WO2001063252A1 - Hochdruckfester kompakter präzisionsmesskopf für optische brechungsindexmessungen in flüssigkeiten - Google Patents
Hochdruckfester kompakter präzisionsmesskopf für optische brechungsindexmessungen in flüssigkeiten Download PDFInfo
- Publication number
- WO2001063252A1 WO2001063252A1 PCT/EP2001/001338 EP0101338W WO0163252A1 WO 2001063252 A1 WO2001063252 A1 WO 2001063252A1 EP 0101338 W EP0101338 W EP 0101338W WO 0163252 A1 WO0163252 A1 WO 0163252A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- measuring
- refractive index
- pressure
- measuring head
- reference body
- Prior art date
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
- G01N21/17—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
-
- 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
- G01N21/0317—High pressure cuvettes
Definitions
- ⁇ se p r has been widely used for a long time.
- Refractometers in which, in different versions, the versions .nk ⁇ l of the ones broken during the transition from ⁇ : r : ⁇ ec ⁇ um to a reference medium to the plumb line Light beam is determined quantitatively.
- the basis of these measuring instruments is Snellius' see 3recognition law.
- the achievable measuring accuracy for the refractive index of the medium to be examined is crucially dependent, inter alia, on the accuracy of the refractive index of the reference body, on the accuracy of the angles .alpha. And .beta.
- the incident and the refracted light beam and on the properties of the light source and the detector for measuring the EmDfan ⁇ s beam.
- the absolute values of the angles, the dimensions and the refractive index of the reference body do not necessarily have to be known very precisely, since the refractometer can be calibrated with the help of one or more liquids and / or gases that are precisely known with regard to their refractive index.
- Refractometers of particularly high accuracy for in situ measurements in the laboratory, but also in the laboratory, are of considerable importance for the determination of the physical size of the state of the sea water, especially in the vastly extensive areas of the deep sea.
- efforts have been made to implement instruments suitable for enemy use; the stability and accuracy achieved so far has been rather unsatisfactory.
- the underlying refractometer principle is described in brief. For this purpose, consider Figure 1. At first glance, the external dimensions of the instrument, such as length and diameter, are comparable to the well-known, classic Abbe immersion refractometer.
- the stab-shaped measuring device carries at one end the sensor measuring head A immersed in the liquid to be examined (or the gas) and the housing part C. containing the optical bench, light source and sensor electronics. Measuring head and
- the device can be completely immersed in the medium.
- the necessary supply and signal connections from the sensor interior to the outside and vice versa can e.g. via high pressure resistant plugs or cable bushings or also e.g. Via magnetic or optical transmission paths through the housing wall, provided that the housing material has no magnetic or optical disadvantages.
- High pressure-resistant glass or ceramic housings are an example.
- FIG. 1 shows the functional principle of the refractometer shown in schematic blocks
- FIG. 2 shows the beam path with respect to the refractive index reference prism, where ⁇ is the prism angle between the plane of light entry at the limit between the measuring medium and the reference prism and the level of the support of the prism on the high pressure bulkhead bushing.
- FIG. 3 illustrates how, for example, in order to improve the hydrodynamic rinsing of the measuring area of the sensor, the points of the reference prism which are not required can be removed by grinding without influencing the active measuring surfaces and without endangering the pressure resistance.
- Well-defined light emanating from the light source 1 is divided in a fiber optic coupler 2, for example.
- Part of the light is guided via an optical waveguide through the high-pressure bulkhead bushing B into the collimator 3 and bundled there to form a thin thread beam. oh through running the measuring medium he meets the refractive index prism 4 at the angle of incidence ⁇ , is broken to the plumb line at the angle ⁇ , then passes through the high-pressure bulkhead bushing into the pressure-protected housing interior and arrives at the photoelectric receiver 5, which is extremely precise at the angle of refraction allowed to determine.
- the fracture index of the medium to be examined can be electronically electronically calculated from them at the moment. up to about 10 " 'after the coefficients of the conversion algorithm have been determined in a previous calibration process.
- the thermometer 8 which is mounted on the measuring head and provides the calibrated measuring voltage U j for subsequent data processing, is provided on the reference prism determined.
- S ingle block sensor head can be seen in principle in Figure 4:
- the view shows a main section through the two firmly connected and high pressure-sealed parts reference prism body 1 and high pressure bulkhead lead-through part 2.
- the from the high pressure protected interior of the instrument through a hole in the bulkhead leadthrough incoming collimated filament beam (of, for example, 0.5 mm diameter) is reflected on the reflecting surface 3 in such a way that it emerges vertically from the surface 4 into the measuring medium in order to meet the entry surface 5 after a short distance, where it enters the reference ⁇ prisrna is broken into Lot 5.
- the beam is then reflected back into the interior of the instrument through the corresponding bore in the high-pressure bulkhead bushing, in order to finally reach the detector measuring the angle of refraction.
- surfaces 3 and 7 with mirror coverings or, if necessary, to achieve reflection without realizing the condition of total reflection on the corresponding surfaces.
- the part of the sensor head which consists of a single glass body material and which may still have, for example, gold-coated mirror coverings at the mentioned ootically effective points, can be produced completely automatically by machine by sawing, grinding, polishing and, if necessary, mirror coating, after having selected the suitable one optical glass material, the determination of the measuring range, as it results from the liquids or gases to be measured, all angles, areas, dimensions have been predetermined by calculation.
- the shading-free inclined position of these two surfaces shown here is selected and, at the same time, free grinding is carried out, as much as possible Clear away the material of the prism in such a way that optimum flow behavior and the fastest possible flushing in the area of the measuring volume are achieved without adversely affecting the required mechanical stability of the measuring head and without disturbing the measuring beam inside the vitreous body or in the area of the measuring volume of the medium to be examined.
- FIG. 5 shows the reference prism of the sensor head worked out from a circular cylinder with the ground-in fastening groove a, which divides the prism into the upper cylinder area b and the lower cylinder area c.
- the latter is used for problem-free O-ring high-pressure sealing of the glass body on the high-pressure bulkhead lead-through part 2 of FIG. 4, which is described below.
- the upper cylinder part b can be used as a sealing surface for a protective cap placed on the sensor or for a capsule-like container with preservation and / or calibration fluid.
- FIG. 6 is a side view of the prism in FIG. 5 seen rotated through 90 ° from the left, while FIG. 7 shows a view vertically from above.
- FIG. 6 e.g. outlines how hydrodynamically disturbing points are ground away, with an optimum between more aerodynamic
- Shape and mechanical stability can be achieved.
- the particularly critical area d in Figure 5 must be controlled very precisely, e.g. at the point where the thread jet enters the measuring medium, e.g. be carried out with a narrow saw blade as a simple groove incision in order to then shape the less critical slope surfaces around the elliptical area of the optically used refractive surface in a simple manner in a flow-favorable manner (see FIG. 8).
- FIGS. 8 and 9 are spatial sketches of the upper part b of FIG. 5 for better illustration of the flow-optimized shape of the "single block” sensor head.
- FIG. 9 shows in particular the beam path and the areas Au that are possibly mirrored with gold.
- the refractive index reference body is provided with a polished flat surface which, as a high-pressure-resistant support, lies flat and immovably on the flat surface f of the high-pressure bulkhead bushing according to FIG.
- Holding down spring clips g press "the glass body in the direction of the instrument axis.
- a suction-fitting centering ring h secures against radial displacement.
- the collar ring i is, for example, firmly connected to the main body 1 of the high-pressure bulkhead bushing and has O-ring seals k and j, which are resistant to
- the entire unit of the high-pressure-resistant, compact precision measuring head for high-precision optical refractive index measurements in still and flowing liquids and gases is finally shown in Figure 11.
- An embodiment was produced to scale according to Figure 11 with a vitreous cylinder diameter of 27 mm and high pressure resistance have been demonstrated.
- the space between the surfaces 4 and 5 in Figure 4 can be designed differently.
- a constant measuring volume is given with a constant elliptical cross section of the entry beam through the surface 5 into the measuring prism.
- the angle between surfaces 4 and 5 is less than 90 °.
- the homogeneous glass prism can be machined from a single blank, or it can also be composed of several sections, which can then be e.g. ciffusion-welded, so that the optical and mechanical homogeneity is completely guaranteed.
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- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Investigating Or Analysing Materials By Optical Means (AREA)
- Measurement Of Levels Of Liquids Or Fluent Solid Materials (AREA)
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10/204,890 US7030976B2 (en) | 2000-02-21 | 2001-02-08 | Compact precision measuring head, which is resistant to high-pressure, for measuring the optical refractive index in liquids |
AU2001231711A AU2001231711A1 (en) | 2000-02-21 | 2001-02-08 | Compact precision measuring head, which is resistant to high-pressure, for measuring the optical refractive index in liquids |
EP01903717A EP1257808A1 (de) | 2000-02-21 | 2001-02-08 | Hochdruckfester kompakter präzisionsmesskopf für optische brechungsindexmessungen in flüssigkeiten |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10007818.4 | 2000-02-21 | ||
DE10007818A DE10007818A1 (de) | 2000-02-21 | 2000-02-21 | 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 |
Publications (2)
Publication Number | Publication Date |
---|---|
WO2001063252A1 true WO2001063252A1 (de) | 2001-08-30 |
WO2001063252B1 WO2001063252B1 (de) | 2002-02-14 |
Family
ID=7631689
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP2001/001338 WO2001063252A1 (de) | 2000-02-21 | 2001-02-08 | Hochdruckfester kompakter präzisionsmesskopf für optische brechungsindexmessungen in flüssigkeiten |
Country Status (5)
Country | Link |
---|---|
US (1) | US7030976B2 (de) |
EP (1) | EP1257808A1 (de) |
AU (1) | AU2001231711A1 (de) |
DE (1) | DE10007818A1 (de) |
WO (1) | WO2001063252A1 (de) |
Families Citing this family (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10202117C2 (de) * | 2002-01-21 | 2003-12-24 | Testo Gmbh & Co | Refraktometer |
US7382458B2 (en) * | 2004-04-01 | 2008-06-03 | Custom Sample Systems, Inc. | Fiber optic fluid probe |
FI118864B (fi) | 2005-08-12 | 2008-04-15 | Janesko Oy | Refraktometri |
US8184276B2 (en) * | 2008-12-08 | 2012-05-22 | Carl Embry | Continuous index of refraction compensation method for measurements in a medium |
DE102015106795A1 (de) * | 2015-04-30 | 2016-11-03 | Anton Paar Optotec Gmbh | Wellenlängenkalibration für Refraktometer |
CN109540375A (zh) * | 2018-12-20 | 2019-03-29 | 安徽天康(集团)股份有限公司 | 一种防腐防爆型压力表 |
FI20215647A1 (en) * | 2020-07-31 | 2022-02-01 | Kaahre Jan | Optical multimeter |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3917411A (en) * | 1972-09-26 | 1975-11-04 | Vdo Schindling | Apparatus for measuring the density of a liquid utilizing refraction |
US3932038A (en) * | 1973-07-04 | 1976-01-13 | Vdo Adolf Schindling Ag | Apparatus for the continuous measurement of the density of a liquid by utilization of the law of refraction |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3917441A (en) | 1974-05-23 | 1975-11-04 | Roy M Gray | Hanging candle structure |
EP0206433B1 (de) * | 1985-06-25 | 1993-05-05 | The Dow Chemical Company | Verfahren zur Messung des Lichtabsorptionsvermögens eines Flüssigkeitsmediums |
FI96451C (fi) * | 1993-09-07 | 1996-06-25 | Janesko Oy | Refraktometri |
US5381022A (en) * | 1993-12-10 | 1995-01-10 | Imo Industries, Inc. | Combined optical waveguide and prismatic liquid-level sensor |
GB9415962D0 (en) * | 1994-08-06 | 1994-09-28 | Schlumberger Ltd | Multiphase fluid component discrimination |
US5991029A (en) * | 1998-04-06 | 1999-11-23 | Axiom Analytical, Inc. | Attenuated total reflecance probe employing large incidence angles |
-
2000
- 2000-02-21 DE DE10007818A patent/DE10007818A1/de not_active Withdrawn
-
2001
- 2001-02-08 EP EP01903717A patent/EP1257808A1/de not_active Withdrawn
- 2001-02-08 US US10/204,890 patent/US7030976B2/en not_active Expired - Fee Related
- 2001-02-08 WO PCT/EP2001/001338 patent/WO2001063252A1/de not_active Application Discontinuation
- 2001-02-08 AU AU2001231711A patent/AU2001231711A1/en not_active Abandoned
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3917411A (en) * | 1972-09-26 | 1975-11-04 | Vdo Schindling | Apparatus for measuring the density of a liquid utilizing refraction |
US3932038A (en) * | 1973-07-04 | 1976-01-13 | Vdo Adolf Schindling Ag | Apparatus for the continuous measurement of the density of a liquid by utilization of the law of refraction |
Non-Patent Citations (3)
Title |
---|
MAHRT K.-H. AND HOSSEINIOUN A.: "Expendable high precision micro optical sensors to be used in automated concerted profilings for large ara density contouring of the deep sea.", CONF. PROCS. OCEANS '99, PUBL. NO. 99CH37008, vol. 3, September 1999 (1999-09-01), Seattle, WA, USA, pages 1218 - 1222, XP002171624 * |
MAHRT K.-H. AND HOSSEINIOUN A.: "Expendable optical density profilers started from intelligent multiple shot launcher on the deep sea bottom with storage capabilities over several years", CONF. PROCS. OCEANS 2000, PUBL. NO. 00CH37158, vol. 2, September 2000 (2000-09-01), Piscataway, NJ, USA, pages 791 - 796, XP002171623 * |
MAHRT K.-H. AND WALDMANN C.: "Field proven high speed micro optical density porfiler sampling 1000 times per second with 10-6 precision.", CONF. PROCS. OCEANS '88 PUBL. NO. 88CH2585, vol. 2(4), 1988, Baltimore, MD, USA, pages 497 - 504, XP002171625 * |
Also Published As
Publication number | Publication date |
---|---|
AU2001231711A1 (en) | 2001-09-03 |
US7030976B2 (en) | 2006-04-18 |
WO2001063252B1 (de) | 2002-02-14 |
US20040145730A1 (en) | 2004-07-29 |
EP1257808A1 (de) | 2002-11-20 |
DE10007818A1 (de) | 2001-08-23 |
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