WO1997028477A1 - Optical flow cell for use in spectral analysis - Google Patents
Optical flow cell for use in spectral analysis Download PDFInfo
- Publication number
- WO1997028477A1 WO1997028477A1 PCT/IL1996/000195 IL9600195W WO9728477A1 WO 1997028477 A1 WO1997028477 A1 WO 1997028477A1 IL 9600195 W IL9600195 W IL 9600195W WO 9728477 A1 WO9728477 A1 WO 9728477A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- flow cell
- probes
- optical
- optical flow
- end portion
- Prior art date
Links
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/36—Mechanical coupling means
- G02B6/38—Mechanical coupling means having fibre to fibre mating means
- G02B6/3807—Dismountable connectors, i.e. comprising plugs
- G02B6/3873—Connectors using guide surfaces for aligning ferrule ends, e.g. tubes, sleeves, V-grooves, rods, pins, balls
-
- 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
- G01N21/05—Flow-through cuvettes
-
- 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
- G01N2021/0346—Capillary cells; Microcells
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/36—Mechanical coupling means
- G02B6/38—Mechanical coupling means having fibre to fibre mating means
- G02B6/3807—Dismountable connectors, i.e. comprising plugs
- G02B6/3833—Details of mounting fibres in ferrules; Assembly methods; Manufacture
- G02B6/3854—Ferrules characterised by materials
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/36—Mechanical coupling means
- G02B6/38—Mechanical coupling means having fibre to fibre mating means
- G02B6/3807—Dismountable connectors, i.e. comprising plugs
- G02B6/3873—Connectors using guide surfaces for aligning ferrule ends, e.g. tubes, sleeves, V-grooves, rods, pins, balls
- G02B6/3874—Connectors using guide surfaces for aligning ferrule ends, e.g. tubes, sleeves, V-grooves, rods, pins, balls using tubes, sleeves to align ferrules
Definitions
- the invention refers to an optical flow cell for use in spectral analysis.
- the invention relates to optical flow cells for use in spectral analysis in association with suitable spectrometers, for example in liquid and gas chromatography.
- suitable spectrometers for example in liquid and gas chromatography.
- a stream of a monitored fluid is continuously flown though the flow cell and a radiation beam is transmitted across the flowing fluid and the exiting beam is detected and analyzed.
- Different designs of such optical flow cells are disclosed, for example, in US 4,540,280, 4,588,893, 5,078,493 and 5,151,474.
- optical flow cells of the kind specified comprise a housing with two intersecting throughgoing bores, one for the flow of a fluid to be analyzed and the other for the transmission of radiation which latter is fitted with means for directing the radiation towards and away from the bore.
- the two throughgoing bores form a fluid cavity and in order to ensure a desired length of an optical path across the fluid passing through the fluid cavity and to prevent the fluid from penetrating into the radiation transmitting bore, two oppositely located transparent windows are provided which separate the fluid cavity from the adjacent portions of the radiation transmitting bore.
- the windows are either mounted directly in the housing of the flow cell, such as for example in US 4,588,893, or they constitute the end faces of optical probes inserted in the radiation transmission bore through both ends thereof, such as for example in US 5,078,493.
- the radiation arriving at one end of the radiation transmit ⁇ ting bore is directed via a first transparent window to a fluid sample located inside the fluid cavity whilst radiation exiting from the sample across a second window is transmitted to a spectrometer.
- the windows In order to ensure in such prior art devices a high accuracy of measurement which in turn depends on the degree by which the dimensions of the fluid cavity correspond to design values, the windows must be appropriately manufactured and positioned so as to maximize the accuracy of compliance of the distance between the windows, known in the art as end separation, with the design value, and to minimize transverse and angular misalignments of the windows.
- the flow cell design must provide for a high degree of repeatability on each reassembly.
- specific measures must be taken for the windows to withstand extreme conditions, e.g. high pressure and/or high temperature, under which flow cells of the kind specified most often operate.
- an optical flow cell for use in spectral analysis of the kind that comprises a housing formed with intersecting first and second bores forming between them a fluid cavity, which first and second bores serve, respectively, for fluid throughflow and radiation transmission, said second bore holding in a fluid tight fit and releasable fashion two radiation transmitting optical probes having each an outer end portion and an inner end portion with an inner end face, the outer end portion of one probe being linked to a radiation source and the outer end portion of another probe being linked to a spectrometer, the inner end faces of the probes facing said fluid cavity and being spaced from each other; characterized in that each of said optical probes is an optical fiber cable having a ferrule mounted on the inner end portion of the cable and firmly held in an associated radiation transmitting bore section.
- the flow cell according to the present invention has a relatively simple construction in which the end faces of the fiber optic cables of the optical probes are in direct contact with the analyzed fluid whereby the need for windows is obviated.
- This enables mutually engaging surfaces of the ferrule and the housing, which are involved in setting of a required distance between the end faces of the optical probes, to be disposed relatively remote from the fluid cavity, whereby practically no fluid or at least no particles, if any, comprised therein can reach the engaging surfaces.
- the ferrules are selected from among materials, e.g. metals, which provide for the required mechanical properties and resistance to corrosion by the analyzed fluid.
- the housing is in the form of a sleeve coaxial with the radiation transmitting bore.
- each fiber optic probe is fitted with sealing means mounted, adjacent the inner end face thereof, between the ferrule of the probe and an end portion of the inner surface of the associated radiation transmitting bore section.
- the sealing means may be of any suitable kind such as, for example, an O-ring or where the ferrule and the sleeve are ferromagnetic, a ferrofluid material.
- the flow cell according to the present invention is especially advantageous when a small volume of an analyzed sample and consequently a small size fluid cavity are required.
- the required small dimension of the fluid cavity is readily achievable by mounting the fiber optic probes in such a manner that their end faces project into the fluid cavity to an appropriate extent and further by choosing a small diameter optical fiber cable.
- the fluid cell according to the present invention is specifically advantageous for use in IR analysis in general, and of liquid solutions in particular, which latter have very high absorption in the mid IR region and, therefore, put severe limitations on the length of the optical path.
- Fig. 1 is a cross-sectional view of a fiber optic flow cell according to the present invention
- Fig. 2 is a cross-sectional view of a section of the sleeve of the fiber optic flow cell shown in Fig. 1, drawn to a larger scale;
- Fig. 3 is a cross-sectional view of a fiber optic probe used in the fiber optic flow cell shown in Fig. 1;
- Fig. 4 shows portion A of the fiber optic flow cell shown in Fig. 1, drawn to a larger scale.
- the fiber optic flow cell according to the present invention shown in the drawings is adapted for use in spectrometric analysis, in particular for IR absorption measurements of fluids (liquids and gases).
- the fiber optic flow cell 1 comprises a cylindrical sleeve or adaptor 2, which is formed with a relatively broad radiation throughgoing bore 3 serving for radiation transmission and transversal fluid throughgoing bore 4 serving for the passage of a fluid F to be analyzed, bores 3 and 4 defining at their intersection a fluid cavity 5.
- the flow cell 1 further comprises two fiber optic probes 6 and 7 inserted into the radiation transmission bore 3 of the sleeve 2 at opposite ends 8, 9 thereof.
- One of the fiber optic probes, e.g. probe 6 transmits radiation R from a radiation source (not shown) to the fluid cavity 5 and the other probe 7 collects the radiation exiting from the fluid cavity 5 and transmitting it to a spectrometer (not shown).
- the fiber optic probes 6 and 7 of the flow cell 1 are identical and the structure of such a probe is schematically illustrated in Fig. 3. As shown, the probe is in the form of a transparent optical fiber cable 10 surrounded by a tubular ferrule 11, both the fiber and the ferrule being made of materials inert to the fluid to be analyzed.
- the ferrule 11 may be in the form of any standard connector.
- the fiber optical cable used in the flow cell may be of a single mode type, in which case it may have a diameter as small as 3-5 microns, or of the multi-mode type.
- the ferrule 11 is formed with a circumferential abutment shoulder 12 spaced from an end face 13 of the probe to an extent that ensures that when the two probes 6 and 7 are mounted in the radiation transmission bore 3 with the shoulders 12 of the probes abutting on the end surfaces 8 and 9 of sleeve 2, the end faces 13 of the probes project into the fluid cavity 5 to such an extent as to obtain a desired end separation therebetween.
- each fiber optic probe 6, 7 is provided with a sealing 14 mounted in a space between the radiation transmission bore 3 and the ferrule 11 of the probe 6, 7 adjacent the end face 12 thereof.
- the sealing 14 may be, for example, in the form of an O-ring (schematically shown in dotted lines in Fig. 3) or rather in the form of a ferrofluid material, in which case the ferrule and/or the sleeve or parts thereof should be made of magnetic material.
- the fiber optic probes 6, 7 are secured in the sleeve 2 by means of connector nuts 15.
- fluid F of which absorbance is to be measured is introduced into the fluid cavity 5 via one of the narrow fluid bores 4 and is discharged through the other bore 4 in a manner known per se and not designated in the drawings.
- the fluid is illuminated by a radiation beam delivered through one of the fiber optic probes, say probe 6.
- the radiation is transmitted across the fluid cavity 5, and is collected by fiber optic probe 7 and directed thereby to a spectrometer.
- the fluid cavity of the flow cell can have very small dimensions and, consequently, can provide for an extremely small volume of sample to be analyzed, about 30 pl, whereby a high optical sensitivity of the cell is achieved so that low concentration e.g.
- the fiber optic cell according to the present invention may have design features different from those described above.
- the flow cell may be employed for spectrometric analysis using radiation other than infrared, in which case the fluid cavity may have a longer optical path, i.e. the distance between the end faces of the fiber optic probes may be equal to or even be greater than the width of the transverse fluid flow bores.
- the sleeve may be other than cylindrical and may be held in an appropriate casing.
- the abutment shoulders of the probes may be constitut- ed by annular rims around their end faces. The shoulders may be adapted to abut on spacings arranged inside the sleeve rather than abutting on outer, end surfaces thereof.
- the fixed position of the fiber optic probes in the sleeve may be achieved by any other suitable means.
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Optical Measuring Cells (AREA)
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU11078/97A AU1107897A (en) | 1996-01-31 | 1996-12-30 | Optical flow cell for use in spectral analysis |
EP96941803A EP0817982A1 (en) | 1996-01-31 | 1996-12-31 | Optical flow cell for use in spectral analysis |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
IL11697296A IL116972A0 (en) | 1996-01-31 | 1996-01-31 | Optical flow cell for use in spectral analysis |
IL116972 | 1996-01-31 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1997028477A1 true WO1997028477A1 (en) | 1997-08-07 |
Family
ID=11068492
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/IL1996/000195 WO1997028477A1 (en) | 1996-01-31 | 1996-12-31 | Optical flow cell for use in spectral analysis |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP0817982A1 (en) |
AU (1) | AU1107897A (en) |
IL (1) | IL116972A0 (en) |
WO (1) | WO1997028477A1 (en) |
Cited By (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6008055A (en) * | 1998-06-30 | 1999-12-28 | Transgenomic, Inc. | Modular component fiber optic fluorescence detector system, and method of use |
WO2002075285A2 (en) * | 2001-03-19 | 2002-09-26 | E.I. Du Pont De Nemours And Company | Method and apparatus for measuring the color properties of fluids |
WO2004010115A1 (en) * | 2002-07-24 | 2004-01-29 | Polymicro Technologies, Llc | Flowcell in a ferrule and method of sealing |
EP2124036A1 (en) * | 2008-05-20 | 2009-11-25 | Agilent Technologies, Inc. | Pre-positioning and guiding mechanism for inserting a flow cell in a detector |
DE102010050679B3 (en) * | 2010-11-05 | 2012-03-01 | Institut Für Photonische Technologien E.V. | Adjustable receiving device for micro-fluidic chip with optical fiber for optical microscope, has chip shuttle which is arranged between side pieces and spacers by adjustable screw along long sides of side piece on base carrier |
EP2529198A4 (en) * | 2010-01-28 | 2014-02-19 | Ge Healthcare Bio Sciences Ab | Optical flow cell detector |
JP2018513415A (en) * | 2015-04-10 | 2018-05-24 | ジーイー・ヘルスケア・バイオサイエンス・アクチボラグ | Device for holding a light guide, method of manufacturing such a device and optical flow cell incorporating such a device |
US11137342B2 (en) | 2015-04-10 | 2021-10-05 | Cytiva Sweden Ab | Optical flow cell for an optical measuring device |
CN117538348A (en) * | 2023-11-17 | 2024-02-09 | 北京锐达仪表有限公司 | Plug-in high-precision radiation detection device with large measurement range |
Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4374620A (en) * | 1981-01-29 | 1983-02-22 | Altex Scientific, Inc. | Photometric flow cell |
US4707066A (en) * | 1983-10-12 | 1987-11-17 | Siemens Aktiengesellschaft | Glass fiber bushing through a wall opening of a housing and method of manufacture |
US4741589A (en) * | 1983-10-21 | 1988-05-03 | Alcatel N.V. | Coupler for optical waveguides |
JPH01129161A (en) * | 1987-11-16 | 1989-05-22 | Hitachi Ltd | Flow cell optical system for measuring particle |
US4844869A (en) * | 1985-09-09 | 1989-07-04 | Ord, Inc. | Immunoassay apparatus |
US5291030A (en) * | 1992-06-04 | 1994-03-01 | Torrex Equipment Corporation | Optoelectronic detector for chemical reactions |
US5302272A (en) * | 1992-03-05 | 1994-04-12 | Beckman Instruments, Inc. | Fiber optic flow cell for detection of electrophoresis separation with a capillary column and method of making same |
-
1996
- 1996-01-31 IL IL11697296A patent/IL116972A0/en unknown
- 1996-12-30 AU AU11078/97A patent/AU1107897A/en not_active Abandoned
- 1996-12-31 WO PCT/IL1996/000195 patent/WO1997028477A1/en not_active Application Discontinuation
- 1996-12-31 EP EP96941803A patent/EP0817982A1/en not_active Withdrawn
Patent Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4374620A (en) * | 1981-01-29 | 1983-02-22 | Altex Scientific, Inc. | Photometric flow cell |
US4707066A (en) * | 1983-10-12 | 1987-11-17 | Siemens Aktiengesellschaft | Glass fiber bushing through a wall opening of a housing and method of manufacture |
US4741589A (en) * | 1983-10-21 | 1988-05-03 | Alcatel N.V. | Coupler for optical waveguides |
US4844869A (en) * | 1985-09-09 | 1989-07-04 | Ord, Inc. | Immunoassay apparatus |
JPH01129161A (en) * | 1987-11-16 | 1989-05-22 | Hitachi Ltd | Flow cell optical system for measuring particle |
US5302272A (en) * | 1992-03-05 | 1994-04-12 | Beckman Instruments, Inc. | Fiber optic flow cell for detection of electrophoresis separation with a capillary column and method of making same |
US5291030A (en) * | 1992-06-04 | 1994-03-01 | Torrex Equipment Corporation | Optoelectronic detector for chemical reactions |
Cited By (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6008055A (en) * | 1998-06-30 | 1999-12-28 | Transgenomic, Inc. | Modular component fiber optic fluorescence detector system, and method of use |
US6752537B2 (en) | 2001-02-12 | 2004-06-22 | Polymicro Technologies, Llc | Connector ferrule and method of sealing |
US7911615B2 (en) | 2001-03-19 | 2011-03-22 | E. I. Du Pont De Nemours And Company | Method and apparatus for measuring the color properties of fluids |
WO2002075285A2 (en) * | 2001-03-19 | 2002-09-26 | E.I. Du Pont De Nemours And Company | Method and apparatus for measuring the color properties of fluids |
WO2002075285A3 (en) * | 2001-03-19 | 2003-01-16 | Du Pont | Method and apparatus for measuring the color properties of fluids |
US6888636B2 (en) | 2001-03-19 | 2005-05-03 | E. I. Du Pont De Nemours And Company | Method and apparatus for measuring the color properties of fluids |
WO2004010115A1 (en) * | 2002-07-24 | 2004-01-29 | Polymicro Technologies, Llc | Flowcell in a ferrule and method of sealing |
EP2124036A1 (en) * | 2008-05-20 | 2009-11-25 | Agilent Technologies, Inc. | Pre-positioning and guiding mechanism for inserting a flow cell in a detector |
EP2529198A4 (en) * | 2010-01-28 | 2014-02-19 | Ge Healthcare Bio Sciences Ab | Optical flow cell detector |
DE102010050679B3 (en) * | 2010-11-05 | 2012-03-01 | Institut Für Photonische Technologien E.V. | Adjustable receiving device for micro-fluidic chip with optical fiber for optical microscope, has chip shuttle which is arranged between side pieces and spacers by adjustable screw along long sides of side piece on base carrier |
JP2018513415A (en) * | 2015-04-10 | 2018-05-24 | ジーイー・ヘルスケア・バイオサイエンス・アクチボラグ | Device for holding a light guide, method of manufacturing such a device and optical flow cell incorporating such a device |
CN107683408B (en) * | 2015-04-10 | 2021-05-25 | 思拓凡瑞典有限公司 | Device for holding a light guide, method for the production thereof and optical flow cell incorporating the device |
US11137342B2 (en) | 2015-04-10 | 2021-10-05 | Cytiva Sweden Ab | Optical flow cell for an optical measuring device |
CN117538348A (en) * | 2023-11-17 | 2024-02-09 | 北京锐达仪表有限公司 | Plug-in high-precision radiation detection device with large measurement range |
Also Published As
Publication number | Publication date |
---|---|
EP0817982A1 (en) | 1998-01-14 |
AU1107897A (en) | 1997-08-22 |
IL116972A0 (en) | 1996-05-14 |
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