DE19822652A1 - Optical particle counter system with coincidence recognition - Google Patents
Optical particle counter system with coincidence recognitionInfo
- Publication number
- DE19822652A1 DE19822652A1 DE1998122652 DE19822652A DE19822652A1 DE 19822652 A1 DE19822652 A1 DE 19822652A1 DE 1998122652 DE1998122652 DE 1998122652 DE 19822652 A DE19822652 A DE 19822652A DE 19822652 A1 DE19822652 A1 DE 19822652A1
- Authority
- DE
- Germany
- Prior art keywords
- pulse
- optical particle
- coincidence
- evaluation
- particle counting
- 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- Withdrawn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
- 239000002245 particle Substances 0.000 title claims abstract description 23
- 230000003287 optical effect Effects 0.000 title claims description 5
- 238000001514 detection method Methods 0.000 claims description 6
- 238000011156 evaluation Methods 0.000 claims description 4
- 238000005259 measurement Methods 0.000 claims description 3
- 230000015572 biosynthetic process Effects 0.000 claims 1
- 238000000034 method Methods 0.000 description 1
- 238000003908 quality control method Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N15/10—Investigating individual particles
- G01N15/14—Optical investigation techniques, e.g. flow cytometry
- G01N15/1456—Optical investigation techniques, e.g. flow cytometry without spatial resolution of the texture or inner structure of the particle, e.g. processing of pulse signals
- G01N15/1459—Optical investigation techniques, e.g. flow cytometry without spatial resolution of the texture or inner structure of the particle, e.g. processing of pulse signals the analysis being performed on a sample stream
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N15/10—Investigating individual particles
- G01N15/14—Optical investigation techniques, e.g. flow cytometry
- G01N15/1429—Signal processing
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06M—COUNTING MECHANISMS; COUNTING OF OBJECTS NOT OTHERWISE PROVIDED FOR
- G06M11/00—Counting of objects distributed at random, e.g. on a surface
- G06M11/02—Counting of objects distributed at random, e.g. on a surface using an electron beam scanning a surface line by line, e.g. of blood cells on a substrate
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N15/10—Investigating individual particles
- G01N15/14—Optical investigation techniques, e.g. flow cytometry
- G01N2015/1493—Particle size
Landscapes
- Chemical & Material Sciences (AREA)
- General Physics & Mathematics (AREA)
- Physics & Mathematics (AREA)
- Biochemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Analytical Chemistry (AREA)
- Health & Medical Sciences (AREA)
- General Health & Medical Sciences (AREA)
- Dispersion Chemistry (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Engineering & Computer Science (AREA)
- Theoretical Computer Science (AREA)
- Signal Processing (AREA)
- Investigating Or Analysing Biological Materials (AREA)
Abstract
Description
Optische Einzelteilchenzähler werden für die Zahl- und Größenbestimmung von Partikeln eingesetzt. Die zu prüfenden Partikel (Fig. 1.1 u. 1.2) werden durch eine beleuchtete Meßzelle (Fig. 1.5 u. 1.6) geführt. Jedes Teilchen verursacht eine Änderung der Lichtmenge. Die aus diesem Vorgang resultierenden elektrischen Spannungspulse (Fig. 2, H) sind proportional zum Durchmesser des den Lichtstrahl passierenden Partikels und werden für die Größenbestimmung verwendet. Bei zufälliger räumlicher Verteilung der Partikel in der Strömung gibt es abhängig von der Partikelkonzentration immer eine endliche Wahrscheinlichkeit dafür, daß sich mehrere Partikel gleichzeitig im Meßvolumen befinden (Fig. 1; 1). Je höher die Anzahlkonzentration ist, um so größer wird der Anteil solcher Koinzidenzen. Koinzidenzen führen zu Fehlern bei der Größen- und Anzahlbestimmung. Bei der Aufzeichnung von Verteilungskurven findet eine Verschiebung in den Grobbereich statt. Die Amplitude von zwei kleinen Partikeln (Fig. 2; 1) läßt sich von der Amplitude eines größeren Partikels (Fig. 2; 2) nicht unterscheiden. Mit Hilfe des Koinzidenzerkennungssystems in der Auswerteeinheit (Fig. 1.3) kann der Spannungsimpuls (Fig. 2 ; 1) wie folgt als Fehler erkannt werden. Die Pulshöhe H wird bei der Messung erfaßt. Der Pulshöhe H wird ein Zeitfenster P2L-T2 bis P2L + T2 aus der Kalibriertabelle bzw. der Kalibrierkennlinie zugeordnet. Der Puls (Fig. 2; 1), erzeugt durch die Koinzidenz zweier Partikel (Fig. 1 ;1), fällt deutlich aus dem vorgegebenen Zeitfenster. Optical single particle counters are used to determine the number and size of particles. The particles to be tested ( Fig. 1.1 and 1.2) are passed through an illuminated measuring cell ( Fig. 1.5 and 1.6). Each particle causes a change in the amount of light. The electrical voltage pulses resulting from this process ( FIG. 2, H) are proportional to the diameter of the particle passing through the light beam and are used for the size determination. If the particles are randomly distributed in the flow, there is always a finite probability, depending on the particle concentration, that there are several particles in the measurement volume at the same time ( Fig. 1; 1). The higher the number concentration, the greater the proportion of such coincidences. Coincidences lead to errors in size and number determination. When recording distribution curves, there is a shift to the rough range. The amplitude of two small particles ( Fig. 2; 1) cannot be distinguished from the amplitude of a larger particle ( Fig. 2; 2). With the help of the coincidence detection system in the evaluation unit ( Fig. 1.3), the voltage pulse ( Fig. 2; 1) can be recognized as an error as follows. The pulse height H is recorded during the measurement. A time window P 2L -T 2 to P 2L + T 2 from the calibration table or the calibration characteristic curve is assigned to the pulse height H. The pulse ( Fig. 2; 1), generated by the coincidence of two particles ( Fig. 1; 1), clearly falls outside the specified time window.
Beim Einsatz von Einzelteilchenzählern in der Korngrößenbestimmung werden dem Anwender durch das Auftreten von Koinzidenzen große Partikel vorgetäuscht (siehe Fig. 1.1 u. 2.1). Eine Qualitätskontrolle durch den Partikelzähler ist dadurch in vielen Anwendungen nicht mehr möglich.When using single particle counters in the grain size determination, the user is faked by the occurrence of coincidences large particles (see Fig. 1.1 and 2.1). Quality control by the particle counter is no longer possible in many applications.
Durch die Erkennung und Auswertung von Koinzidenzen ist es möglich Koinzidenzen zu erfassen und entsprechend zu bewerten. Beim Einsatz des Erkennungssystems kann man außerdem größere Produktmengen/Zeiteinheit vermessen und kostengünstigere Zuführsysteme einsetzen.It is possible by recognizing and evaluating coincidences Record coincidences and evaluate them accordingly. When using the Detection system can also larger product quantities / unit of time measured and use cheaper feeding systems.
Claims (3)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE1998122652 DE19822652A1 (en) | 1998-05-20 | 1998-05-20 | Optical particle counter system with coincidence recognition |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE1998122652 DE19822652A1 (en) | 1998-05-20 | 1998-05-20 | Optical particle counter system with coincidence recognition |
Publications (1)
Publication Number | Publication Date |
---|---|
DE19822652A1 true DE19822652A1 (en) | 1999-11-25 |
Family
ID=7868421
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE1998122652 Withdrawn DE19822652A1 (en) | 1998-05-20 | 1998-05-20 | Optical particle counter system with coincidence recognition |
Country Status (1)
Country | Link |
---|---|
DE (1) | DE19822652A1 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102006021487B3 (en) * | 2006-05-05 | 2007-09-06 | Parsum Gmbh | Particle amount determination method for use in particle stream, involves using evaluation unit that provides pulses for control signals used in regulating flow rate and particle size of particles stream by reducing radiation intensity |
WO2013186078A1 (en) * | 2012-06-11 | 2013-12-19 | Siemens Aktiengesellschaft | Light-based particle detection with mass determination |
-
1998
- 1998-05-20 DE DE1998122652 patent/DE19822652A1/en not_active Withdrawn
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102006021487B3 (en) * | 2006-05-05 | 2007-09-06 | Parsum Gmbh | Particle amount determination method for use in particle stream, involves using evaluation unit that provides pulses for control signals used in regulating flow rate and particle size of particles stream by reducing radiation intensity |
US8345236B2 (en) | 2006-05-05 | 2013-01-01 | Parsum Gmbh | Method and apparatus for determining the particles contained in a particle stream |
WO2013186078A1 (en) * | 2012-06-11 | 2013-12-19 | Siemens Aktiengesellschaft | Light-based particle detection with mass determination |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
8110 | Request for examination paragraph 44 | ||
8125 | Change of the main classification |
Ipc: G01N 1502 |
|
8139 | Disposal/non-payment of the annual fee |