GB2071355A - Liquid cell for spectroscopic analysis - Google Patents
Liquid cell for spectroscopic analysis Download PDFInfo
- Publication number
- GB2071355A GB2071355A GB8107074A GB8107074A GB2071355A GB 2071355 A GB2071355 A GB 2071355A GB 8107074 A GB8107074 A GB 8107074A GB 8107074 A GB8107074 A GB 8107074A GB 2071355 A GB2071355 A GB 2071355A
- Authority
- GB
- United Kingdom
- Prior art keywords
- cell
- liquid
- back plate
- reflecting surface
- plate
- 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.)
- Withdrawn
Links
Classifications
-
- 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
Abstract
A liquid cell for use in spectroscopic analysis of flowing liquids formed by a front plate (1) as an optical window, a back plate (2) providing a reflecting surface (6), and a sealing means (3) between the two plates. In the back plate there are entry part (4) and exit part (5) for liquids to the cell. This arrangement is convenient to connect for liquid through-put, and gives extra sensitivity and allows detection of very small quantities of material present in the flow. <IMAGE>
Description
SPECIFICATION
Liquid cell for spectroscopic analysis
This invention relates to a liquid cell for use in spectroscopic analysis of flowing liquids.
In conventional liquid cells for this purpose light is shone through a cell formed by two parallel windows with the liquid flowing therebetween.
Problems arise with introducing liquid into such cells.
According to the invention there is provided a liquid cell defined by a front plate forming an optical window, a back plate providing a reflecting surface, sealing means for retaining liquid between the plate and entry and exit parts for liquid to the cell.
By having a reflecting back plate it is far easier to provide for connections for leading the liquid to the cell which do not interfere with the optical system. In a preferred embodiment the entry and exit ports are formed in the back plate, with the reflecting surface extending on the back plate between the ports. Having the ports on the back plates allows very easy connections for the liquid through-put, and also simplifies sealing of the front window to the back plate.
A specific embodiment of the invention will now be described by way of example with reference to the accompanying drawings in which Fig. 1 is a sectional view through the cell, and
Fig. 2 is an exploded perspective view of the cell. The Figures are not to scale.
In the drawings there is shown a first plate which is an optical window 1, a stainless steel back plate 2 and a sealing gasket 3 for positioning therebetween. The optical window 1 is clamped to the steel plate 2 with the gasket therebetween by conventional clamping means (not shown). The steel plate 2 has an inlet 4 for liquid and an outlet 5 for liquid and lying therebetween is a polished surface 6 suitable for reflecting an optical beam.
The dimensions of the cell are suitably 15 mm in length, with a breadth of 6 mm and a thickness of 0.15 mm. The thickness can be varied by using different gaskets to vary the size of the gap between the optical window and the steel back plate. The gasket can suitably be made of P.T.F.E.
The reflecting surface of the back plate 2 can be slightly curved or tapered so that the path length across the cell changes. The change in path length is equal to or greater than the difference in wave lengths between the upper and lower limits of the range of radiation used. This leads to a condition of near uniform interference throughout the spectral range and results in the absence of interference fringe effects in the recorded spectrum.
Each of the inlet 4 and outlet 5 are formed as a circular hole on the outside of the back plate which tapers to an inclined triangular transition on the inside of the back plate, in the form of a rightangled equilateral triangle. This ensures smooth flow throughout the cell.
Particular advantages of this cell are that with a very simple construction it has a very small volume, of the order of microlitres, and that an optical beam shown schematically at 7 is reflected back from the mirrored wall of the cell and passes through volume of liquid twice. This arrangement gives extra sensitivity and allows detection of very small quantities of material present in the flow. It can be used for example, as an auxiliary specific detector for liquid chromatography. The dimensions of the cell embodiment given above are suitable for it being used with known commercial spectrometers. The optical systems used will of course require adapting so that the spectrometer beam is passed into the cell and the reflected beam from the cell is passed onto the spectrometer for analysis.
The cell is particularly suitable for detecting transient constituents in flowing liquids. With the chosen dimensions minimum mixing occurs during passage of the liquid through the cell. This is assisted by shaping of the inlet and outlet.
The optical transmission of the complete device is about 60% in the infra-red range. If desired the reflecting surface can have a special coating to increase reflectivity.
1. A liquid cell for use in spectroscopic analysis of flowing liquids formed by a front plate as an optical window, a back plate providing a reflecting surface, and a sealing means between said two plates, and there is an entry and an exit port for liquids to the cell.
2. A liquid cell according to claim 1 wherein said entry and exit ports are both formed in said back plate.
3. A liquid cell according to claim 2 wherein said entry and exit ports are formed as a circular hole on the outside of said back plate which opens to a triangular taper on the inside of said back plate.
4. A liquid cell according to any one of the preceding claims wherein the dimensions of said cell are about 15 mm in length, a breadth of about 6 mm and a thickness of about 0.1 5 mm.
5. A liquid cell according to any one of the preceding claims wherein the back plate is metal.
6. A liquid cell according to any one of the preceding claims wherein said reflecting surface has a coating to increase reflectivity.
7. A liquid cell according to any one of the preceding claims wherein the reflecting surface is non-parallel with the window whereby the path length between them varies along the cell.
8. A liquid cell substantially as herein described with reference to the accompanying drawings.
9. A liquid spectrometer incorporating a cell
**WARNING** end of DESC field may overlap start of CLMS **.
Claims (10)
1. A liquid cell for use in spectroscopic analysis of flowing liquids formed by a front plate as an optical window, a back plate providing a reflecting surface, and a sealing means between said two plates, and there is an entry and an exit port for liquids to the cell.
2. A liquid cell according to claim 1 wherein said entry and exit ports are both formed in said back plate.
3. A liquid cell according to claim 2 wherein said entry and exit ports are formed as a circular hole on the outside of said back plate which opens to a triangular taper on the inside of said back plate.
4. A liquid cell according to any one of the preceding claims wherein the dimensions of said cell are about 15 mm in length, a breadth of about 6 mm and a thickness of about 0.1 5 mm.
5. A liquid cell according to any one of the preceding claims wherein the back plate is metal.
6. A liquid cell according to any one of the preceding claims wherein said reflecting surface has a coating to increase reflectivity.
7. A liquid cell according to any one of the preceding claims wherein the reflecting surface is non-parallel with the window whereby the path length between them varies along the cell.
8. A liquid cell substantially as herein described with reference to the accompanying drawings.
9. A liquid spectrometer incorporating a cell according to any one of the preceding claims.
10. A liquid spectrometer incorporating a cell according to claim 7 wherein the degree of variation in path length corresponds to the difference in wave length of the upper and lower wave lengths of the radiation used.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB8107074A GB2071355A (en) | 1980-03-10 | 1981-03-06 | Liquid cell for spectroscopic analysis |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB8008052 | 1980-03-10 | ||
GB8107074A GB2071355A (en) | 1980-03-10 | 1981-03-06 | Liquid cell for spectroscopic analysis |
Publications (1)
Publication Number | Publication Date |
---|---|
GB2071355A true GB2071355A (en) | 1981-09-16 |
Family
ID=26274752
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB8107074A Withdrawn GB2071355A (en) | 1980-03-10 | 1981-03-06 | Liquid cell for spectroscopic analysis |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB2071355A (en) |
Cited By (16)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0158948A2 (en) * | 1984-04-14 | 1985-10-23 | Firma Carl Zeiss | Flow-through cuvette for nanoliter volumes |
EP0163847A2 (en) * | 1984-04-14 | 1985-12-11 | Firma Carl Zeiss | Interferential refractometer |
EP0182618A2 (en) * | 1984-11-15 | 1986-05-28 | Wyatt Technology Corporation | Sample cell for light scattering measurements |
GB2234348A (en) * | 1986-12-04 | 1991-01-30 | Univ Leicester | Apparatus for treating specimens with liquids |
EP0638799A1 (en) * | 1993-08-11 | 1995-02-15 | Yissum Research Development Company Of The Hebrew University Of Jerusalem | A flow cell device for the monitoring of blood or any other cell suspension |
DE19647644A1 (en) * | 1996-11-18 | 1998-05-20 | Fraunhofer Ges Forschung | Micromechanical transmission measuring cell and reactor for sample fluid |
US6490034B1 (en) | 1996-11-18 | 2002-12-03 | Fraunhofer-Gesellschaft Zur Foerderung Der Angewandten Forschung E.V. | Micromechanical transmission measuring cell |
WO2006026342A1 (en) * | 2004-08-26 | 2006-03-09 | The Government Of The United States Of America, As Represented By The Secretary, Department Of Health And Human Services | Flow-through, thermal-expansion-compensated cell for light spectroscopy |
DE102007019695A1 (en) * | 2007-04-24 | 2008-10-30 | Analytik Jena Ag | Cuvette for the optical analysis of small volumes |
EP2017601A2 (en) | 2007-07-18 | 2009-01-21 | The Government of the United States of America, represented by the Secretary, Department of Health and Human Services | Flow-through, inlet-gas-temperature-controlled, solvent-resistant, thermal-expansion compensated cell for light spectroscopy |
EP1458483B1 (en) * | 2001-09-28 | 2014-01-08 | ibidi GmbH | Flow chamber |
DE102014011041A1 (en) | 2014-07-23 | 2016-01-28 | Leibniz-Institut für Photonische Technologien e. V. | Optical flow-through hollow fiber, process for its production and its use |
WO2019045984A1 (en) * | 2017-09-01 | 2019-03-07 | Instrumentation Laboratory Company | Optical flow cell apparatus and method for reducing deflection of sample chamber |
US10288556B2 (en) | 2016-04-21 | 2019-05-14 | Instrumentation Laboratory Company | Optical flow cell apparatus and method for reducing deflection of sample chamber |
US10324025B2 (en) | 2016-04-21 | 2019-06-18 | Instrumentation Laboratory Company | Optical flow cell and test head apparatus |
CN114112977A (en) * | 2021-11-22 | 2022-03-01 | 哈尔滨爱威斯医药科技有限公司 | Quick detection device of medicine raw materials |
-
1981
- 1981-03-06 GB GB8107074A patent/GB2071355A/en not_active Withdrawn
Cited By (27)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0158948A2 (en) * | 1984-04-14 | 1985-10-23 | Firma Carl Zeiss | Flow-through cuvette for nanoliter volumes |
EP0163847A2 (en) * | 1984-04-14 | 1985-12-11 | Firma Carl Zeiss | Interferential refractometer |
EP0163847A3 (en) * | 1984-04-14 | 1986-08-13 | Firma Carl Zeiss | Interferential refractometer |
EP0158948A3 (en) * | 1984-04-14 | 1987-05-06 | Firma Carl Zeiss | Flow-through cuvette for nanoliter volumes |
EP0182618A2 (en) * | 1984-11-15 | 1986-05-28 | Wyatt Technology Corporation | Sample cell for light scattering measurements |
EP0182618A3 (en) * | 1984-11-15 | 1986-12-30 | Wyatt Technology Company | Sample cell for light scattering measurements |
GB2234348A (en) * | 1986-12-04 | 1991-01-30 | Univ Leicester | Apparatus for treating specimens with liquids |
GB2234348B (en) * | 1986-12-04 | 1991-07-31 | Univ Leicester | Apparatus for reactions on a specimen with liquids |
EP0638799A1 (en) * | 1993-08-11 | 1995-02-15 | Yissum Research Development Company Of The Hebrew University Of Jerusalem | A flow cell device for the monitoring of blood or any other cell suspension |
DE19647644A1 (en) * | 1996-11-18 | 1998-05-20 | Fraunhofer Ges Forschung | Micromechanical transmission measuring cell and reactor for sample fluid |
DE19647644C2 (en) * | 1996-11-18 | 1999-04-15 | Fraunhofer Ges Forschung | Micromechanical transmission measuring cell |
US6490034B1 (en) | 1996-11-18 | 2002-12-03 | Fraunhofer-Gesellschaft Zur Foerderung Der Angewandten Forschung E.V. | Micromechanical transmission measuring cell |
EP1458483B1 (en) * | 2001-09-28 | 2014-01-08 | ibidi GmbH | Flow chamber |
WO2006026342A1 (en) * | 2004-08-26 | 2006-03-09 | The Government Of The United States Of America, As Represented By The Secretary, Department Of Health And Human Services | Flow-through, thermal-expansion-compensated cell for light spectroscopy |
US7894055B2 (en) | 2004-08-26 | 2011-02-22 | The United States Of America As Represented By The Department Of Health And Human Services | Flow-through, inlet-gas-temperature-controlled, solvent-resistant, thermal-expansion compensated cell for light spectroscopy |
US7355697B2 (en) | 2004-08-26 | 2008-04-08 | The United States Of America As Represented By The Department Of Health And Human Services | Flow-through, thermal-expansion-compensated cell for light spectroscopy |
DE102007019695A1 (en) * | 2007-04-24 | 2008-10-30 | Analytik Jena Ag | Cuvette for the optical analysis of small volumes |
DE102007019695B4 (en) * | 2007-04-24 | 2009-08-13 | Analytik Jena Ag | Cuvette for the optical analysis of small volumes |
EP2017601A2 (en) | 2007-07-18 | 2009-01-21 | The Government of the United States of America, represented by the Secretary, Department of Health and Human Services | Flow-through, inlet-gas-temperature-controlled, solvent-resistant, thermal-expansion compensated cell for light spectroscopy |
EP2017601A3 (en) * | 2007-07-18 | 2010-03-03 | The Government of the United States of America as Represented by The Department of Health and Human Services | Flow-through, inlet-gas-temperature-controlled, solvent-resistant, thermal-expansion compensated cell for light spectroscopy |
DE102014011041A1 (en) | 2014-07-23 | 2016-01-28 | Leibniz-Institut für Photonische Technologien e. V. | Optical flow-through hollow fiber, process for its production and its use |
US10288556B2 (en) | 2016-04-21 | 2019-05-14 | Instrumentation Laboratory Company | Optical flow cell apparatus and method for reducing deflection of sample chamber |
US10324025B2 (en) | 2016-04-21 | 2019-06-18 | Instrumentation Laboratory Company | Optical flow cell and test head apparatus |
US10564095B2 (en) | 2016-04-21 | 2020-02-18 | Instrumentation Laboratory Company | Optical flow cell apparatus and method for reducing deflection of sample chamber |
WO2019045984A1 (en) * | 2017-09-01 | 2019-03-07 | Instrumentation Laboratory Company | Optical flow cell apparatus and method for reducing deflection of sample chamber |
CN111328369A (en) * | 2017-09-01 | 2020-06-23 | 仪器实验室公司 | Optical flow cell apparatus and method for reducing sample chamber deflection |
CN114112977A (en) * | 2021-11-22 | 2022-03-01 | 哈尔滨爱威斯医药科技有限公司 | Quick detection device of medicine raw materials |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
WAP | Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1) |