WO2006067977A1 - 粒子計数器 - Google Patents
粒子計数器 Download PDFInfo
- Publication number
- WO2006067977A1 WO2006067977A1 PCT/JP2005/022637 JP2005022637W WO2006067977A1 WO 2006067977 A1 WO2006067977 A1 WO 2006067977A1 JP 2005022637 W JP2005022637 W JP 2005022637W WO 2006067977 A1 WO2006067977 A1 WO 2006067977A1
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- WIPO (PCT)
- Prior art keywords
- false
- count
- particle counter
- frequency
- particle
- Prior art date
Links
- 239000002245 particle Substances 0.000 title claims abstract description 96
- 238000005259 measurement Methods 0.000 claims abstract description 23
- 238000001514 detection method Methods 0.000 claims description 8
- 230000014509 gene expression Effects 0.000 claims description 8
- 238000000034 method Methods 0.000 description 26
- 238000004364 calculation method Methods 0.000 description 10
- 238000004519 manufacturing process Methods 0.000 description 7
- 238000006243 chemical reaction Methods 0.000 description 6
- 238000010586 diagram Methods 0.000 description 6
- 238000004458 analytical method Methods 0.000 description 5
- 238000000149 argon plasma sintering Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 102100031798 Protein eva-1 homolog A Human genes 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- JJWKPURADFRFRB-UHFFFAOYSA-N carbonyl sulfide Chemical compound O=C=S JJWKPURADFRFRB-UHFFFAOYSA-N 0.000 description 1
- 230000001678 irradiating effect Effects 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
- 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
- G01N2015/1486—Counting the particles
Definitions
- the present invention relates to a particle counter that measures the number of suspended particles contained in a sample and determines the concentration of particles in the sample.
- a particle counter there is a so-called pseudo-count that is displayed as a count value even though there is no particle having a measurable size in a sample.
- Possible causes of false counts include noise generated by laser light sources, noise generated by photoelectric converters, noise resulting from random voltage fluctuations in each circuit, and cosmic rays entering from the outside.
- the laser diode is driven by a laser drive circuit that outputs a drive current in which a high-frequency component is superimposed on a direct current, and the longitudinal mode of the laser diode is changed to a multimode.
- a laser drive circuit that outputs a drive current in which a high-frequency component is superimposed on a direct current, and the longitudinal mode of the laser diode is changed to a multimode.
- Patent Document 1 Japanese Patent Laid-Open No. 9178645
- the present invention has been made in view of the above-described problems of the prior art, and the object of the present invention is to effectively perform false counting caused by various causes with a relatively simple configuration. It is an object of the present invention to provide a particle counter that can be reduced automatically.
- the invention according to claim 1 is a particle counter that determines the concentration of particles in a sample by measuring the number of suspended particles contained in the sample. And the frequency of occurrence of the false count stored in the storage unit! It is equipped with a subtraction processing unit that subtracts the count value force after the start of measurement from the value based on the degree.
- the particle detector in the particle counter that determines the particle concentration in the sample by measuring the number of suspended particles contained in the sample, the particle detector outputs when no particles are present.
- a storage unit that stores a relational expression between the DC level and the frequency of occurrence of false counts, and the direct current level output by the particle detection unit at the start of measurement with reference to the relational expression stored in the storage unit.
- a subtraction processing unit is provided for determining the occurrence frequency of the corresponding false count and subtracting the value based on the occurrence frequency of the false count from the count value force after the start of measurement.
- the invention according to claim 3 is the particle counter according to claim 1 or 2, wherein the subtraction processing unit subtracts the reciprocal (lZm) of the obtained occurrence frequency (m) of the false count.
- the number to be subtracted is carried over to the next time interval, so the count value is If the signal to increase is not generated, the subtraction process is not performed, so that the already displayed count value does not subtract.
- FIG. 1 is a configuration diagram of a first embodiment of a particle counter according to the present invention.
- FIG. 2 is a flowchart showing the operation of the first embodiment of the particle counter according to the present invention.
- FIG. 3 is a configuration diagram of the second embodiment of the particle counter according to the present invention.
- FIG. 6 is a flowchart showing the operation of the second embodiment of the particle counter according to the present invention.
- FIG. 7 is a flowchart showing a procedure of subtraction processing in a time interval with a measurement time.
- FIG. 1 is a configuration diagram of the first embodiment of the particle counter according to the present invention
- FIG. 2 is a flow chart showing the same operation
- FIG. 3 is a second embodiment of the particle counter according to the present invention.
- Fig. 4 shows the output voltage waveform diagram of the photoelectric converter
- Fig. 5 shows the relationship between the DC level of the photoelectric converter and the frequency of false counting
- Fig. 6 shows the operation of the second embodiment.
- FIG. 7 is a flowchart showing the procedure of the subtraction process in a time interval with a measurement time.
- a particle detection unit 1 that detects light in a sample using light, and captures particles for each particle size category. It consists of a pulse height analysis unit 2, a calculation unit 3 that performs calculation processing considering false counts, and a display / output unit 4 that displays the processing result of the calculation unit 3 as it is or outputs it as an electrical signal.
- the particle detection unit 1 includes a flow channel 6 through which a sample flows, a light source 7 that forms a particle detection region by irradiating the flow channel 6 with laser light La, and scattered light emitted by particles that pass through the particle detection region.
- a condensing lens 8 that condenses Ls and a photoelectric conversion 9 that converts light collected by the condensing lens 8 into a voltage corresponding to the intensity of the light are provided.
- the wave height analysis unit 2 receives the output signal of the particle detection unit 1 and outputs a signal of a predetermined level or more as particles having a particle size corresponding to the level according to the particle size classification.
- the DC level is removed from the output signal of the photoelectric converter 9 input to the pulse height analyzer 2.
- the DC level output by the photoelectric conversion 9 refers to a voltage corresponding to the amount of background light incident on the photoelectric converter 9 when there is no scattered light Ls due to particles.
- the calculation unit 3 receives the output signal from the pulse height analysis unit 2, and stores a counter unit 10 that counts pulses corresponding to the particle size classification, and stores the occurrence frequency of false counts at the time of shipment or manufacture. Subtraction processing that performs calculation processing that does not increase the count value of the crest value corresponding to the minimum particle size by the occurrence frequency of false counts among the count numbers output by the memory unit 11 and the counter unit 10. Part 12 etc. are provided.
- step SP1 the subtraction processing unit 12 obtains and stores in advance, and the occurrence frequency m0 of the false count at the time of shipment or manufacturing is calculated from the storage unit 11.
- step SP2 a subtraction process is performed by dividing the measurement time into time segments of the reciprocal lZmO of the false count occurrence frequency mO. This means that “1” is subtracted every time lZmO from the count value of the minimum particle size output by the counter unit 10. However, in the first time interval (0 ⁇ : LZ2mO), the subtraction process is not performed and the count value of the counter unit 10 is output as it is to the display / output unit 4 as the measurement result.
- the counter unit 10 when a signal for increasing the count value is input to the counter unit 10, the counter unit 10 counts the signal. However, in the subtraction processing unit 12, if it is a force value corresponding to the minimum particle size, the processing equivalent to that of subtraction is achieved by performing processing that does not increase the count value by the number to be subtracted. Bring.
- the particle counter is used under conditions almost equal to the use conditions at the time of shipment or manufacture, it is based on the occurrence frequency mO of the false count obtained under the use conditions at the time of shipment or manufacture. By performing the subtraction process, a more accurate count value can be obtained.
- the second embodiment of the particle counter according to the present invention includes a particle detector 1 for detecting particles in a sample using light, and particle size classification. It consists of a pulse height analysis unit 2 that is captured every time, a calculation unit 13 that performs calculation processing in consideration of false counts, and a display / output unit 4 that displays the processing results of the calculation unit 13 or outputs them as electrical signals.
- the calculation unit 13 receives the output signal from the wave height analysis unit 2 and counts the pulse corresponding to the particle size classification, and the photoelectric conversion 9 when no particles exist at the time of shipment or manufacture.
- a subtraction processing unit 22 that performs arithmetic processing so as not to increase the count value of the crest value corresponding to the minimum particle size by the occurrence frequency of false counts among the count numbers output by the counter unit 10 .
- the DC level output from the photoelectric conversion 9 is also input to the subtraction processing unit 22. Note that components having the same reference numerals as those in the first embodiment shown in FIG.
- the present invention can also be applied to the light shielding type particle counter.
- the DC level N1 due to the background light always appears, and the laser beam La Noise and photoelectric converter 9 noise are superimposed.
- the pulse P1 appears on the plus side, protruding from the DC level N1. If the peak value corresponding to the minimum peak particle size of noise superimposed on the DC level N1 corresponds to the peak value, for example, the pulse F1 is counted as a false count.
- the DC level N2 due to the light irradiated by the light source always appears,
- the direct current level N2 is superimposed with noise of light source light, noise of the photoelectric converter 9, and the like. If a particle larger than the minimum particle size appears, a pulse P2 appears on the minus side, protruding from the DC level N2. Then, the positive peak value of noise superimposed on DC level N2, for example, pulse F2, is not counted, but the negative peak value of noise superimposed on DC level N2 is the wave corresponding to the minimum particle size. In the case of a high value, for example, pulse F3 is counted as a false count.
- the phenomenon that is the object of false counting appears as a relatively small peak that roughly corresponds to the minimum particle size. Therefore, the subtraction process targets the crest value corresponding to the minimum particle size for the particle counter. Therefore, even if a peak value corresponding to a particle size larger than the minimum particle size is detected, it is not counted as a false count and is not subject to subtraction processing.
- the particle counter In order to determine the frequency of occurrence of false counts, the particle counter is operated for 24 hours, for example, in a state where the particle counter does not detect particles under the usage conditions at the time of shipment or manufacture, and in this state the minimum particle size is reduced. The count value of the corresponding peak value is obtained. Then, when the count value of the crest value corresponding to the minimum particle size is divided by the operation time, the occurrence frequency per time is obtained. Photoelectric converter at this time
- the DC level DO of 9 and the occurrence frequency m0 of the false count are parameters.
- the unit of occurrence frequency mO is [for Z pieces] for convenience of explanation.
- the occurrence frequency m of the false count depends on the DC level D of the photoelectric converter 9.
- the level of the scattered light Ls emitted by the particles in the DC level D and the particle detection region is proportional to the intensity of the laser light La.
- the intensity of the laser beam La is halved, the direct current level D of the photoelectric conversion 9 and the level of the scattered light Ls emitted by the particles are also halved.
- the level of noise etc. due to photoelectric change 9 does not change. Therefore, when the intensity of the laser beam La is lowered, that is, when the direct current level D of the photoelectric converter 9 is lowered, noise or the like due to the photoelectric converter 9 becomes relatively conspicuous. In other words, when the DC level D is low, the occurrence frequency m of false counts is high.
- These parameters a, mO, and DO are stored in the storage unit 11.
- These parameters a, mO, and DO are read out at the start of measurement and used for the subtraction processing by the subtraction processing unit 12.
- step SP11 when measurement is started, in step SP11, a slope a representing the relationship between the occurrence frequency m of the false count previously obtained and stored by the subtraction processing unit 22 and the DC level D of the photoelectric converter 9a And the frequency of occurrence of false counting mO and the DC level DO of the photoelectric converter 9 at that time DO Is read from the storage unit 21.
- step SP12 the DC level D1 of the photoelectric converter 9 at the start of measurement is measured.
- step SP13 the parameters a, m0, DO read from the storage unit 21 are used to Calculate the false occurrence frequency ml corresponding to the DC level D1.
- step SP14 a subtraction process is performed by dividing the measurement time into time zones of the reciprocal 1Z ml of the occurrence frequency ml of false counts. This means that “1” is subtracted every time lZml from the count value of the minimum particle diameter output by the counter unit 10. However, in the first time interval (0 to lZ2ml), the subtraction process is not performed and the count value of the counter unit 10 is output to the display / output unit 4 as the measurement result.
- the counter unit 10 counts the signal.
- the subtraction processing unit 22 is a force count value corresponding to the minimum particle size, the subtraction processing unit 22 does not increase the count value by the number to be subtracted, resulting in the same effect as subtraction. Bring.
- the DC level D 0 of the photoelectric converter 9 and the false count occurrence frequency mO are obtained under the use conditions at the time of shipment or manufacture, and the false count occurrence frequency m and the direct current of the photoelectric converter 9 are further determined.
- the DC level D of photoelectric change 9 is changed in several ways, the slope a is obtained, and the DC level D force of photoelectric change 9 even under different use conditions Frequency of occurrence of false counts By calculating m and performing a subtraction process, a more accurate count value is obtained.
- step SP21 the carry-over number of the number to be subtracted from the previous time interval is added to obtain the number to be subtracted in the time interval.
- step SP22 the subtraction process The logical units 12 and 22 determine whether or not a signal for increasing the count value is generated. If a signal to increase the count value is generated, the process proceeds to step SP23. If a signal to increase the count value is not generated, the process proceeds to step SP26.
- step SP23 it is determined whether or not the number to be subtracted in the time interval has been subtracted. If the number to be subtracted is not subtracted in the time interval, the process proceeds to step SP24, and the signal for increasing the generated count value is not counted. On the other hand, if the number to be subtracted has already been subtracted in the time interval, a signal for increasing the number of counts generated normally in step SP25 is counted.
- step SP26 it is determined whether or not the force that has ended the time interval, that is, whether or not the time 1Z ml has elapsed. If time lZml has elapsed, the process proceeds to step SP27, and if time lZml has not elapsed, the process returns to step SP22.
- step SP27 it is determined whether or not the number to be subtracted in the time interval has been used up. If the number to be subtracted in the time interval is used up, the subtraction process in the time interval ends. On the other hand, if the number to be subtracted has not been used up in the time interval, the processing for carrying over the number to be subtracted to the next time interval is performed in step SP28, and then the subtraction processing in the time interval is completed.
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Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US11/793,883 US7755760B2 (en) | 2004-12-21 | 2005-12-09 | Particle counter for measuring floating particles which can effectively reduce false counts |
CN2005800485181A CN101124471B (zh) | 2004-12-21 | 2005-12-09 | 粒子计数器 |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2004368658A JP3995684B2 (ja) | 2004-12-21 | 2004-12-21 | 粒子計数器 |
JP2004-368658 | 2004-12-21 |
Publications (1)
Publication Number | Publication Date |
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WO2006067977A1 true WO2006067977A1 (ja) | 2006-06-29 |
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Application Number | Title | Priority Date | Filing Date |
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PCT/JP2005/022637 WO2006067977A1 (ja) | 2004-12-21 | 2005-12-09 | 粒子計数器 |
Country Status (4)
Country | Link |
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US (1) | US7755760B2 (ja) |
JP (1) | JP3995684B2 (ja) |
CN (1) | CN101124471B (ja) |
WO (1) | WO2006067977A1 (ja) |
Families Citing this family (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP5489962B2 (ja) | 2010-11-30 | 2014-05-14 | リオン株式会社 | 粒子計数方法 |
JP5765022B2 (ja) * | 2011-03-31 | 2015-08-19 | ソニー株式会社 | 微小粒子分析装置及び微小粒子分析方法 |
JP6515317B2 (ja) * | 2014-08-06 | 2019-05-22 | パナソニックIpマネジメント株式会社 | 微粒子検知装置 |
CN107615043B (zh) | 2015-04-02 | 2020-08-18 | 粒子监测系统有限公司 | 粒子计数仪器中的激光器噪声检测和缓解 |
WO2016181183A1 (zh) * | 2015-05-10 | 2016-11-17 | 潘镜 | 一种快速统计颗粒计数器粒子个数的识别方法和装置 |
WO2017173285A1 (en) | 2016-04-01 | 2017-10-05 | Tsi Incorporated | Reducing false counts in condensation particle counters |
EP3546924B1 (en) * | 2016-11-22 | 2022-03-30 | RION Co., Ltd. | Microbial particle counting system and microbial particle counting method |
JP6954800B2 (ja) * | 2016-11-22 | 2021-10-27 | リオン株式会社 | 生物粒子計数システムおよび生物粒子計数方法 |
JP7071849B2 (ja) * | 2018-03-09 | 2022-05-19 | リオン株式会社 | パーティクルカウンタ |
CN114486688A (zh) * | 2022-01-28 | 2022-05-13 | 苏州苏信环境科技有限公司 | 一种粒子计数器计量方法、装置、设备及存储介质 |
CN114544441A (zh) * | 2022-02-28 | 2022-05-27 | 苏州苏信环境科技有限公司 | 一种粒子计数器的自检方法、系统、装置及介质 |
Citations (3)
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JPS61240143A (ja) * | 1985-04-17 | 1986-10-25 | Hitachi Ltd | 微小粒子計数装置 |
JPH09159599A (ja) * | 1995-12-05 | 1997-06-20 | Agency Of Ind Science & Technol | 流体清浄度評価方法及び流体清浄度評価装置 |
JPH11271455A (ja) * | 1998-03-25 | 1999-10-08 | Aloka Co Ltd | 放射線測定装置 |
Family Cites Families (6)
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US3987391A (en) * | 1974-12-02 | 1976-10-19 | Coulter Electronics, Inc. | Method and apparatus for correcting total particle volume error due to particle coincidence |
JPH09178645A (ja) | 1995-12-26 | 1997-07-11 | Rion Co Ltd | 光散乱式粒子計数装置 |
DE69819227T2 (de) * | 1997-03-10 | 2004-04-22 | Fuji Electric Co., Ltd., Kawasaki | Vorrichtung und Verfahren zur Trübungsmessung |
JP2002527768A (ja) * | 1998-10-21 | 2002-08-27 | ハイダック フルイドテヒニク ゲゼルシャフト ミット ベシュレンクテル ハフツング | 粒子カウンタのための評価方法および該方法を実施するための装置 |
CN2570775Y (zh) * | 2002-08-08 | 2003-09-03 | 上海市激光技术研究所 | 液体粒子计数器 |
US6784990B1 (en) * | 2003-04-04 | 2004-08-31 | Pacific Scientific Instruments Company | Particle detection system implemented with a mirrored optical system |
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2004
- 2004-12-21 JP JP2004368658A patent/JP3995684B2/ja active Active
-
2005
- 2005-12-09 WO PCT/JP2005/022637 patent/WO2006067977A1/ja active Application Filing
- 2005-12-09 CN CN2005800485181A patent/CN101124471B/zh active Active
- 2005-12-09 US US11/793,883 patent/US7755760B2/en active Active
Patent Citations (3)
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JPS61240143A (ja) * | 1985-04-17 | 1986-10-25 | Hitachi Ltd | 微小粒子計数装置 |
JPH09159599A (ja) * | 1995-12-05 | 1997-06-20 | Agency Of Ind Science & Technol | 流体清浄度評価方法及び流体清浄度評価装置 |
JPH11271455A (ja) * | 1998-03-25 | 1999-10-08 | Aloka Co Ltd | 放射線測定装置 |
Non-Patent Citations (1)
Title |
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Also Published As
Publication number | Publication date |
---|---|
US20080164860A1 (en) | 2008-07-10 |
CN101124471B (zh) | 2011-12-14 |
US7755760B2 (en) | 2010-07-13 |
CN101124471A (zh) | 2008-02-13 |
JP2006177687A (ja) | 2006-07-06 |
JP3995684B2 (ja) | 2007-10-24 |
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