US20130335734A1 - Gas cell for the optical analysis of gases - Google Patents

Gas cell for the optical analysis of gases Download PDF

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Publication number
US20130335734A1
US20130335734A1 US13/885,178 US201113885178A US2013335734A1 US 20130335734 A1 US20130335734 A1 US 20130335734A1 US 201113885178 A US201113885178 A US 201113885178A US 2013335734 A1 US2013335734 A1 US 2013335734A1
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US
United States
Prior art keywords
outlet
measuring cell
inlet
gas
tubular chamber
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Abandoned
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US13/885,178
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English (en)
Inventor
Sven Krause
Yifei Wang
Lars Schomann
Gerhard Matz
Roland Harig
Jens Eichmann
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Bruker Optics GmbH and Co KG
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Bruker Optik GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Bruker Optik GmbH filed Critical Bruker Optik GmbH
Publication of US20130335734A1 publication Critical patent/US20130335734A1/en
Assigned to BRUKER OPTIK GMBH reassignment BRUKER OPTIK GMBH ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: WANG, YIFEI, SCHOMANN, LARS, HARIG, ROLAND, EICHMANN, JENS, KRAUSE, SVEN, MATZ, GERHARD
Abandoned legal-status Critical Current

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
    • G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
    • G01J3/02—Details
    • G01J3/0267—Sample holders for colorimetry
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
    • G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
    • G01J3/02—Details
    • G01J3/0205—Optical elements not provided otherwise, e.g. optical manifolds, diffusers, windows
    • G01J3/021—Optical elements not provided otherwise, e.g. optical manifolds, diffusers, windows using plane or convex mirrors, parallel phase plates, or particular reflectors
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/01—Arrangements or apparatus for facilitating the optical investigation
    • G01N21/03—Cuvette constructions
    • G01N21/031—Multipass arrangements
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/01—Arrangements or apparatus for facilitating the optical investigation
    • G01N21/11—Filling or emptying of cuvettes
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2201/00—Features of devices classified in G01N21/00
    • G01N2201/02—Mechanical

Definitions

  • the invention concerns a measuring cell for a gas analysis spectrometer with an inner chamber for a gas to be analyzed, an inlet and an outlet, wherein a traversing optical path for a measuring beam is formed in the inner chamber.
  • the optical analysis of gases is applied widely in various areas of technology. Special requirements are demanded by exhaust gas measurement applications for internal-combustion engines. Due to increasingly strict exhaust gas regulations, not only is a high level of sensitivity required to achieve a low detection threshold, but also a high time resolution to ensure a sufficiently good dynamic response of the measurement, in particular, with respect to non-stationary operating states of internal-combustion engines. This results in a conflict of objectives between detection sensitivity and the time resolution of the system. In such measuring cells for optical gas analysis devices, the detection sensitivity depends on the optical path length that the measuring beam travels through the gas to be analyzed in the measuring cell. This path length, in turn, depends on the inner chamber volume of the measuring cell and the guidance of the measuring beam.
  • the time resolution that is decisive for the dynamic response directly depends on the time needed to replace the gas to be analyzed in the measuring cell. It is important that the gas is replaced in its entirety. Increasing the volume of the measuring cell therefore has the disadvantage that, while other parameters remain constant, the time required to completely replace the gas increases, causing the time resolution and therefore the dynamic response to decrease correspondingly.
  • FIG. 7 schematically shows, in a measuring cell ( 9 ) according to prior art, swirling ( 91 ) of sample gas in the measuring cell causes formation of dead zones in which molecules of the sample gas can dwell for a comparatively long time, preventing fast exchange.
  • concentration of the supplied sample gas ( 90 ) changes, the previous concentration is still partly present so that the new concentration value can only be correctly determined once the gas in the dead zones has also been exchanged.
  • the resulting time delay causes carryover (concentration carryover), which in turn results in a long response time of the measuring cell and therefore of the entire measuring system.
  • the object of the invention is to create an improved measuring cell with a better dynamic response.
  • the inventive solution is a measuring cell with the characteristics of the independent claim.
  • Advantageous embodiments are the subject of the dependent claims.
  • the measuring cell for a gas analysis spectrometer with an inner chamber for a gas to be analyzed (sample gas) and an inlet and an outlet connected to it, an optical path traversing the inner chamber is formed for a measuring beam, wherein according to the invention, the measuring cell is constituted as a tube with the inlet and the outlet at opposite ends, and its inner chamber has a cross-sectional shape, which extends monotonically over the length of the tube, with an ovality at the start, which disappears toward the end.
  • Inlet describes a facility through which sample gas can flow into the inner chamber of the measuring cell.
  • outlet describes a facility through which it flows out.
  • the beginning of the measuring cell describes the region where the inlet is positioned.
  • the end of the region is that which leads to the outlet.
  • Monotonic means a change that occurs in one direction only.
  • An ovality that decreases monotonically along the length of the tube therefore means that at no point does the ovality increase along the length of the tube, not even intermittently.
  • the inventive measuring cell has a shape that is optimally adapted to the formation of a vortex at the inlet of the sample gas and the transformation of the vortex as it moves toward the outlet and in such a way that the flow of gas that moves from the inlet to the outlet fills the entire cell volume along a direct path.
  • the emphasis here is on a direct path, i.e. secondary curls or other fluidic figures do not have to be formed to exchange the gas in remote zones (dead zones).
  • the inventive shape avoids the existence of such dead zones, resulting in particularly fast gas exchange due to the exchange along a direct path.
  • the invention has recognized that the dynamic response of the measuring cell can be improved not only with a particularly small size of the cell volume but, in contrast to previous attempts in prior art, also with a larger size of measuring cell having a special shape.
  • This special shape is provided by the ovality on the inlet side, which disappears toward the outlet.
  • this special shape allows a particularly fast exchange of gas and produces the desired improvement in the dynamic response.
  • This invention therefore no longer relies on an especially small size of measuring cell, enabling the measuring cell to be larger and therefore more robust.
  • the invention therefore achieves a combination of advantages with respect to improved dynamic response and improved detectability. It achieves this in a surprisingly simple way, namely solely by ingenious shaping of the measuring cell. There is no example of this in prior art.
  • the inlets are preferably disposed in the tube casing. Disposing them thereby in the region of the start of the tube has the advantage, compared to positioning on the start end face, that reliable and fluidicly advantageous main vortex formation can be achieved. This particularly applies when the inlets are disposed diametrically opposite each other, and offset with respect to the central axis of the tube shape. This not only applies if two inlets are provided but also if more than two inlets are provided: in this case, they should be disposed in such a way that the sample gas initially flows into the tube tangentially. With this configuration, the inflowing sample gas can be induced to swirl. This results in stabilization of the flow and ensures the desired penetration of the entire inner chamber volume with the main vortex.
  • the outlets for the exiting sample gas are preferably constituted with an axial component. This is understood to mean that the outlets have an angle of maximum 30° with respect to the tube axis. Disposing them on the casing allows the mirror for the measuring beam to be disposed in the center. In this way, the end region can be optimally used for generating the optical path for the measuring beam. Furthermore, this outlet configuration has the advantage that unimpeded exit of the gas can be achieved due to the considerable tangential component.
  • the outlets are preferably tapered. This is understood to mean that at their start, i.e. in the region of their entry, they have the largest cross-section, which successively tapers the further it is from the inner chamber. It has been shown that a particularly good discharge characteristic from the inner chamber into the outlet of the sample gas can be achieved in this way, particularly with respect to the paucity or absence of reflections and the vortex or antivortex caused by them.
  • the ovality in the region of the outlet disappears completely. This is not absolutely necessary, a slight ovality (compared with the inlet) can remain.
  • the shape of the tube of the measuring cell in the region of the outlet is circular.
  • it is already circular at some distance (up to 1 ⁇ 3 of the total length of the tube) from the position where the outlet is disposed.
  • the cross-sections preferably have substantially equal surface areas despite being different in shape, wherein by “substantially” a deviation of no more than 15%, preferably 10% is understood.
  • the outlet will be disposed in the end region of the tube.
  • an additional element can be provided in addition to the tube, which has a cross-sectional shape that is inverse with respect to the tube. It is disposed in such a way that the non-oval side of the measuring body (i.e. its end) is connected to the correspondingly shaped beginning of the additional element, and the additional element changes to become oval along the length of the tube.
  • This intermediate element therefore provides a sort of continuation of the original measuring length. This is especially suitable for the detection of sample gases in especially low concentrations.
  • FIG. 1 A schematic representation of a measuring device with an inventive gas cell
  • FIG. 2 A representation of the gas cell showing the beam path
  • FIG. 3 A view from above onto the gas cell without its inlet and outlet;
  • FIG. 4 A sectional view of the gas cell
  • FIG. 5 An alternative embodiment of the gas cell
  • FIG. 6 An exploded view of the gas cell according to FIG. 2 ;
  • FIG. 7 A conventional gas cell.
  • FTIR Fourier transform infrared spectroscopy
  • An infrared light beam 10 from a source 11 for infrared radiation is focused onto an obliquely disposed beam splitter 12 of an interferometer, which is collectively designated by reference numeral 1 .
  • the IR beam 10 is divided into two components 10 a and 10 b , of which component 10 a is reflected by the beam splitter 12 to a fixed mirror 13 a , and component 10 b is allowed to pass through to a movable mirror 13 b , whose distance from the beam splitter 12 can be altered (symbolized by the dashed double-headed arrow in FIG. 1 ).
  • the partial beams 10 a , 10 b reflected back by the mirrors 13 a , 13 b interfere at beam splitter 12 and are together radiated as IR measuring beam 14 into a gas cell 2 .
  • the gas cell 2 is the actual measuring cell. Conventionally, it is constituted in the shape of a cell or vessel (cf. FIG. 7 ). It has an elongated basic body 20 with an inlet 21 at one end and an outlet 22 at the other end. The gas to be analyzed flows through the inlet 21 into the basic body, fills the latter and flows out again through the outlet 22 . While the gas dwells in the basic body 20 , the gas is irradiated by the measuring beam 14 . Depending on the composition and concentration of the gas in the gas cell 2 , different components of the spectrum of the measuring beam 14 will be absorbed and the remaining component that is allowed to pass through (transmitted) is projected onto a detector 15 .
  • Detector 15 is an MCT semiconductor detector, which converts the change in photon intensity into an electrical quantity. However, a photodiode, a bolometer or the like can also be used.
  • the signal measured by detector 15 is guided to an analog/digital converter 16 .
  • the interferogram 18 can be displayed on a suitable display device. Then, what is now a digital signal is processed by a transformation element 17 by means of fast Fourier transform (FFT). It is constituted to generate a spectral representation 19 from the interferogram provided by the analog/digital converter 16 in a known way and to display it.
  • FFT fast Fourier transform
  • gas cell 2 The functional and structural configuration of gas cell 2 is shown in FIGS. 2 to 6 .
  • the gas cell has an elongated, round hollow basic body 20 with a double-entry inlet 21 at one end and a double-entry outlet 22 at its other end.
  • the basic body has a cavity 23 , which is delimited by a casing 27 .
  • the cross-section of the cavity 23 in the basic body 20 is not constant but changes continually from inlet 21 to outlet 22 .
  • the shape of the cross-section of the cavity 23 has been chosen such that the cross-section is oval at inlet 21 and this ovality is increasingly reduced toward outlet 22 , until it practically disappears completely in the region of outlet 22 , i.e.
  • the cross-section is practically circular. This permits use of a round mirror 32 in the outlet region to reflect the measuring beam 14 and a polygonal mirror 31 in the region of the inlet cross-section.
  • the mirrors 31 , 32 have the same radius of curvature.
  • the inlets 21 are disposed on the basic body 20 , diametrically opposite along the longer axis of the oval, with a small offset in opposite directions (less than one tenth of the size of the width of the basic body 20 in this region) relative to the center axis 24 of the basic body 20 . In this way, it is ensured that the sample gas flowing in quickly fills the oval-shaped cross-section. An intended asymmetry is achieved by this offset with which the flow in the cavity 23 takes a preferred direction so that a defined vortex can form, which ensures fast mixture at the beginning and during continued flow of the sample gas toward outlet 22 . Because of the tapered cross-sectional shape, the vortex along the path to the outlet 22 gradually turns into a circular vortex and its peripheral speed slowly decreases.
  • the outlets are disposed diametrically opposite and oriented in such a way that they are tangential to the direction of flow (symbolized by arrow 5 ) from inlet 21 to outlet 22 and form an angle ⁇ of approx. 25° with respect to the center axis 24 .
  • the sample gas can exit the gas cell 2 via the outlets 22 in a way that is favorable to the flow.
  • the beam guidance with the IR source 11 and the detector 15 and the installation location with reference to the gas cell 2 are shown in FIG. 4 .
  • the measuring cell 2 represented in the embodiment is 16 cm long and has a 7.5-cm diameter.
  • a floor-sided pot 4 is provided beneath the actual gas cell 2 , in which the IR source 11 , the detector 15 , and the interferometer 1 are disposed.
  • the IR source and detector can also be disposed externally, in which case corresponding access openings for the inflow and outflow (represented by a dashed line) would have to be provided. They radiate through openings located at the edge of the polygonal mirror 31 (see reference figure 35 in FIG. 3 ).
  • the polygonal mirror 31 forms an envelope that is elliptical.
  • the gas cell 2 is closed at its top end by a cover 26 .
  • the round mirror 32 is disposed on the inside of the cover 26 so that it faces the polygonal mirror 31 .
  • the round mirror 32 is configured as a double mirror comprising two parallel concave mirrors 32 a , 32 b . Their radius of curvature is identical and dimensioned such that their focal points are located on the surface of the opposite mirror 31 .
  • Mirror 31 is also concave, wherein its focal point is aimed exactly onto the center of the two concave mirrors 32 a, b .
  • sample gas flowing in at inlet 21 is immediately caught by measuring beam 14 , which results in a very fast response time.
  • the sample gas is measured before it even has time to mix with the old gas still present in gas cell 2 .
  • changes to the composition and/or concentration in the sample gas are visible practically immediately.
  • the invention has also recognized that the claimed cross-sectional transition shape not only provides advantages in terms of minimizing the internal volume of the gas cell 2 but is also provides favorable conditions for flow.
  • a vortex is formed, which more or less fills the entire cross-section in the inlet area, and changes shape along its path to the outlet such that it acquires an increasingly circular cross-section.
  • the invention takes advantage of the behavior of the measuring gas vortex by adapting the cross-sectional shape of the gas cell precisely to this change in shape, thus having a cross-section along the entire length of the gas cell that is entirely filled by the flow. This effectively reduces the “dead zones,” which are critical to the response and precision. Because the gas exchange in the gas cell is faster than the measurement of an interferogram, a maximum dynamic response is achieved.
  • the long light path results in a high level of sensitivity.
  • the light fan produced between the polygonal mirror 31 and the circular mirror 32 is optimally adapted to the cross-sectional shape of the inner chamber. This results in practically the entire inner chamber being irradiated and, because of the complete filling with the flow described above, quickly being filled with the entering sample gas (without formation of the disturbing dead zones known from prior art).
  • the wide fanning in conjunction with the flow pattern produced by the special shape ensures a fast response. In this way, the inventive gas cell can provide two essential advantages at once.
  • an alternative embodiment is possible. It has an additional element 6 , which is directly connected to the gas cell 2 .
  • the cover 26 of the gas cell 2 is eliminated so that, together with the additional element, a large uniform cavity 23 ′ is produced.
  • the shape of the cavity in the additional element 6 is inverse, i.e. circular where it forms a connection with casing 27 of the gas cell 2 and oval at the outside end.
  • the additional element 6 is preferably constructed identically and connected to the coverless gas cell 2 in a “back-to-back” configuration. Inlet 21 is located at the base of gas cell 2 and inlet 22 ′ is located at the other end at the additional element 6 . With this configuration, the sensitivity can be almost doubled, wherein the advantageous shape of the gas cell 2 is retained due to the mirrored shape of the cavity of the additional element 6 .

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • General Health & Medical Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Health & Medical Sciences (AREA)
  • Investigating Or Analysing Materials By Optical Means (AREA)
  • Optical Measuring Cells (AREA)
US13/885,178 2010-11-19 2011-11-18 Gas cell for the optical analysis of gases Abandoned US20130335734A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE102010051928A DE102010051928B4 (de) 2010-11-19 2010-11-19 Gaszelle zur optischen Analyse von Gasen
DE102010051928.6 2010-11-19
PCT/EP2011/070462 WO2012066123A1 (de) 2010-11-19 2011-11-18 Gaszelle zur optischen analyse von gasen

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JP (1) JP2013543132A (pt-PT)
DE (1) DE102010051928B4 (pt-PT)
WO (1) WO2012066123A1 (pt-PT)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20170168275A1 (en) * 2015-12-15 2017-06-15 Horiba, Ltd. Multireflection cell, analyzer, exhaust gas analyzer, and light incident method
US11248954B2 (en) * 2019-06-27 2022-02-15 Gasmet Technologies Oy Back-to-back spectrometer arrangement

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104155241B (zh) * 2014-07-02 2016-08-24 合肥工业大学 一种光程可调的长程光学吸收池

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5550375A (en) * 1994-09-29 1996-08-27 Microparts Infrared-spectrometric sensor for gases
US6486474B1 (en) * 1999-08-13 2002-11-26 Regents Of The University Of Minnesota Infrared spectrometer for the measurement of isotopic ratios

Family Cites Families (23)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS49107792A (pt-PT) * 1973-02-19 1974-10-14
JPS603452U (ja) * 1983-06-22 1985-01-11 株式会社日立製作所 フロ−セル
DE3688679T2 (de) * 1985-09-09 1993-10-14 Commw Scient Ind Res Org Durchflusszelle zum analysieren von stoffen.
US4749276A (en) * 1986-01-23 1988-06-07 Mcdonnell Douglas Corporation Long path absorption cell
US5054920A (en) * 1989-10-10 1991-10-08 Axiom Analytical, Inc. Internal reflectance cell having improved sample flow geometry
DE4004989C2 (de) * 1990-02-19 1998-12-03 Fisher Rosemount & Co Geschaef Blasenabscheider, insbesondere für einen Flüssigkeitsspektralanalysator
JPH03109151U (pt-PT) * 1990-02-21 1991-11-08
US5204270A (en) * 1991-04-29 1993-04-20 Lacount Robert B Multiple sample characterization of coals and other substances by controlled-atmosphere programmed temperature oxidation
US5184192A (en) * 1991-07-17 1993-02-02 Millipore Corporation Photometric apparatus with a flow cell coated with an amorphous fluoropolymer
US5440143A (en) * 1994-02-25 1995-08-08 On-Line Technologies, Inc. Folded-path optical analysis gas cell
JP3228080B2 (ja) * 1995-08-07 2001-11-12 富士電機株式会社 多重反射形試料セル
JPH1062335A (ja) * 1996-08-14 1998-03-06 Fuji Electric Co Ltd 赤外線ガス分析計の測定セル
US5883721A (en) * 1997-07-11 1999-03-16 Waters Investments Limited Apparatus and process for measuring absorbance in fluid samples
JP2002202246A (ja) * 2000-12-28 2002-07-19 Anritsu Corp ガス検出装置
JP2002202249A (ja) * 2000-12-28 2002-07-19 Anritsu Corp ガス検出装置
JP2004533318A (ja) * 2001-05-17 2004-11-04 ピュアパルス テクノロジーズ インコーポレイテッド 光を使用して流体製品を処理するシステムに関する方法および装置
JP2002350341A (ja) * 2001-05-25 2002-12-04 Nok Corp 一酸化炭素濃度検出装置
JP2003065952A (ja) * 2001-08-24 2003-03-05 Kosu:Kk 溶存オゾン濃度計
DE10156149A1 (de) * 2001-11-15 2003-06-05 Manfred Muertz Apparatur zur Atemanalyse
DE10318786B4 (de) * 2003-04-25 2006-03-09 Nattkemper, Andreas, Dr.-Ing. FTIR-Messzelle zur Analyse aggressiver Gase
GB0519323D0 (en) * 2005-09-22 2005-11-02 Bann John R Scattering centre detector assembly and method
DE102006046265A1 (de) * 2005-09-28 2007-05-10 MKS Instruments, Inc., Wilmington Verlinktes erweiterbares Gasbeobachtungssystem für Infrarot-Absorbtionsspektroskopie
JP5695302B2 (ja) * 2009-04-03 2015-04-01 理研計器株式会社 複合型マルチパスセルおよびガス測定器

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5550375A (en) * 1994-09-29 1996-08-27 Microparts Infrared-spectrometric sensor for gases
US6486474B1 (en) * 1999-08-13 2002-11-26 Regents Of The University Of Minnesota Infrared spectrometer for the measurement of isotopic ratios

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20170168275A1 (en) * 2015-12-15 2017-06-15 Horiba, Ltd. Multireflection cell, analyzer, exhaust gas analyzer, and light incident method
US9971133B2 (en) * 2015-12-15 2018-05-15 Horiba, Ltd. Multireflection cell, analyzer, exhaust gas analyzer, and light incident method
US11248954B2 (en) * 2019-06-27 2022-02-15 Gasmet Technologies Oy Back-to-back spectrometer arrangement

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US20150185075A1 (en) 2015-07-02
US9279721B2 (en) 2016-03-08
DE102010051928A1 (de) 2012-05-24
DE102010051928B4 (de) 2012-08-09
JP2013543132A (ja) 2013-11-28
WO2012066123A1 (de) 2012-05-24

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