A sample cell can be designed to minimize excess gas volume. Described features can be advantageous in reducing an amount of gas required to flow through the sample cell during spectroscopic measurements, and in reducing a time (e.g. a total volume of gas) required to flush the cell between sampling
A sample cell can be designed to minimize excess gas volume. Described features can be advantageous in reducing an amount of gas required to flow through the sample cell during spectroscopic measurements, and in reducing a time (e.g. a total volume of gas) required to flush the cell between sampling events. In some examples, contours of the inners surfaces of the sample cell that contact the contained gas can be shaped, dimensioned, etc. such that a maximum clearance distance is provided between the inner surfaces at one or more locations. Systems, methods, and articles, etc. are described.
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1. A sample cell for laser absorption spectroscopy, the sample cell comprising: at least one opening for receiving a beam from a radiation source into an inner volume of the sample cell and for allowing the beam to exit the sample cell to contact a detector;an inner surface defining a boundary of th
1. A sample cell for laser absorption spectroscopy, the sample cell comprising: at least one opening for receiving a beam from a radiation source into an inner volume of the sample cell and for allowing the beam to exit the sample cell to contact a detector;an inner surface defining a boundary of the inner volume, the inner surface comprising a location at which a maximum clearance distance for gas flow between the inner surface and an opposing inner surface is less than approximately 75 times a characteristic dimension of a cross section of the beam,wherein the sample cell comprises a Herriott cell in which the beam traverses a distance between opposing mirrors a plurality of times between different points on the opposing mirrors with each reflection. 2. A sample cell as in claim 1, wherein the sample cell comprises an insert that occupies an excess gas volume within the inner volume through which the beam does not pass, and wherein an insert surface of the insert comprises at least part of the location. 3. A sample cell as in claim 2, wherein the insert comprises one or more of a flat insert, a conical insert, a hyperbolic insert, a trapezoidal insert, a cylindrical insert, and a hollow rod insert. 4. A sample cell as in claim 2, wherein the insert comprises a component volume configured to house one or more of an electronics component, a wiring component, a flow control component, and a scrubber component of a spectroscopy system. 5. A sample cell as in claim 2, wherein the insert comprises a gas conduit to feed gas to an inlet of the inner volume. 6. A sample cell as in claim 5, wherein the gas conduit comprises an inlet and a liquid drain that is separate from the inlet to divert liquids carried within the gas conduit away from the inner volume. 7. A sample cell as in claim 1, wherein the sample cell is configured as a tubular enclosure, a rectangular enclosure, a White cell, and a Pfund cell. 8. A sample cell as in claim 1, wherein the inner volume is at least partially contained within a gas passageway having at least one side wall and a length over which the beam travels at least once, the at least one side wall comprising the inner surface, and wherein the beam is reflected at least once from the at least one side wall as the beam travels through the gas passageway. 9. A sample cell as in claim 8, wherein the gas passageway is formed within a block by one or more of a boring process and a channeling process, and wherein the block comprises one or more parts that form the gas passageway. 10. A sample cell as in claim 8, wherein the gas passageway has a cross-sectional shape, and wherein over at least part of the length, the cross sectional shape comprises at least one of a circle, an ellipse, and a rectangle. 11. A sample cell as in claim 8, wherein the gas passageway is disposed such that the beam travels through the gas passageway from the source located near a first end of the gas passageway to the detector located near a second end of the gas passageway. 12. A sample cell as in claim 10, wherein the gas passageway is substantially collinear with an axis of propagation of the beam. 13. A sample cell as in claim 1, wherein the maximum clearance distance is in a range of approximately 3 to 10 times the characteristic dimension of the cross section of the beam or in a range of approximately 3 to 50 times the characteristic dimension of the cross section of the beam. 14. A sample cell as in claim 1, further comprising at least one reflective surface from which the beam is reflected at least one time. 15. A sample cell as in claim 14, wherein the at least one reflective surface comprises a mirror disposed at one end of the inner volume. 16. A sample cell as in claim 1, wherein the at least one location comprises at least one baffle feature that creates the maximum clearance distance for gas flow in at least one dimension. 17. A method comprising: receiving a beam from a radiation source into an inner volume of a sample cell and allowing the beam to exit the sample cell to contact a detector;defining a boundary of the inner volume with an inner surface, the inner surface comprising a location at which a maximum clearance distance for gas flow between the inner surface and an opposing inner surface is less than approximately 75 times a characteristic dimension of a cross section of the beam; andpassing a flowing gas stream through the sample cell, wherein the sample cell comprises a Herriott cell in which the beam traverses a distance between opposing mirrors a plurality of times between different points on the opposing mirrors with each reflection. 18. A method as in claim 17, wherein the maximum clearance distance is in a range of less than approximately 65 times the characteristic dimension of the cross section of the beam. 19. A sample cell as in claim 1, wherein the characteristic dimension of a cross section of the beam is less than a diameter or width of the at least one opening. 20. A sample cell as in claim 1, wherein the characteristic dimension of a cross section of the beam is approximately 300 μm to 1000 μm.
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이 특허에 인용된 특허 (10)
Carey Glen A. (North Ridgeville OH) Hydo Steven J. (Wellington OH), Combination absorbance fluorescence aspirating thermal cuvette.
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