DE102004018754B4 - Apparatus for measuring light scattering and light absorption of samples - Google Patents
Apparatus for measuring light scattering and light absorption of samples Download PDFInfo
- Publication number
- DE102004018754B4 DE102004018754B4 DE200410018754 DE102004018754A DE102004018754B4 DE 102004018754 B4 DE102004018754 B4 DE 102004018754B4 DE 200410018754 DE200410018754 DE 200410018754 DE 102004018754 A DE102004018754 A DE 102004018754A DE 102004018754 B4 DE102004018754 B4 DE 102004018754B4
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- lens
- radiation
- plane
- receiver
- sample
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- 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
- G01N21/47—Scattering, i.e. diffuse reflection
- G01N21/49—Scattering, i.e. diffuse reflection within a body or fluid
- G01N21/53—Scattering, i.e. diffuse reflection within a body or fluid within a flowing fluid, e.g. smoke
- G01N21/532—Scattering, i.e. diffuse reflection within a body or fluid within a flowing fluid, e.g. smoke with measurement of scattering and transmission
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- 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)
Abstract
Vorrichtung für die synchrone Messung der Lichtstreuung und Lichtabsorption von Proben (11), mit Strahlungsquellen (2) und Empfängern (5), die in einer gemeinsamen Strahlungsund Empfangsebene (1) angeordnet sind, diese Ebene ungefähr in der Brennebene einer Linse (3) lokalisiert ist, die Linse (3) aus der von der Strahlungs- und Empfangsebene (1) divergent abgestrahlten Strahlung (7) Parallelstrahlung (8) erzeugt, die die Probe (11) bis zu einem Spiegel (4) durchdringt und nach Reflexion am Spiegel (4) durch die Linse (3) auf einen Transmissionsempfänger (5) zur Messung der transmittierten Intensität (9) fokussiert wird, gekennzeichnet dadurch, dass für die Messung der Lichtstreuung (10) mindestens ein auf die Probe (11) ausgerichteter Empfänger (6) zwischen der Strahlungs- und Empfangsebene (1) und der Linse (3) in Nähe der Linse (3) angeordnet ist.Device for the synchronous measurement of light scattering and light absorption of samples (11), with radiation sources (2) and receivers (5), which are arranged in a common radiation and reception plane (1), this plane is located approximately in the focal plane of a lens (3) the lens (3) generates from the radiation (7) divergent radiation (7) from the radiation and reception plane (1) parallel radiation (8), which penetrates the sample (11) up to a mirror (4) and after reflection on the mirror ( 4) is focused by the lens (3) onto a transmission receiver (5) for measuring the transmitted intensity (9), characterized in that for measuring the light scattering (10) at least one receiver (6) aligned with the sample (11) is arranged between the radiation and reception plane (1) and the lens (3) in the vicinity of the lens (3).
Description
Die Erfindung betrifft eine Messsonde für die synchrone Messung der Lichtstreuung und Lichtabsorption.The invention relates to a measuring probe for the synchronous measurement of light scattering and light absorption.
Die Erfindung kann auf dem Gebiet der Analytik, Umwelt-, Qualitäts- und Prozeßüberwachung eingesetzt werden.The invention can be used in the field of analytics, environmental, quality and process monitoring.
In
Da die Strahlungs- und Empfangsebene ungefähr in der Brennebene der Linse lokalisiert ist, weisen die Empfänger einen Abstand zur Linse auf, der von der Brennweite der Linse vorgegeben ist. Insbesondere für die Streuungsmessung ist es dabei nachteilig, dass der Streuempfänger auch mit an optischen Grenzflächen (z. B. Luft/Linse im Innern der Messsonde) specular reflektierter Strahlung beaufschlagt wird. Diese Strahlung erhöht den optischen Offset und verringert dadurch den Dynamikbereich der Streuungsmessung. Außerdem sinkt durch die Wirkung des Entfernungsgesetzes (1/r2) die Intensität der von der Probe gestreuten und auf den Streuempfänger treffenden Strahlung. Ungünstige Signal/Rausch-Verhältnisse sind die Folge.Since the radiation and reception plane is located approximately in the focal plane of the lens, the receivers are spaced from the lens by the focal length of the lens. In particular for the scattering measurement, it is disadvantageous that the scattering receiver is also exposed to radiation specularly reflected at optical interfaces (eg air / lens inside the measuring probe). This radiation increases the optical offset and thereby reduces the dynamic range of the scattering measurement. In addition, the effect of the law of distance (1 / r 2 ) reduces the intensity of the radiation scattered by the sample and striking the scattering receiver. Unfavorable signal-to-noise ratios are the result.
Aufgabe der Erfindung ist daher die Entwicklung einer Messsonde zur synchronen Ermittlung der Lichtstreuung und Lichtabsorption, wobei insbesondere für die Streuungsmessung der Dynamikbereich und das Signal/Rausch-Verhältnis erhöht werden sollen.The object of the invention is therefore the development of a measuring probe for the synchronous determination of the light scattering and light absorption, wherein in particular for the scattering measurement the dynamic range and the signal-to-noise ratio should be increased.
Die Lösung der Aufgabe erfolgt mit der im Anspruch 1 angegebenen Vorrichtung.The object is achieved with the device specified in
Zur Erläuterung des Anspruches 1 dienen beispielhaft die
Von einer Strahlungsquelle (
Gemäß Anspruch 2 kann der Empfänger (
Eine günstige Ausbildung des Empfängers (
Nach Anspruch 4 ist ein Schutzfenster einmal vor der Linse (
Für optisch dichte Proben (z. B. undurchsichtige Festkörper, sehr trübe Flüssigkeiten) kann der Spiegel (
Claims (4)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE200410018754 DE102004018754B4 (en) | 2004-04-17 | 2004-04-17 | Apparatus for measuring light scattering and light absorption of samples |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE200410018754 DE102004018754B4 (en) | 2004-04-17 | 2004-04-17 | Apparatus for measuring light scattering and light absorption of samples |
Publications (2)
Publication Number | Publication Date |
---|---|
DE102004018754A1 DE102004018754A1 (en) | 2005-11-03 |
DE102004018754B4 true DE102004018754B4 (en) | 2012-10-18 |
Family
ID=35070564
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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DE200410018754 Expired - Fee Related DE102004018754B4 (en) | 2004-04-17 | 2004-04-17 | Apparatus for measuring light scattering and light absorption of samples |
Country Status (1)
Country | Link |
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DE (1) | DE102004018754B4 (en) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102008017433B4 (en) | 2008-04-03 | 2010-04-08 | Krohne Optosens Gmbh | Device for measuring the scattering and / or absorption and / or refraction of a sample |
CN105393106B (en) * | 2013-04-06 | 2020-02-21 | 罗姆有限责任公司 | Device for measuring scattering of a sample |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19920184A1 (en) * | 1999-05-03 | 2000-11-30 | Optosens Optische Spektroskopi | Simultaneous detection of diffuse, specular reflections from specimens involves coupling radiation from receiver plane into space between receiver, optical planes, using two receivers |
DE19934934C1 (en) * | 1999-05-03 | 2001-06-07 | Optosens Optische Spektroskopi | Diffuse and specular reflection measuring method has diffuse reflection component, spectral reflection component and transmission components received at detection planes of at least 2 optoelectronic detectors |
DE10002238A1 (en) * | 1999-05-03 | 2001-07-26 | Optosens Optische Spektroskopi | Detecting specular reflection of opaque samples, involves defining the number and type of optical state variables to be recorded depending on the composition of the sample |
-
2004
- 2004-04-17 DE DE200410018754 patent/DE102004018754B4/en not_active Expired - Fee Related
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19920184A1 (en) * | 1999-05-03 | 2000-11-30 | Optosens Optische Spektroskopi | Simultaneous detection of diffuse, specular reflections from specimens involves coupling radiation from receiver plane into space between receiver, optical planes, using two receivers |
DE19934934C1 (en) * | 1999-05-03 | 2001-06-07 | Optosens Optische Spektroskopi | Diffuse and specular reflection measuring method has diffuse reflection component, spectral reflection component and transmission components received at detection planes of at least 2 optoelectronic detectors |
DE10002238A1 (en) * | 1999-05-03 | 2001-07-26 | Optosens Optische Spektroskopi | Detecting specular reflection of opaque samples, involves defining the number and type of optical state variables to be recorded depending on the composition of the sample |
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Publication number | Publication date |
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DE102004018754A1 (en) | 2005-11-03 |
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Legal Events
Date | Code | Title | Description |
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R012 | Request for examination validly filed |
Effective date: 20110415 |
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R016 | Response to examination communication | ||
R018 | Grant decision by examination section/examining division | ||
R020 | Patent grant now final |
Effective date: 20130119 |
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R081 | Change of applicant/patentee |
Owner name: SINN, GERT, DR., DE Free format text: FORMER OWNER: OPTOSENS OPTISCHE SPEKTROSKOPIE UND SENSORTECHNIK GMBH, 12489 BERLIN, DE Effective date: 20131015 |
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R119 | Application deemed withdrawn, or ip right lapsed, due to non-payment of renewal fee | ||
R409 | Internal rectification of the legal status completed | ||
R409 | Internal rectification of the legal status completed | ||
R119 | Application deemed withdrawn, or ip right lapsed, due to non-payment of renewal fee |