WO2003060492A1 - Refraktometer - Google Patents
Refraktometer Download PDFInfo
- Publication number
- WO2003060492A1 WO2003060492A1 PCT/EP2002/014586 EP0214586W WO03060492A1 WO 2003060492 A1 WO2003060492 A1 WO 2003060492A1 EP 0214586 W EP0214586 W EP 0214586W WO 03060492 A1 WO03060492 A1 WO 03060492A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- liquid
- measuring
- refractometer according
- refractometer
- sample
- Prior art date
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/02—Food
- G01N33/14—Beverages
- G01N33/143—Beverages containing sugar
-
- 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
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/41—Refractivity; Phase-affecting properties, e.g. optical path length
- G01N21/43—Refractivity; Phase-affecting properties, e.g. optical path length by measuring critical angle
- G01N21/431—Dip refractometers, e.g. using optical fibres
Definitions
- the invention relates to a refractometer for determining the refractive index of a liquid and any variables derived therefrom, such as, for example, a sugar concentration, with a sensor arrangement which has a radiation source for generating a measuring beam, a radiation detector for detecting the measuring beam and one of them
- Measuring beam to be traversed on which a measuring surface to be wetted by the liquid is arranged, with which the measuring beam interacts.
- Refractometers of this type are used as digital or analog measuring devices, for example for determining the concentration of certain substances dissolved in a liquid and influencing the refractive index. For example, the determination of the sugar content of the grape juice is an important area of application for such measurements in the field of inbreeding.
- measuring devices Two types of measuring devices are known in this field, the first of which requires the taking of a sample and the introduction of the sample into the measuring device, for example by instillation, while the other design requires the immersion of a sensor in the analyte, i.e. in the liquid to carry out the measurement.
- the sampling is relatively cumbersome and time-consuming and it is necessary to clean the measuring device thoroughly before taking a new sample.
- the second variant of measuring devices results in often as a problem that the refractometer has a different temperature than the analyte, so that the necessary temperature compensation when determining the temperature-dependent refractive index is very difficult to carry out. It can also be difficult to take into account the influence of extraneous light in the optical measurement when inserting a probe into the analyte.
- the measuring device can simply be used in such a way that a measuring tip is immersed in the liquid and the corresponding signal is recognized on the hand-held device. The temperature of the liquid is not taken into account in the measurement.
- the present invention is based on the object of a simply constructed refractometer at the beginning of the type mentioned in such a way that on the one hand simple and quick handling is made possible and on the other hand effective temperature compensation is ensured.
- the object is achieved in that the measuring surface is arranged in a test well of a penetration probe that can be inserted into the liquid.
- the construction according to the invention enables sampling and measurement by means of a penetration probe which, on the one hand, can be introduced into the liquid and, on the other hand, contains the sample trough in which the refractive index or refractive index is measured after the liquid to be measured has been removed. Since only a small volume of liquid remains in the sample well, a temperature compensation takes place quickly between the penetration probe and the liquid, so that the refractometer and the liquid have the same temperature during the measurement. In addition, temperature compensation is easily possible by measuring the temperature at the probe. For this purpose, a temperature sensor can be arranged inside the penetration probe.
- the penetration probe simply has to be immersed in a liquid once more, and the test well can optionally be briefly cleaned beforehand if this appears necessary in the course of handling the liquids to be measured. Otherwise it is also conceivable to simply reinsert the probe into the liquid, the liquid measured during the first measurement being washed out of the sample well by the further liquid.
- the refractometer according to the invention thus considerably simplifies sampling and, if appropriate, also repeated use in a measurement, and the possibilities for effective temperature compensation are also given.
- the piercing probe can, for example, be pointed at its end in order to make it possible to pierce larger fruits directly in order to measure the fruit juice contained in them.
- a groove can also be provided on the surface of the penetration probe, through which the liquid to be measured can flow after a slight immersion in the liquid level or a fruit can flow towards the test well.
- An advantageous embodiment of the invention provides that the measuring surface is limited by a lens body.
- the lens body is arranged such that it can be wetted by the liquid on one side and that the surface of the lens body is kept free of the liquid on the other side.
- the radiation source and the radiation detector are then arranged on the side of the lens body which is kept free from the liquid, so that the measuring beam from the radiation source falls into the lens body, is at least partially reflected there on the measuring surface wetted by the liquid and is then directed to the radiation detector can be.
- the intensity of the reflected measuring beam is then dependent on the ratio of the refractive indices of the lens body and the liquid wetting it.
- the design of the geometry of the lens body is advantageously carried out in such a way that the measuring beam is bundled or remains bundled in the lens body and that a suitable arrangement of the radiation source and the radiation detector can be selected with respect to the lens body.
- Another advantageous embodiment of the invention provides that the measuring surface is limited by a glass body.
- Vitreous body is limited, the cleaning of the measuring surface after the measurement is carried out simplified without the measuring surface being scratched.
- an effective temperature compensation between the sensor arrangement and the liquid is ensured by the relatively good thermal conductivity of the glass.
- the invention is advantageously embodied in that the radiation source, the radiation detector and the lens body or, if appropriate, the glass body are held in a metallic receptacle, which consists in particular of steel or aluminum.
- the design of the receptacle made of a stable material in the form of steel or aluminum means that the geometrical arrangement of the radiation source, the detector and the lens is so stable that there is no fear of a change in the measuring section even due to impacts. Due to the design made of a metal, a very quick and effective temperature adjustment takes place between the individual elements of the sensor arrangement and the liquid in the test well. The temperature adjustment can be improved by contact of liquid and metallic absorption.
- thermosensor it is also advantageous to integrate a temperature sensor in the area of the sensor arrangement.
- the temperature of the sensor arrangement and the flux can be measured simultaneously with the measurement of the temperature-dependent refractive index.
- liquid can be measured after they are aligned, which is the case after a few seconds.
- the measured refractive index of the liquid can then be converted to a standard temperature in an evaluation device, taking into account the measured temperature. Since only a single temperature has to be taken into account for compensation in the sensor arrangement according to the invention, the calibration of the sensor arrangement is also greatly simplified.
- the metallic receptacle is coated with a material, in particular a plastic, whose thermal conductivity is lower than that of the material of the receptacle.
- the temperature of the sample taken from a liquid is largely adjusted to the temperature of the sensor arrangement, regardless of the ambient temperature, by the thermal contact in the sample well, and the refractive index is measured at this temperature.
- this temperature is advantageously measured in the interior of the refractometer in the area of the sensor arrangement by a temperature sensor in order to take temperature influences into account or to be able to relate the measurement result to a standard temperature.
- the lens body or the glass body of a Mate is in particular greater than 2.
- the refractive index of the lens is preferably 1.85.
- a high refractive index of the vitreous is advantageous if liquids with likewise high electricity constants or refractive indices are to be measured.
- the sample well advantageously has a volume of less than one milliliter.
- the sensor arrangement can advantageously be designed in that the radiation source is formed by an infrared light-emitting diode and the radiation detector is formed by a semiconductor which is sensitive in the infrared region.
- the refractometer advantageously has a lens body which has an area with a greater curvature which faces the radiation source and the radiation detector and an area with a smaller curvature which delimits the measuring surface.
- an optimal guidance of the measuring beam is connected with a measurement-technically optimal design of the measuring surface, the measuring surface being additionally easy to clean.
- the invention is shown on the basis of an exemplary embodiment in a drawing and described below.
- FIG. 1 shows the internal structure of the sensor arrangement schematically
- FIG. 2 schematically shows a puncture probe
- FIG. 3 shows an evaluation device of the refractometer according to the invention.
- the sensor arrangement with the radiation source 1 in the form of an infrared light-emitting diode, the radiation detector 2 in the form of a light-sensitive semiconductor diode and the measuring section in between are described schematically there.
- a measuring beam is emitted towards the lens body 3 made of glass and enters through the spherical or approximately spherical surface perpendicularly into the glass body, through which it spreads up to the measuring surface 4, which through a flat boundary surface of the Lens body 3 is formed.
- the measuring beam is reflected or partially broken into the liquid depending on the ratio of the refractive indices (refractive indices) of the material of the lens body and the substance of the liquid 5 with which the lens body is wetted.
- At least a part of the beam is possibly reflected on the measuring surface 4 towards the radiation detector 2 and picked up by the latter.
- the detected radiation intensity is measured with the aid of the radiation detector 2 and is a measure of the refractive index of the liquid 5.
- the measurement is compared to a reference measurement which was carried out either without a wetting liquid on the lens body 3 or with a known liquid ,
- the orientation of the lens on the one hand makes the introduction of the measuring beam into the lens body 3 and the exit to the radiation detector particularly low-loss, on the other hand, the entry of extraneous light into the lens body 3 is made more difficult by the flat measuring surface 4.
- the cleaning of the measuring surface 4 on its outside, which is exposed to the liquids 5 to be measured, is also facilitated by the flat design.
- the lens typically has a diameter of 3 mm and a refractive index greater than 1.5, in particular greater than 2.
- the radiation source 1 and the radiation detector 2 are each arranged in bores within the receiving body 6, as a result of which they are reliably and immovably fixed in their position relative to one another and to the lens body 3.
- the imitation body 6, which consists of a metal, for example steel or aluminum, ensures excellent heat conduction, so that the elements 1, 2, 3 of the Sensor arrangement are reliably kept at the same temperature as the receptacle 6, and the small sample size of the liquid 5 ensures that the sample by means of the glass lens body 3 is very quickly at the same temperature as the receptacle body 6 by heat transport.
- the sample 1 shows a small sample in the form of a drop of a liquid 5 lying on the lens body 3, but it can also be provided that the sample trough 7 is regularly completely filled up to its edge. In any case, the temperature equalization between the sample and the receiving body 6 takes only a few seconds.
- the sample well has a volume of less than 1 ml, in particular less than 0.5 ml.
- a temperature sensor 8 is additionally provided in the receiving body 6, which allows temperature compensation when evaluating the measurements.
- the receiving body 6 is provided with a plastic layer 19 which insulates it thermally and thus protects the sensor arrangement from changing external influences.
- a plastic layer 19 which insulates it thermally and thus protects the sensor arrangement from changing external influences.
- the edge area of the lens body 3 the latter is sealed off from the plastic layer 19 and the receiving body 6 by means of elastic seals 20.
- FIG. 1 shows an external view of a handheld refractometer with a handle 9, in which a digital display 10 is integrated.
- An evaluation device is located in the body of the handheld refractometer. device housed, which evaluates the data supplied by the radiation detector 2 and the temperature sensor 8.
- the sensor arrangement is arranged in the vicinity of the piercing tip 11, specifically under the sample trough 7.
- the lens body 3 can be seen as a circle.
- the piercing tip 11 is designed such that it can be inserted into a fruit, so that the fruit juice contained in the fruit gets into the test well 7.
- the piercing tip 11 is immersed in a liquid and that it has a groove-like notch on its upper side which leads to the test well 7 and allows a test liquid to run into the test well 7, even without the Piercing tip 11 is dipped deep into the liquid or is inserted into the fruit. Otherwise the puncture tip is inserted into the analyzer until the sample well fills up.
- the mode of operation of the refractometer will now be briefly explained schematically on the basis of FIG.
- the measuring beam 12 is generated by the radiation source 1 in the form of an infrared beam which, in the schematic illustration of FIG. 1, propagates along the central axis of the receiving bore 13 of the radiation source 1 to the measuring surface 4, is reflected there and from there along the The central axis of the receiving bore 14 of the radiation detector 2, also shown in dash-dotted lines, continues.
- the intensity of the reflected measuring beam 12 is measured in the radiation detector 2.
- the measured intensity is passed to the evaluation device 15, in which a first computing device 16 first takes into account a value for the current refractive index or without taking into account the temperature on the basis of reference values the refractive index is calculated.
- This value calculated from the measurement is then related to a reference temperature in the second computing device 17, taking into account the temperature value measured by means of the temperature sensor 8 and likewise given to the evaluation device 15, and the temperature influence is thus compensated for.
- the value thus calculated and corrected for the refractive index or the refractive index is then given to a display 18 and output to the user there by means of a digital display.
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- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Health & Medical Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Engineering & Computer Science (AREA)
- Food Science & Technology (AREA)
- Medicinal Chemistry (AREA)
- Investigating Or Analysing Materials By Optical Means (AREA)
Abstract
Description
Claims
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10/476,749 US7064816B2 (en) | 2002-01-21 | 2002-12-19 | Refractometer |
BR0209264-6A BR0209264A (pt) | 2002-01-21 | 2002-12-19 | Procedimento para operação de um refratÈmetro |
EP02793090A EP1468272B1 (de) | 2002-01-21 | 2002-12-19 | Refraktometer |
DE50207885T DE50207885D1 (de) | 2002-01-21 | 2002-12-19 | Refraktometer |
JP2003560538A JP2005515433A (ja) | 2002-01-21 | 2002-12-19 | 屈折計 |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10202117.1 | 2002-01-21 | ||
DE10202117A DE10202117C2 (de) | 2002-01-21 | 2002-01-21 | Refraktometer |
Publications (2)
Publication Number | Publication Date |
---|---|
WO2003060492A1 true WO2003060492A1 (de) | 2003-07-24 |
WO2003060492A8 WO2003060492A8 (de) | 2003-11-27 |
Family
ID=7712658
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP2002/014586 WO2003060492A1 (de) | 2002-01-21 | 2002-12-19 | Refraktometer |
Country Status (5)
Country | Link |
---|---|
US (1) | US7064816B2 (de) |
JP (1) | JP2005515433A (de) |
BR (1) | BR0209264A (de) |
DE (2) | DE10202117C2 (de) |
WO (1) | WO2003060492A1 (de) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2021126633A1 (en) * | 2019-12-20 | 2021-06-24 | Entegris, Inc. | Accurate temperature reading of fluid near interface |
Families Citing this family (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2869392B1 (fr) * | 2004-04-27 | 2006-07-14 | Siemens Vdo Automotive Sas | Tete d'une bougie de prechauffage equipee d'un capteur de pression |
US7221440B2 (en) * | 2004-07-22 | 2007-05-22 | Eastman Kodak Company | System and method for controlling ink concentration using a refractometer |
US7317533B2 (en) * | 2005-01-14 | 2008-01-08 | Jetalon Solutions, Inc. | Metal ion concentration analysis for liquids |
US20060191571A1 (en) * | 2005-02-11 | 2006-08-31 | Kattler David R | Fluid concentration sensing arrangement |
FI118864B (fi) * | 2005-08-12 | 2008-04-15 | Janesko Oy | Refraktometri |
US7319523B2 (en) * | 2005-09-26 | 2008-01-15 | Jetalon Solutions, Inc. | Apparatus for a liquid chemical concentration analysis system |
US7445934B2 (en) * | 2006-04-10 | 2008-11-04 | Baker Hughes Incorporated | System and method for estimating filtrate contamination in formation fluid samples using refractive index |
US8602640B2 (en) * | 2009-05-20 | 2013-12-10 | Entegris—Jetalon Solutions, Inc. | Sensing system and method |
DE102015106805A1 (de) | 2015-04-30 | 2016-11-03 | Anton Paar Optotec Gmbh | Temperaturkalibration für Messgerät |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3487069A (en) * | 1965-05-11 | 1969-12-30 | Mario Maselli | Refractometer with compensating photocells |
EP0305109A1 (de) * | 1987-08-22 | 1989-03-01 | AMERSHAM INTERNATIONAL plc | Biologische Sensoren |
DE9015539U1 (de) * | 1990-11-09 | 1991-01-31 | Franz Schmidt & Haensch Gmbh & Co, 1000 Berlin | Refraktometer |
US6149591A (en) * | 1997-02-21 | 2000-11-21 | Duke University | Refractometric devices especially adapted for the in vivo detection of refractive indices of cervical mucus |
US20010035950A1 (en) * | 2000-04-17 | 2001-11-01 | Nicholas Paul H. | Electronic device for distinguishing sugar sweetened beverages from artificially sweetened ones |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5859696A (en) * | 1997-12-04 | 1999-01-12 | Nicholas; Paul | Refractometer for distinguishing sugar-sweetened beverages from artificially-sweetened ones |
DE10007818A1 (de) * | 2000-02-21 | 2001-08-23 | Mahrt Karl Heinz | Hochdruckfester kompakter Präzionsmeßkopf für hochgenaue optische Brechungsindexmessungen in ruhenden und strömenden Flüssigkeiten und Gasen, insbesondere geeignet für den massenhaften Einsatz in Einwegsonden für in situ-Untersuchungen in der Tiefsee |
-
2002
- 2002-01-21 DE DE10202117A patent/DE10202117C2/de not_active Expired - Fee Related
- 2002-12-19 WO PCT/EP2002/014586 patent/WO2003060492A1/de active IP Right Grant
- 2002-12-19 DE DE50207885T patent/DE50207885D1/de not_active Expired - Fee Related
- 2002-12-19 JP JP2003560538A patent/JP2005515433A/ja active Pending
- 2002-12-19 US US10/476,749 patent/US7064816B2/en not_active Expired - Fee Related
- 2002-12-19 BR BR0209264-6A patent/BR0209264A/pt not_active IP Right Cessation
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3487069A (en) * | 1965-05-11 | 1969-12-30 | Mario Maselli | Refractometer with compensating photocells |
EP0305109A1 (de) * | 1987-08-22 | 1989-03-01 | AMERSHAM INTERNATIONAL plc | Biologische Sensoren |
DE9015539U1 (de) * | 1990-11-09 | 1991-01-31 | Franz Schmidt & Haensch Gmbh & Co, 1000 Berlin | Refraktometer |
US6149591A (en) * | 1997-02-21 | 2000-11-21 | Duke University | Refractometric devices especially adapted for the in vivo detection of refractive indices of cervical mucus |
US20010035950A1 (en) * | 2000-04-17 | 2001-11-01 | Nicholas Paul H. | Electronic device for distinguishing sugar sweetened beverages from artificially sweetened ones |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2021126633A1 (en) * | 2019-12-20 | 2021-06-24 | Entegris, Inc. | Accurate temperature reading of fluid near interface |
US11788902B2 (en) | 2019-12-20 | 2023-10-17 | Entegris, Inc. | Accurate temperature reading of fluid near interface |
Also Published As
Publication number | Publication date |
---|---|
DE50207885D1 (de) | 2006-09-28 |
US20040125363A1 (en) | 2004-07-01 |
BR0209264A (pt) | 2005-01-04 |
DE10202117A1 (de) | 2003-08-07 |
US7064816B2 (en) | 2006-06-20 |
DE10202117C2 (de) | 2003-12-24 |
WO2003060492A8 (de) | 2003-11-27 |
JP2005515433A (ja) | 2005-05-26 |
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