CN102749273B - A kind of aerosol particle size classification detection system - Google Patents
A kind of aerosol particle size classification detection system Download PDFInfo
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- CN102749273B CN102749273B CN201110098903.4A CN201110098903A CN102749273B CN 102749273 B CN102749273 B CN 102749273B CN 201110098903 A CN201110098903 A CN 201110098903A CN 102749273 B CN102749273 B CN 102749273B
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Abstract
The invention discloses a kind of aerosol particle size classification detection system, it comprises: differential electromobility analyzer and laser particle detecting unit, wherein, differential electromobility analyzer is used for adding the identical quantity of electric charge to the particulate to be detected entered, recycle different electric field intensity the particulate of different quality is classified, of a sort particulate is sent into laser particle detecting unit and detects.
Description
Technical field
The present invention relates to particulate detection system, in particular to a kind of aerosol particle size classification detection system.
Background technology
The aerosol particle optical measuring system be made up of illumination path, gasoloid gas circuit and detection light path is commonly used to measure the size of aerosol particle, utilize ultraviolet laser and fluorescence detection device to detect the characteristic fluorescence of particulate simultaneously, thus realize the real-time detection of particulate.Existing particulate detection system can detect concentration and the quantity whether in air with particulate and particulate by real-time online.
But, in existing particulate detection system, because the particle diameter of particulate to be detected is different, final data analysis is made to become complicated, such as, the particle of different-grain diameter can cause the change of trigger rate, and then affects the energy of Ultra-Violet Laser, causes the inaccurate of final fluorescence intensity data.
Summary of the invention
The invention provides a kind of aerosol particle size classification detection system, in order to improve the accuracy of detection of detection system.
For achieving the above object, the invention provides a kind of aerosol particle size classification detection system, it comprises: differential electromobility analyzer and laser particle detecting unit, wherein
Differential electromobility analyzer is used for adding the identical quantity of electric charge to the particulate to be detected entered, recycle different electric field intensity the particulate of different quality is classified, of a sort particulate is sent into laser particle detecting unit and detects.
Preferably, above-mentioned differential electromobility analyzer comprises: outer tube, and particulate to be detected from up to down enters outer tube by injection port; Interior pipe, be positioned at outer tube, the central axes of its central axis and outer tube, interior pipe has slit, the vertical range of slit and injection port is the first setting value, the horizontal range of slit and injection port is the second setting value, and the top of slit is electrode in, and the polarity of interior electrode is contrary with a particulate to be detected charged polarity.
Preferably, above-mentioned laser particle detection system also comprises: particle diameter alignment unit, for the particle diameter of the particulate selected by computing differential electromobility analyzer; Data processing unit, the fluoroscopic examination result that particle diameter and laser particle detecting unit for receiving particle detect, and according to the particle diameter of particle, fluoroscopic examination result is corrected.
In the above-described embodiments, according to the migrate attribute of particulate under different voltage, particulate is classified, thus of a sort particulate feeding laser particle detecting unit is detected, reduce the complexity of data analysis, the particle solving various particle diameter causes the problem of erroneous judgement simultaneously when detecting, improve detection sensitivity and the signal to noise ratio (S/N ratio) of detection system.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is aerosol particle size classification detection system schematic diagram according to an embodiment of the invention;
Fig. 2 is the structural representation of laser particle detecting unit according to an embodiment of the invention;
Fig. 3 is aerosol particle size classification detection system schematic diagram in accordance with a preferred embodiment of the present invention;
Fig. 4 is the droplet measurement effect contrast figure of one embodiment of the invention aerosol particle size classification detection system.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not paying the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
Fig. 1 is aerosol particle size classification detection system schematic diagram according to an embodiment of the invention.As shown in Figure 1, this system comprises: differential electromobility analyzer and laser particle detecting unit, wherein
Differential electromobility analyzer is used for adding the identical quantity of electric charge to the particulate to be detected entered, recycle different electric field intensity the particulate of different quality is classified, of a sort particulate is sent into laser particle detecting unit and detects.
In the present embodiment, according to the migrate attribute of particulate under different voltage, particulate is classified, thus of a sort particulate feeding laser particle detecting unit is detected, reduce the complexity of data analysis, the particle solving various particle diameter causes the problem of erroneous judgement simultaneously when detecting, improve detection sensitivity and the signal to noise ratio (S/N ratio) of detection system.
In the present embodiment, electric field intensity can change flexibly, and then selects various grain diameter component more accurately.
Such as, the differential electromobility analyzer in above-described embodiment comprises: outer tube, and particulate to be detected from up to down enters outer tube by injection port; Interior pipe, is positioned at outer tube, the central axes of its central axis and outer tube, and interior pipe has slit, and the vertical range of slit and injection port is the first setting value h
1, the horizontal range of slit and injection port is the second setting value h
2, the top of slit is electrode in, and the polarity of interior electrode is contrary with a particulate to be detected charged polarity.
As seen from Figure 1, particulate to be detected enters in the electrostatic field in annular region by injection port, under the effect of certain electric field intensity, certain accurate grain diameter component is selected, and the specific algorithm of selected mass particle is as shown in formula (1):
Wherein, m is mass particle, and E is electric field intensity, q by the charged electricity of particle, g be acceleration of gravity, h
1for the vertical range of injection port and slit, h
2for the horizontal range of injection port and slit.
As can be seen from formula (1) above, when particle the identical and injection port of charged electricity determine with the vertical of slit and horizontal range, the quality of selected particle is only directly proportional to electric field intensity.Therefore, when interior electrode adds positive voltage, particle electronegative in sample will float towards interior electrode through annular region, and this drift is superimposed with moving downward of air-flow, and acting in conjunction makes charged particle float towards the diverse location of central electrode.When adding different voltage when between electrode, the particle of different-grain diameter size can arrive the slit of interior electrode base, thus the detection system entering downstream detects.
Fig. 2 is the structural representation of laser particle detecting unit according to an embodiment of the invention.As seen from Figure 2, the sample particle that differential electromobility analyzer exports is sent in the top nozzle 6 of laser particle monitoring system and is detected, now, particle diameter size to be detected is relatively fixing, the trigger rate of ultraviolet laser and the stability of Output of laser energy can be improved, and then improve the precision of fluoroscopic examination.
Fig. 3 is aerosol particle size classification detection system schematic diagram in accordance with a preferred embodiment of the present invention.In the present embodiment, above-mentioned testing result can utilize the classification results of differential electromobility analyzer further to calibrate.As shown in Figure 3, for improving the accuracy of detection of detection system, this laser particle detection system also comprises:
Particle diameter alignment unit, for the particle diameter of the particulate selected by computing differential electromobility analyzer;
Data processing unit, the fluoroscopic examination result that particle diameter and laser particle detecting unit for receiving particle detect, and according to the particle diameter of particle, fluoroscopic examination result is corrected.
As seen from Figure 3, the particle diameter information entering laser particle detection system after the classification of differential electromobility analyzer can be calculated by above-mentioned formula (1), after the detection completing particulate scattered light and fluorescence, this information can send into data processing unit by particle diameter alignment unit, the particle diameter of particulate and fluoroscopic examination result are further calibrated, thus greatly improves the measuring accuracy of particle diameter.
Fig. 4 is the droplet measurement effect contrast figure of one embodiment of the invention aerosol particle size classification detection system.As seen from Figure 4, after classification, the particle size range of detection obviously reduces, thus improves the whole detection precision of detection system.
In sum, the above embodiment of the present invention achieves following beneficial effect:
The particle of different-grain diameter can be carried out categorizing selection by embodiments of the invention, makes data analysis become complicated when avoiding the particle of different-grain diameter to detect simultaneously, and can correct more accurately testing result according to formula (1) calculating.
One of ordinary skill in the art will appreciate that: accompanying drawing is the schematic diagram of an embodiment, the module in accompanying drawing or flow process might not be that enforcement the present invention is necessary.
One of ordinary skill in the art will appreciate that: the module in the device in embodiment can describe according to embodiment and be distributed in the device of embodiment, also can carry out respective change and be arranged in the one or more devices being different from the present embodiment.The module of above-described embodiment can merge into a module, also can split into multiple submodule further.
Last it is noted that above embodiment is only in order to illustrate technical scheme of the present invention, be not intended to limit; Although with reference to previous embodiment to invention has been detailed description, those of ordinary skill in the art is to be understood that: it still can be modified to the technical scheme described in previous embodiment, or carries out equivalent replacement to wherein portion of techniques feature; And these amendments or replacement, do not make the essence of appropriate technical solution depart from the spirit and scope of embodiment of the present invention technical scheme.
Claims (1)
1. an aerosol particle size classification detection system, is characterized in that, comprising: differential electromobility analyzer and laser particle detecting unit, wherein
Described differential electromobility analyzer is used for adding the identical quantity of electric charge to the particulate to be detected entered, recycle different electric field intensity the particulate of different quality is classified, of a sort particulate is sent into described laser particle detecting unit and detect;
Described aerosol particle size classification detection system also comprises:
Particle diameter alignment unit, for calculating the particle diameter of the particulate selected by described differential electromobility analyzer;
Data processing unit, the fluoroscopic examination result that particle diameter and described laser particle detecting unit for receiving described particle detect, and according to the particle diameter of described particle, described fluoroscopic examination result is corrected;
Wherein, described differential electromobility analyzer comprises:
Outer tube, particulate to be detected from up to down enters described outer tube by injection port;
Interior pipe, be positioned at described outer tube, the central axes of its central axis and described outer tube, described interior pipe has slit, the vertical range of described slit and described injection port is the first setting value, the horizontal range of described slit and described injection port is the second setting value, and the top of described slit is electrode in, and the polarity of described interior electrode is contrary with a particulate to be detected charged polarity;
Particulate to be detected enters in the electrostatic field in annular region by injection port, under the effect of certain electric field intensity, certain accurate grain diameter component is selected, the specific algorithm of selected mass particle as shown by the equation:
Wherein, m is mass particle, and E is electric field intensity, q by the charged electricity of particle, g be acceleration of gravity, h
1for the vertical range of injection port and slit, h
2for the horizontal range of injection port and slit;
When particle the identical and injection port of charged electricity determine with the vertical of slit and horizontal range; in sample, charged particle will float towards interior electrode through annular region; this drift is superimposed with moving downward of air-flow; acting in conjunction makes charged particle float towards the diverse location of central electrode; when adding different voltage when between electrode; the particle of different-grain diameter size can arrive the slit of interior electrode base, thus the detection system entering downstream detects.
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| CN201110098903.4A CN102749273B (en) | 2011-04-20 | 2011-04-20 | A kind of aerosol particle size classification detection system |
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| CN102749273B true CN102749273B (en) | 2016-03-30 |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103105350B (en) * | 2013-01-23 | 2016-03-16 | 清华大学 | 3nm-20 μm of gasoloid particle diameter distribution measuring apparatus |
| CN103135641B (en) * | 2013-01-23 | 2015-02-18 | 清华大学 | Voltage-and-flow control system used for measurement of aerosol particle size distribution |
| CN108732080B (en) * | 2018-04-24 | 2020-12-18 | 台州学院 | Particle size separation device |
| WO2020006654A1 (en) * | 2018-07-02 | 2020-01-09 | 清华大学 | System and method for measuring electromobility particle-size spectrum of aerosol |
| CN112816381B (en) * | 2021-02-26 | 2024-04-26 | 中山大学 | Aerosol particulate matter detecting system |
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| CN1869648A (en) * | 2006-06-12 | 2006-11-29 | 中国科学院合肥物质科学研究院 | System for detecting harmful nano-particles in air |
| CN201083677Y (en) * | 2007-09-26 | 2008-07-09 | 中国人民解放军军事医学科学院微生物流行病研究所 | Aerosol granule optical detection system |
| CN101398367A (en) * | 2007-09-26 | 2009-04-01 | 中国人民解放军军事医学科学院微生物流行病研究所 | Aerated solids particle laser analyzer |
| CN101981429A (en) * | 2008-02-06 | 2011-02-23 | 巴斯夫欧洲公司 | Measurement system for the multidimensional aerosol characterization |
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| AT502207B1 (en) * | 2005-08-05 | 2007-11-15 | Univ Wien | METHOD FOR CLASSIFYING AND DISCONNECTING PARTICLES AND DEVICE FOR CARRYING OUT THIS METHOD |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1869648A (en) * | 2006-06-12 | 2006-11-29 | 中国科学院合肥物质科学研究院 | System for detecting harmful nano-particles in air |
| CN201083677Y (en) * | 2007-09-26 | 2008-07-09 | 中国人民解放军军事医学科学院微生物流行病研究所 | Aerosol granule optical detection system |
| CN101398367A (en) * | 2007-09-26 | 2009-04-01 | 中国人民解放军军事医学科学院微生物流行病研究所 | Aerated solids particle laser analyzer |
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