CN108535168B - Small particle condensation growth counter - Google Patents
Small particle condensation growth counter Download PDFInfo
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- CN108535168B CN108535168B CN201810201191.6A CN201810201191A CN108535168B CN 108535168 B CN108535168 B CN 108535168B CN 201810201191 A CN201810201191 A CN 201810201191A CN 108535168 B CN108535168 B CN 108535168B
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- 239000002245 particle Substances 0.000 title claims abstract description 39
- 238000009833 condensation Methods 0.000 title claims abstract description 26
- 230000005494 condensation Effects 0.000 title claims abstract description 26
- 238000001704 evaporation Methods 0.000 claims abstract description 46
- 239000007788 liquid Substances 0.000 claims abstract description 31
- 238000011084 recovery Methods 0.000 claims abstract description 28
- 239000012530 fluid Substances 0.000 claims abstract description 27
- 230000008020 evaporation Effects 0.000 claims abstract description 21
- 239000000443 aerosol Substances 0.000 claims abstract description 19
- 239000012212 insulator Substances 0.000 claims abstract description 14
- 239000011358 absorbing material Substances 0.000 claims abstract description 11
- 238000001914 filtration Methods 0.000 claims abstract description 11
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 11
- 238000000149 argon plasma sintering Methods 0.000 claims abstract description 9
- 239000012224 working solution Substances 0.000 claims description 17
- 239000013618 particulate matter Substances 0.000 claims description 9
- 239000000523 sample Substances 0.000 claims description 8
- 239000004743 Polypropylene Substances 0.000 claims description 3
- 238000001816 cooling Methods 0.000 claims description 3
- 239000000835 fiber Substances 0.000 claims description 3
- -1 polypropylene Polymers 0.000 claims description 3
- 229920001155 polypropylene Polymers 0.000 claims description 3
- 239000004033 plastic Substances 0.000 claims description 2
- 238000004064 recycling Methods 0.000 claims 2
- 239000000463 material Substances 0.000 claims 1
- 238000013461 design Methods 0.000 abstract description 5
- 238000000034 method Methods 0.000 abstract description 4
- 230000017525 heat dissipation Effects 0.000 abstract description 3
- 238000010438 heat treatment Methods 0.000 abstract description 3
- 230000008569 process Effects 0.000 abstract description 3
- 239000002699 waste material Substances 0.000 abstract description 2
- 239000003570 air Substances 0.000 description 14
- 239000002105 nanoparticle Substances 0.000 description 13
- 230000006378 damage Effects 0.000 description 3
- 238000001514 detection method Methods 0.000 description 3
- 230000036541 health Effects 0.000 description 3
- 230000002452 interceptive effect Effects 0.000 description 3
- 230000003287 optical effect Effects 0.000 description 3
- 239000004065 semiconductor Substances 0.000 description 3
- LRHPLDYGYMQRHN-UHFFFAOYSA-N N-Butanol Chemical compound CCCCO LRHPLDYGYMQRHN-UHFFFAOYSA-N 0.000 description 2
- 239000000428 dust Substances 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 239000003344 environmental pollutant Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 231100000719 pollutant Toxicity 0.000 description 2
- 238000005057 refrigeration Methods 0.000 description 2
- 230000029058 respiratory gaseous exchange Effects 0.000 description 2
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 239000012080 ambient air Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 231100000206 health hazard Toxicity 0.000 description 1
- 210000004072 lung Anatomy 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
- 230000006911 nucleation Effects 0.000 description 1
- 238000010899 nucleation Methods 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 231100000331 toxic Toxicity 0.000 description 1
- 230000002588 toxic effect Effects 0.000 description 1
- 230000001988 toxicity Effects 0.000 description 1
- 231100000419 toxicity Toxicity 0.000 description 1
- 239000011882 ultra-fine particle Substances 0.000 description 1
- 238000011144 upstream manufacturing 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
-
- 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
- G01N2015/1022—Measurement of deformation of individual particles by non-optical means
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Dispersion Chemistry (AREA)
- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Sampling And Sample Adjustment (AREA)
Abstract
The invention discloses a small particle condensation growth counter, which comprises: the device comprises a flow dividing system, a filtering device, an evaporating chamber, a heat insulator, a refrigerating sheet, an aerosol inlet, a working fluid recovery device, a working fluid recovery pump, a working fluid storage bottle, a condensing chamber, a pressure measuring device, a light scattering measuring instrument, a flow limiting hole, a tee joint, an air pump and a liquid inlet pump; the inlet of the shunt system is connected with an object to be sampled; the outlet A of the diversion system is connected with the inlet of the filtering device through a hose; the outlet of the filtering device is connected with the evaporation chamber through a hose; the middle cavity of the evaporating chamber is internally fixed with a water absorbing material. The counter adopts a back-to-back design, so that the evaporating chambers and the condensing chambers are changed from the traditional axial arrangement into parallel arrangement, the space is effectively utilized and saved, and the miniaturization of the instrument is realized; the refrigerating sheet is arranged between the evaporating chamber and the condensing chamber, and heat generated in the refrigerating process of the refrigerating sheet is used for heating the evaporating chamber, so that the waste of heat dissipation is reduced, and the heat exhausting fan is omitted.
Description
Technical Field
The invention belongs to the technical field of environmental monitoring, and relates to a small particle condensation growth counter. In particular to a measuring instrument which condenses supersaturated vapor on the surface of particles to enable nano-sized particles to grow to the micron order and counts the particles by using an optical counter.
Background
In recent years, with the prominence of haze pollution in China, people have a higher and higher attention to atmospheric particulates. China will PM in 2012 2.5 Are listed in the ambient air quality standard. PM (particulate matter) 2.5 Is defined as particles with an aerodynamic equivalent diameter of less than or equal to 2.5 microns which are capable of being suspended in air for a long period of time and which enter the human body with respiration, thereby causing a health hazard to the human body. We can speak of PM in general 2.5 Concentration refers to the particulate matter mass concentration. The nano-particles are particles with the particle size smaller than 100 nanometers, and are also called ultra-fine particles. Because the volume of the nano particles is small, the nano particles are easier to enter the human body along with respiration to damage the lung, have strong permeability and can enter cells to disturb normal cell processes. So using the surface area or the particle sizeThe particle count is used for evaluating the damage capability of the particles to human health, and the particle count is relatively more reliable than the mass concentration of the particles. As early as 1996, researchers have found that the size of particulate matter is a large determinant of their toxicity. In other words, even if the chemical components of the nanoparticles are not toxic, they can be ill. And even in PM 2.5 The number concentration of the nano particles can be high under the condition of low concentration, so that the harm of the nano particles to human health is more hidden and uncertain.
Based on the important influences of nano particles on human health, atmospheric environment and the like, new EU motor vehicle particle number standards implemented from 2011 to 9 require an instrument for detecting motor vehicle exhaust emission, and the counting efficiency of 23nm particles should reach 50%. The emphasis of nano particles in China is also strengthened, in the emission limit value and measurement method (fifth stage of China) of light automobile pollutants, which are implemented in the environment protection part of the people's republic of China, the 2013, the 9 month, and the 2018, the 1 month, the 1 day, the emission index of Particle Number (PN) is newly added on the basis of particle quality (PM), and in conclusion, the counting of the nano particles is an important work, and the manufacturing of the particle counter meeting the production and life requirements of people is also necessary.
Particle condensation growth counters (Condensation Particle Counters, CPC) are the most common nanoparticle counting instrument. The basic principle is as follows: forming a supersaturated working liquid environment, introducing aerosol to be detected into the working liquid environment, enabling particles to grow in a condensation mode through heterogeneous nucleation, and counting after the particle size of the particles reaches the lower limit of the optical detection unit.
CPCs are largely classified into two types according to the method of creating a supersaturated environment: hybrid CPC and laminar CPC. Laminar flow CPCs are most commonly used, and a range of commercial CPCs were developed by TSI company, usa, starting with the first commercial laminar flow CPC (TSI 3020). Wherein, part of CPC takes alcohol as working liquid, and part of CPC takes water as working liquid. The TSI 3020 type CPC uses n-butanol as the working fluid and the sample gas stream enters the evaporation chamber and then enters the condensation chamber along with the vapor. Stolzenburg & McMurry improved on the basis of TSI 3020, developed a TSI 3025 type CPC, and adopted a sheath gas design created by Wilson et al, namely, a gas flow is used to limit the aerosol to be measured to the central axis of the condensing chamber, so that air inlet loss is reduced, and counting efficiency is improved. The condensation growth counter uses a semiconductor refrigeration sheet to refrigerate in the design of a condensation chamber. Since the semiconductor refrigeration sheet generates a large amount of heat on the back side in an operating state, its structure requires a large heat dissipating block and fan, which results in a large overall structure. In addition, the heat dissipation of the refrigerating sheets can cause huge energy consumption. It is difficult to meet the portability requirements of scientific research.
Among the published invention patents in China, the patent with the publication number of CN107387500A relates to a detection system for detecting particulate pollutants in fluid, the patent with the publication number of CN107576606A relates to a dust particle counter with a separable probe, and the patent with the publication number of CN107478556A relates to an online dust particle counting monitoring system based on dust-free exhaust design. These patents, while having particle counting functionality, are limited to the range that can be detected by the optical detector, i.e., micron-sized particles.
Aiming at the problems, the invention provides a novel condensation growth counter for nano particles, which overcomes the defects of huge structure and high energy consumption and realizes miniaturization.
Disclosure of Invention
In order to solve the problems, the invention aims to provide a small particle condensation growth counter, which realizes the counting of particles and the miniaturization of instruments, and is suitable for application in laboratory and external field observation.
A small particle condensation growth counter comprising: the device comprises a flow dividing system 1, a filtering device 2, an evaporation chamber 3, a heat insulator 8, a refrigerating sheet 9, an aerosol inlet and working fluid recovery device 10, a working fluid recovery pump 11, a working fluid storage bottle 12, a condensation chamber 13, a pressure measuring device 15, a light scattering measuring instrument 16, a flow limiting hole 17, a tee joint 18, an air pump 19 and a liquid inlet pump 20; an inlet of the shunt system 1 is connected with an object to be sampled; the outlet A of the diversion system 1 is connected with the inlet of the filtering device 2 through a hose; the outlet of the filtering device 2 is connected with the evaporation chamber 3 through a hose; a water absorbing material 4 is fixed in a middle cavity of the evaporating chamber 3, the water absorbing material 4 is polypropylene fiber, and 6 through holes are formed in the middle of the water absorbing material, so that gas can flow conveniently; the outlet of the evaporation chamber 3 is connected with the heat insulator 8; the outlet of the heat insulator 8 is connected with the condensing chamber 13; the inlet A of the aerosol inlet and working solution recovery device 10 is connected with the outlet B of the diversion system 1 through a hose; the aerosol inlet and the outlet B of the working solution recovery device 10 are connected with the working solution recovery pump 11 through a hose; the working fluid recovery pump 11 is connected with the inlet of the working fluid storage bottle 12 through a hose; the outlet of the working fluid storage bottle 12 is connected with the liquid inlet pump 20 through a hose; the liquid inlet pump 20 is connected with the liquid inlet 5 of the evaporation chamber through a hose; an aerosol inlet and an outlet C of the working solution recovery device 10 are connected with an inlet of the condensing chamber 13; the outlet of the condensing chamber 13 is connected with the inlet of the light scattering measuring instrument 16; the outlet of the light scattering measuring instrument 16 is connected with the flow limiting hole 17 through a hose; the flow limiting hole 17 is connected with the joint A of the tee joint 18 through a hose; the joint B of the tee joint 18 is connected with the air pump 19 through a hose; the tee joint 18 interface C is connected with the pressure measuring device 15 through a hose; the pressure measuring device 15 is respectively connected with the evaporating chamber pressure measuring nozzle 7 and the condensing chamber pressure measuring nozzle 14 through hoses; the evaporating chambers 3 and the condensing chambers 13 are arranged in parallel, and the refrigerating sheets 9 are fixed between the evaporating chambers and the condensing chambers.
The evaporating chamber 3 is shown in fig. 2, a temperature sensor is placed at a position 301, a position 302 is connected with the evaporating chamber liquid inlet 5 through threads, a position 303 is connected with the temperature probe 6 through threads, and a position 304 is connected with the evaporating chamber pressure measuring nozzle 7 through threads.
The insulator 8, as shown in fig. 3, is made of conductive plastic and delivers the working fluid vapor into the condensing chamber.
As shown in fig. 4, the aerosol inlet and working fluid recovery device 10 is structured 1001, namely, the inlet a is connected with the outlet B of the diversion system 1 through a hose; the structure 1002 is the outlet B, and is connected with the working fluid recovery pump 11 through a hose; structure 1003 is the outlet C, and is connected to the inlet of the condensation chamber 13.
As shown in fig. 5, the condensing chamber 13 is provided with a position 1301 for fixing the cooling plate 9, a position 1302 for connecting with the outlet of the heat insulator 8, and a position 1303 for placing a temperature sensor.
The beneficial effects of the invention are as follows:
the invention provides a small particle condensation growth counter which can count nano particles in the atmosphere. The invention has the advantages that: the back-to-back design is adopted, so that the traditional axial arrangement of the evaporating chambers and the condensing chambers is changed into parallel arrangement, the space is effectively utilized and saved, and the miniaturization of the instrument is realized; the refrigerating sheet is arranged between the evaporating chamber and the condensing chamber, and heat generated in the refrigerating process of the refrigerating sheet is used for heating the evaporating chamber, so that the waste of heat dissipation is reduced, and the heat exhausting fan is omitted.
Drawings
FIG. 1 is a schematic diagram of a small particle condensation growth counter according to the present invention.
Fig. 2 is a schematic perspective view of an evaporation chamber of the counter of the present invention.
Fig. 3 is a schematic perspective view of a counter insulator according to the present invention.
Fig. 4 is a schematic perspective view of an aerosol inlet and working fluid recovery device of the counter of the present invention.
Fig. 5 is a schematic perspective view of a condensation chamber of the counter of the present invention.
In the figure:
1-split-flow system 2-filter 3-evaporation chamber
4-water-absorbing material 5-evaporating chamber liquid inlet 6-temperature probe
7-evaporating chamber pressure measuring nozzle 8-heat insulator 9-refrigerating sheet
10-aerosol inlet, working solution recovery device 11-working solution recovery pump 12-working solution storage bottle
13-condensing chamber 14-condensing chamber pressure measuring nozzle 15-pressure measuring device
16-light scattering measuring instrument 17-flow limiting hole 18-tee joint
19-air pump 20-liquid inlet pump
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
The air flow to be measured firstly enters a diversion system 1, 80% (by volume flow meter) of the air flow passes through a filtering device 2 to remove contained particles and then enters an evaporation chamber 3 fixed with a water absorbing material 4, wherein the water absorbing material is polypropylene fiber, and 6 through holes are formed in the middle of the water absorbing material, so that the air flow is convenient. The working fluid at high temperature evaporates into a vapor, which passes through the insulator 8 with the air flow into the condensing chamber 13, creating a supersaturated environment for the working fluid at low temperature. The other 20 percent (in terms of volume flowmeter) of the airflow to be detected directly enters the condensing chamber 13 through the aerosol inlet and the working solution recovery device 10, working solution vapor is condensed on the surface of particles in a supersaturated environment, the particles grow by moisture absorption, and the particle size is detected and counted after reaching the detection lower limit of the light scattering measuring instrument 16.
Wherein the air flow is controlled by a flow restrictor orifice 17 and by a pressure measuring device 15. The principle is as follows: when the air flow speed passing through the flow limiting hole reaches the sound speed, the pressure difference between the upstream and the downstream is increased, and the air flow speed is kept unchanged and still is the sound speed, so that the air flow can be controlled. The pressure measuring device 15 is respectively connected with the evaporating chamber pressure measuring nozzle 7, the condensing chamber pressure measuring nozzle 14 and the tee joint 18 at the downstream of the limiting hole 17, so that the pressure difference between the front and the rear of the limiting hole 17 is measured, and the flow can be maintained at a fixed value after the pressure difference is larger than the critical pressure difference.
The liquid level control and recovery of the working liquid are realized by the temperature probe 6, the aerosol inlet, the working liquid recovery device 10, the working liquid recovery pump 11 and the liquid inlet pump 20. The principle is as follows: the temperature probe 6 has different resistances when above and below the liquid level, and when above the liquid level, the computer interactive control system starts the liquid inlet pump 20 to enable the working solution to enter the evaporation chamber; when it is below the liquid level, the operation of the feed pump 20 is stopped by the computer interactive control system. The condensed liquid in the condensation chamber remains along the walls and is recovered by the aerosol inlet and working fluid recovery device 10 into the working fluid storage bottle 12. The amount of liquid in the working liquid storage bottle 12 is periodically checked.
The temperatures of the evaporation chamber 3 and the condensation chamber 13 are controlled by the refrigerating sheet 9 and temperature sensors disposed on the evaporation chamber 3 and the condensation chamber 13. The principle is as follows: the refrigerating sheet 9 is a semiconductor refrigerating sheet, and one side is refrigerated while the other side is used for radiating heat. The refrigerating surface of the refrigerating sheet 9 is attached to the condensing chamber 13, and the radiating surface is attached to the evaporating chamber 3, so that the functions of refrigerating and heating are achieved. The cooling fin 9 is controlled by temperature sensors and an interactive control system on the evaporation chamber 3 and the condensation chamber 13 to bring both to a set temperature. The whole counter is mechanically fixed through a screw, and the air tightness is ensured through an O-shaped ring at the joint.
The above embodiments are described in detail with respect to the technical solution of the present invention. It is obvious that the invention is not limited to the described embodiments. Based on the embodiments of the present invention, those skilled in the art can make various changes thereto, but any changes equivalent or similar to the present invention are within the scope of the present invention.
Claims (10)
1. A small particle condensation growth counter comprising: the device comprises a flow dividing system, a filtering device, an evaporating chamber, a heat insulator, a refrigerating sheet, an aerosol inlet, a working fluid recovery device, a working fluid recovery pump, a working fluid storage bottle, a condensing chamber, a pressure measuring device, a light scattering measuring instrument, a flow limiting hole, a tee joint, an air pump and a liquid inlet pump; the inlet of the shunt system is connected with an object to be sampled; the outlet A of the diversion system is connected with the inlet of the filtering device through a hose; the outlet of the filtering device is connected with the evaporation chamber through a hose; a water absorbing material is fixed in the middle cavity of the evaporating chamber; the outlet of the evaporation chamber is connected with the heat insulator; the outlet of the heat insulator is connected with the condensing chamber; the inlet A of the aerosol inlet and the working solution recovery device is connected with the outlet B of the diversion system through a hose; the aerosol inlet and the working solution recycling device outlet B are connected with the working solution recycling pump through a hose; the working solution recovery pump is connected with the inlet of the working solution storage bottle through a hose; the outlet of the working solution storage bottle is connected with the liquid inlet pump through a hose; the liquid inlet pump is connected with the liquid inlet of the evaporation chamber through a hose; the aerosol inlet and the outlet C of the working solution recovery device are connected with the inlet of the condensing chamber; the outlet of the condensing chamber is connected with the inlet of the light scattering measuring instrument; the outlet of the light scattering measuring instrument is connected with the flow limiting hole through a hose; the flow limiting hole is connected with the tee joint A through a hose; the three-way interface B is connected with the air pump through a hose; the three-way connector C is connected with the pressure measuring device through a hose; the pressure measuring device is respectively connected with the evaporating chamber pressure measuring nozzle and the condensing chamber pressure measuring nozzle through hoses; the evaporating chambers and the condensing chambers are arranged in parallel, and refrigerating sheets are fixed between the evaporating chambers and the condensing chambers.
2. The counter of claim 1, wherein the evaporation chamber is provided with a temperature sensor and is connected to the evaporation chamber liquid inlet through threads, to the temperature probe through threads, and to the evaporation chamber pressure measuring nozzle through threads.
3. The counter of claim 1 wherein the insulator is a conductive plastic material that delivers working fluid vapor to the condensing chamber.
4. The counter of claim 1 wherein the condensing chamber is connected to the insulator outlet and carries a temperature sensor.
5. The counter according to claim 1, wherein 80% of the gas to be measured is filtered by the filtering device to remove the particulate matter contained therein, and then enters the evaporation chamber with the water absorbing material fixed thereto, and the remaining 20% is directly introduced into the condensation chamber through the aerosol inlet and the working fluid recovery device.
6. The counter of claim 1, wherein the flow of the gas to be measured is controlled by a restrictor orifice and a pressure measuring device.
7. The counter of claim 1 wherein the liquid level control and recovery of the working fluid is accomplished by a temperature probe, an aerosol inlet and working fluid recovery device, a working fluid recovery pump, and a liquid inlet pump.
8. The counter of claim 1, wherein the temperatures of the evaporation chamber and the condensation chamber are controlled by a cooling fin and a temperature sensor disposed on the evaporation chamber and the condensation chamber.
9. The counter of claim 1 wherein the counter is mechanically fastened in its entirety by screws and sealed by O-rings at the connection.
10. The counter of claim 1 wherein the water absorbing material is polypropylene fiber with 6 holes in the middle to facilitate gas flow.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810201191.6A CN108535168B (en) | 2018-03-12 | 2018-03-12 | Small particle condensation growth counter |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810201191.6A CN108535168B (en) | 2018-03-12 | 2018-03-12 | Small particle condensation growth counter |
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| CN108535168A CN108535168A (en) | 2018-09-14 |
| CN108535168B true CN108535168B (en) | 2023-11-28 |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109323976B (en) * | 2018-11-07 | 2021-07-16 | 中国科学院合肥物质科学研究院 | Temperature control device of condensation particle counter |
| WO2020256788A1 (en) * | 2019-06-19 | 2020-12-24 | Tsi Incorporated | Wick fluid system |
| CN110389150B (en) * | 2019-07-26 | 2022-04-01 | 南京信息工程大学 | Measuring system for atmospheric ice nucleus activation rate |
| CN111122419A (en) * | 2019-12-05 | 2020-05-08 | 中国科学院合肥物质科学研究院 | Condensation particle counter |
| CN113375994A (en) * | 2021-06-23 | 2021-09-10 | 中国计量科学研究院 | Layer flow type condensation nucleus aerosol particle growth device and growth method thereof |
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| CN106383075A (en) * | 2016-11-04 | 2017-02-08 | 中国人民解放军军事医学科学院微生物流行病研究所 | Condensation nucleus particle growth device |
| CN106680057A (en) * | 2016-12-27 | 2017-05-17 | 中国科学院合肥物质科学研究院 | Nano-level particulate matter supersaturated growth device and control method |
| CN208026594U (en) * | 2018-03-12 | 2018-10-30 | 清华大学 | A kind of small particle object condensation growth counter |
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