face of said lens to urge it against the gasket and cell chamber end wall.
Claim 6
Dependent Claim
126 words
A detector assembly as claimed in claim 3 wherein the outer face of said lens is convex and wherein said pressure applying means comprises a disc shaped sheet of flexible gasket material with an inner face overlying the convex face of said lens, a metal pressure disc with an inner face overlying said sheet gasket, said sheet gasket and said pressure disc each having a pair of openings therein aligned with the pair of passageways in said cell chamber to allow passage of the optical beams therethrough, and means for applying pressure to said pressure disc whereby said pressure disc and sheet gasket conform to and press against the convex face of said lens to urge said lens against said fused gasket and said cell chamber.
Claim 7
Dependent Claim
45 words
A detector assembly as claimed in claim 4 wherein said pressure applying means comprises an annular member engaging the outer face of said pressure disc near the peripheral region thereof, and means for urging said annular member against the peripheral region of said pressure disc.
Claim 8
Dependent Claim
21 words
A detector assembly as claimed in claim 3 wherein said gasket material is fused to said cell chamber and said lens.
Claim 9
Independent Claim
337 words
The method of sealing the flowing sample cell region from the flowing reference cell region in the detector assembly of a double beam optical absorption photometer wherein the cell chamber has a pair of cell passageways extending therethrough from one end thereof to the other end, said passageways being spaced apart and parallel with a wall portion formed by said cell chamber between said two passageways, said cell chamber having an inlet passage and an outlet passage for one of said cell passageways for passing a sample substance therethrough and an inlet passage and an outlet passage for the other of said cell passageways for passing a reference substance therethrough, whereby optical radiation may be passed in one beam through the sample substance cell passageway from said one end thereof to said other end thereof and passed in a second beam through the reference substance cell passageway from said one end thereof to said other end thereof, and wherein each cell end is sealed by a transparent lens positioned with a flat inner face against the end of the cell chamber and over the ends of the two cell passageways and the wall section therebetween to form a pressure seal between the lens inner face and the end of the cell chamber to isolate the cell passageways from each other, the outer face of the lens being convex, comprising the steps of positioning a disc shaped sheet of flexible gasket material with an inner face overlying the convex face of said lens, positioning a metal pressure disc with an inner face overlying said flexible gasket, said gasket and said pressure disc each having a pair of openings therein aligned with the pair of cell passageways in said cell chamber to allow the optical beams to pass therethrough, and exerting pressure against the outer face of said pressure disc to deform said pressure disc and said gasket to conform to and press against the convex face of said lens to sealably urge said lens against said cell chamber.
Claim 10
Independent Claim
337 words
The method of sealing the flowing sample cell region from the flowing reference cell region in the detector assembly of a double beam optical absorption photometer wherein the cell chamber has a pair of cell passageways extending therethrough from one end thereof to the other end, said passageways being spaced apart and parallel with a wall portion formed by said cell chamber between said two passageways, said cell chamber having an inlet passage and an outlet passage for one of said cell passageways for passing a sample substance therethrough and an inlet passage and an outlet passage for the other of said cell passageways for passing a reference substance therethrough, whereby optical radiation may be passed in one beam through the sample substance cell passageway from said one end thereof to said other end thereof and passed in a second beam through the reference substance cell passageway from said one end thereof to said other end thereof, and wherein each cell end is sealed by a transparent lens positioned with a flat inner face against the end of the cell chamber and over the ends of the two cell passageways and the wall section therebetween to form a pressure seal between the lens inner face and the end of the cell chamber to isolate the cell passageways from each other, the outer face of the lens being convex, comprising the steps of positioning a disc shaped sheet of flexible gasket material with an inner face overlying the convex face of said lens, positioning a metal pressure disc with an inner face overlying said flexible gasket, said gasket and said pressure disc each having a pair of openings therein aligned with the pair of cell passageways in said cell chamber to allow the optical beams to pass therethrough, and exerting pressure against the outer face of said pressure disc to deform said pressure disc and said gasket to conform to and press against the convex face of said lens to sealably urge said lens against said cell chamber.
Claim 11
Dependent Claim
33 words
The method as claimed in claim 7 wherein the step of exerting pressure against the outer face of said pressure disc comprises exerting said pressure against the peripheral region of the pressure disc.
Claim 12
Dependent Claim
54 words
The method as claimed in claim 8 including the step of positioning a rubber-like gasket material between the end of said cell chamber and said inner lens surface, said gasket havinG a pair of openings therein aligned with the pair of passageways in said cell chamber to allow passage of the optical beams therethrough.
Claim 13
Dependent Claim
33 words
The method as claimed in claim 9 including the step of heating said latter gasket material to fuse it to the end of the cell chamber and the inner face of said lens.
References Cited (Backward Citations)
US3391597A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-03-04 | 1977-09-03 | 1978-03-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-03-04 | 1981-09-03 | 1982-03-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-03-04 | 1985-09-03 | 1986-03-05 | $7700.00 | Window Closed / Lapsed |