CN108267388B - Aerosol scattering coefficient moisture absorption growth measuring instrument and measuring method - Google Patents
Aerosol scattering coefficient moisture absorption growth measuring instrument and measuring method Download PDFInfo
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- CN108267388B CN108267388B CN201810107423.1A CN201810107423A CN108267388B CN 108267388 B CN108267388 B CN 108267388B CN 201810107423 A CN201810107423 A CN 201810107423A CN 108267388 B CN108267388 B CN 108267388B
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- 239000000443 aerosol Substances 0.000 title claims abstract description 91
- 238000010521 absorption reaction Methods 0.000 title claims abstract description 23
- 238000000034 method Methods 0.000 title claims abstract description 23
- 239000002245 particle Substances 0.000 claims abstract description 20
- 238000001035 drying Methods 0.000 claims abstract description 12
- 238000012545 processing Methods 0.000 claims abstract description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 54
- 239000012528 membrane Substances 0.000 claims description 29
- 238000005259 measurement Methods 0.000 claims description 19
- 230000036760 body temperature Effects 0.000 claims description 3
- 239000007788 liquid Substances 0.000 claims description 3
- 239000005427 atmospheric aerosol Substances 0.000 abstract description 5
- 238000002347 injection Methods 0.000 abstract description 2
- 239000007924 injection Substances 0.000 abstract description 2
- 239000003570 air Substances 0.000 description 44
- 230000008859 change Effects 0.000 description 8
- 239000003102 growth factor Substances 0.000 description 8
- 230000008569 process Effects 0.000 description 7
- 230000003247 decreasing effect Effects 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- 229920000557 Nafion® Polymers 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000010790 dilution Methods 0.000 description 2
- 239000012895 dilution Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000012466 permeate Substances 0.000 description 2
- 230000000704 physical effect Effects 0.000 description 2
- 108010063499 Sigma Factor Proteins 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 239000012080 ambient air Substances 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 238000003908 quality control method Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 239000000741 silica gel Substances 0.000 description 1
- 229910002027 silica gel Inorganic materials 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000009897 systematic effect Effects 0.000 description 1
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- 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
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- 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
- G01N2015/0023—Investigating dispersion of liquids
- G01N2015/0026—Investigating dispersion of liquids in gas, e.g. fog
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- 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
- G01N2015/0042—Investigating dispersion of solids
- G01N2015/0046—Investigating dispersion of solids in gas, e.g. smoke
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- General Health & Medical Sciences (AREA)
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Abstract
The invention provides an aerosol scattering coefficient moisture absorption and growth measuring instrument, which comprises a drying system, an air humidity control system, a data acquisition and processing system and an aerosol scattering coefficient measuring system, wherein a humidifying device used by the air humidity control system adopts an air-air conveying scheme, namely, a moisture permeation tube outer cavity is wet air with certain humidity, and moisture is conveyed to a sample injection airflow in the permeation tube according to a moisture pressure difference of air inside and outside the permeation tube. In addition, the invention also provides a method for measuring the volatilization characteristics of the atmospheric aerosol, wherein the aerosol scattering coefficient hygroscopic growth measuring instrument is used for measuring the scattering hygroscopic growth capacity of the atmospheric aerosol particles. Compared with the prior art, the aerosol scattering coefficient moisture absorption and growth measuring instrument and the measuring method provided by the invention have the function of measuring the atmospheric scattering coefficient under different relative humidities, and are high in automation degree and good in stability.
Description
Technical Field
The invention relates to atmosphere detection equipment, in particular to an aerosol scattering coefficient moisture absorption and growth measuring instrument and a measuring method.
Background
The hydroscopic property of the aerosol describes the interaction of aerosol particles and water vapor under certain water vapor conditions, is related to the physical property and chemical property of the aerosol, influences the optical property and cloud physical property of the aerosol, and belongs to one of the basic problems in aerosol research.
Currently, the method for measuring the moisture absorption growth of the aerosol mainly comprises two types of particle size moisture absorption growth and scattering coefficient moisture absorption growth. Although research and development of measuring instruments for aerosol hygroscopicity have been carried out earlier by foreign scientific institutions, the measurement of the moisture absorption growth factor of aerosols with a specified particle size or the measurement of aerosols generated in a laboratory with a single property is mainly focused. For the measurement of the moisture absorption and growth of the scattering coefficient, the humidifying method adopts two modes of dilution/mixing, water-gas exchange and the like, wherein the former has the defects that the mixed wet air can change the aerosol concentration of the sample gas, the relative humidity distribution is uneven, and the method is difficult to be applied to the measurement of mixed aerosol under the condition of ambient atmosphere; the latter has the advantage of higher humidification efficiency, and the disadvantage that it is more difficult to achieve because the humidity depends on the water bath temperature and the permeation efficiency of the selected permeation tube, and when the permeation efficiency is high, low humidity requires a lower water temperature (well below ambient temperature).
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide an aerosol scattering coefficient moisture absorption and growth measuring instrument and a measuring method, which have the function of measuring the atmospheric scattering coefficient under different relative humidities, and have high automation degree and good stability.
The invention provides an aerosol scattering coefficient moisture absorption and growth measuring instrument, which comprises a drying system, an air humidity control system, a data acquisition and processing system and an aerosol scattering coefficient measuring system, wherein:
the drying system comprises a dryer (1), a first pump (2), a limiting hole (3), a first particle filter (4), a first temperature and humidity sensor (5) and a three-way valve (6), wherein an outlet of the first particle filter (4) is connected with an inlet of the limiting hole (3), an outlet of the limiting hole (3) is connected with an outer wall input end of the dryer (1), an outer wall output end of the dryer (1) is connected with the first pump (2), a permeable membrane outlet of the dryer (1) is connected with the three-way valve (6), and the first temperature and humidity sensor (5) is arranged on a pipeline connected with the permeable membrane outlet of the dryer (1) and the three-way valve (6);
the air humidity control system comprises a three-way valve (6), a membrane permeation type air-air humidifier (8), a second pump (9), a second particle filter (10), a water tank (11), a water heater (12), a water temperature sensor (13), a water tank temperature controller (14) and a second temperature and humidity sensor (15), wherein an outlet of the three-way valve (6) is connected with a sample air inlet of the membrane permeation type air-air humidifier (8), a sample air outlet of the membrane permeation type air-air humidifier (8) is connected with an air inlet of a second aerosol scattering coefficient measuring system (16), an air inlet of the second pump (9) is connected with a sheath air outlet of the membrane permeation type air-air humidifier (8), a sheath air inlet of the membrane permeation type air-air humidifier (8) is connected with a moisture air outlet of the water tank (11), air is connected with an air inlet of the water tank (11) through the second particle filter (10), and the water heater (12) and the water temperature sensor (13) in the water tank (11) are arranged below the liquid level and are connected with the water tank temperature controller (14);
the data acquisition processing system comprises a data acquisition card and data monitoring software which are electrically connected; the first temperature and humidity sensor (5), the second temperature and humidity sensor (15), the water body temperature sensor (13) and the water tank temperature controller (14) are electrically connected with the data acquisition card;
a three-way valve (6) of a sample gas outlet of the drying system is connected to a gas inlet of a first aerosol scattering coefficient measuring system (7) and is used for measuring the scattering coefficient of the dried aerosol; the sample gas outlet of the air humidity control system is connected with a second temperature and humidity sensor (15), and the sample gas subjected to humidity control enters the air inlet of a second aerosol scattering coefficient measurement system (16) and is used for measuring the scattering coefficient of the humidified aerosol.
Preferably, the dryer (1) is a membrane penetration dryer.
In addition, the invention also provides an aerosol scattering coefficient hygroscopic growth measuring method, which is used for measuring the scattering hygroscopic growth capacity of the atmospheric aerosol particles by using the aerosol scattering coefficient hygroscopic growth measuring instrument.
Compared with the prior art, the aerosol scattering coefficient moisture absorption and growth measuring instrument and the measuring method provided by the invention have the advantages that the silica gel moisture absorption or humidification pipe is utilized for drying the sample gas in the drying system, so that the humidity of the sample gas is lower than 30%.
The principle of the air humidity control system is as follows: the Nafion membrane divides the humidifying pipe into an inner part and an outer part, the principle that the water vapor at two ends of the Nafion membrane is high in pressure and low in permeability to the water vapor is utilized, the sample gas runs in the pipe, the outside of the pipe is a certain humidity (high humidity) air flow, and the water vapor outside the pipe permeates into the pipe, so that the effect of humidifying the sample gas is achieved based on the principle. The humidity change of the sample gas is modulated by controlling the flow rate of the air flow outside the tube, and the humidity change is increased to 90% from a dry state of less than 30% and then decreased to 30% from 90%.
Sample gas humidity was modulated as follows:
first point, generation of a certain humidity (high humidity) air flow outside the tube: the ambient air is filtered by a second particle filter (10) to become clean air, the clean air enters a water tank (11), bubbles into a certain humidity (high humidity) air flow at the lower part of the water body of the water tank (11), and enters the outside of a humidifying pipe;
the water level and the temperature of the water tank (11) at the second point are required to be kept in a certain range;
third point, sample gas low humidity starting point: when the flow rate of a certain humidity (high humidity) airflow outside the humidifying pipe is 0, and water vapor is not supplemented, the humidity of the airflow outside the pipe is reduced along with the permeation of the water vapor into the pipe until the humidity of the airflow is equivalent to that of the sample gas in the pipe, and the humidity of the sample gas reaches the lowest value serving as a starting point;
fourth, sample gas humidity rising process: the flow rate of the air flow with certain humidity (high humidity) outside the tube is gradually increased (up to 10 LPM), water vapor in the air flow is supplemented, and the air flow continuously permeates and humidifies the inside of the tube until the humidity of the sample gas inside the tube reaches 90%;
fifth point, sample gas humidity decreasing process: after the humidity of the sample gas in the tube reaches 90%, starting a humidity reducing process, gradually reducing the flow rate of the air flow with certain humidity (high humidity) outside the tube until the air flow reaches 0, and performing a humidity modulating effect on the sample gas as described in the third point;
sixth, sample gas humidity change cycle process: when the humidity of the sample gas in the tube is lowered to 30% or less as described in the fifth point, the sample gas humidity raising process as described in the fourth point is restarted, and the cycle is thus repeated.
The air humidity control system adopts a 'gas-gas' conveying scheme, namely, the outer cavity of the water vapor permeation tube is wet air with certain humidity, and water vapor is conveyed to the sample injection airflow in the permeation tube according to the water vapor pressure difference of the air inside and outside the permeation tube. Compared with a dilution/mixing mode, the air humidity control system does not change the aerosol concentration of the sample gas, and has uniform relative humidity distribution; compared with the water-gas exchange mode, the humidity control is more stable, and the device and the control method are simple.
Compared with the prior art, the aerosol scattering coefficient moisture absorption and growth measuring instrument and the measuring method have the function of measuring the atmospheric scattering coefficient under different relative humidities, and are high in automation degree and good in stability.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required to be used in the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are only embodiments of the present invention, and that other drawings can be obtained according to the provided drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic structural diagram of an aerosol scattering coefficient hygroscopic growth measuring instrument according to the present invention;
FIG. 2 is a graph showing the comparison of two dry and wet (both dry and wet RH < 30%) measurements of the aerosol scattering coefficient of a region detected by the aerosol scattering coefficient hygroscopic growth measuring instrument according to the present invention;
FIG. 3 is a graph showing the variation of the aerosol scattering moisture absorption growth factor f (RH) with humidity of the aerosol scattering coefficient moisture absorption growth measuring instrument according to the present invention;
FIG. 4 is a software interface of an aerosol scattering coefficient hygroscopic growth gauge system according to the present invention;
fig. 5 shows statistical probabilities of f (RH) at different humidities, and it can be seen from the figure that the lower RH is, the more concentrated the value of f (RH) is, and the higher RH is, the more dispersed the value of f (RH) is.
Detailed Description
Referring to fig. 1 to 5, fig. 1 is a schematic structural diagram of an aerosol scattering coefficient hygroscopic growth measuring instrument according to the present invention; FIG. 2 is a graph showing the comparison of two dry and wet (both dry and wet RH < 30%) measurements of the aerosol scattering coefficient of a region detected by the aerosol scattering coefficient hygroscopic growth measuring instrument according to the present invention; FIG. 3 is a graph showing the variation of the aerosol scattering moisture absorption growth factor f (RH) with humidity of the aerosol scattering coefficient moisture absorption growth measuring instrument according to the present invention; FIG. 4 is a software interface of an aerosol scattering coefficient hygroscopic growth gauge system according to the present invention; fig. 5 shows statistical probabilities of f (RH) at different humidities, and it can be seen from the figure that the lower RH is, the more concentrated the value of f (RH) is, and the higher RH is, the more dispersed the value of f (RH) is.
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
As shown in fig. 1, the aerosol scattering coefficient hygroscopic growth measuring instrument of the present invention comprises: the aerosol scattering coefficient moisture absorption and growth measuring instrument comprises a drying system, an air humidity control system, a data acquisition and processing system and an aerosol scattering coefficient measuring system, wherein:
the drying system comprises a membrane permeation type dryer 1, a first pump 2, a limiting hole 3, a first particle filter 4, a first temperature and humidity sensor 5 and a three-way valve 6, wherein an outlet of the first particle filter 4 is connected with an inlet of the limiting hole 3, an outlet of the limiting hole 3 is connected with an outer wall input end of the membrane permeation type dryer 1, an outer wall output end of the membrane permeation type dryer 1 is connected with the first pump 2, a permeable membrane outlet of the membrane permeation type dryer 1 is connected with the three-way valve 6, and the first temperature and humidity sensor 5 is arranged on a pipeline connected with the three-way valve 6 through which a permeable membrane outlet of the membrane permeation type dryer 1 is connected;
the air humidity control system comprises a three-way valve 6, a membrane permeation type gas-gas humidifier 8, a second pump 9, a second particle filter 10, a water tank 11, a water heater 12, a water temperature sensor 13, a water tank temperature controller 14 and a second temperature and humidity sensor 15, wherein the outlet of the three-way valve 6 is connected with the sample gas inlet of the membrane permeation type gas-gas humidifier 8, the sample gas outlet of the membrane permeation type gas-gas humidifier 8 is connected with the gas inlet of a second aerosol scattering coefficient measurement system 16, the gas inlet of the second pump 9 is connected with the sheath gas outlet of the membrane permeation type gas-gas humidifier 8, the sheath gas inlet of the membrane permeation type gas-gas humidifier 8 is connected with the moisture gas outlet of the water tank 11, air is connected with the gas inlet of the water tank 11 through the second particle filter 10, and the water heater 12 and the water temperature sensor 13 in the water tank 11 are arranged under the liquid level and are connected with the water tank temperature controller 14;
the data acquisition processing system comprises a data acquisition card and data monitoring software which are electrically connected; the first temperature and humidity sensor 5, the second temperature and humidity sensor 15, the water body temperature sensor 13 and the water tank temperature controller 14 are electrically connected with the data acquisition card;
the three-way valve 6 of the sample gas outlet of the drying system is connected to the gas inlet of the first aerosol scattering coefficient measuring system 7 and is used for measuring the scattering coefficient of the dried aerosol; the sample gas outlet of the air humidity control system is connected with the second temperature and humidity sensor 15, and the sample gas subjected to humidity control enters the air inlet of the second aerosol scattering coefficient measuring system 16 and is used for measuring the scattering coefficient of the humidified aerosol.
In addition, the invention also provides an aerosol scattering coefficient hygroscopic growth measuring method, which is used for measuring the scattering hygroscopic growth capacity of the atmospheric aerosol particles by using the aerosol scattering coefficient hygroscopic growth measuring instrument.
The aerosol scattering coefficient hygroscopic growth measuring instrument of the invention obtains the following three measuring elements: 1. a dry aerosol scattering coefficient characterizing the aerosol scattering coefficient at a relative humidity below 30%. 2. A moisture sol scattering coefficient that characterizes the aerosol scattering coefficient at a relative humidity of 30% -90%. 3. The aerosol scattering coefficient absorbs moisture by a growth factor f (RH), which is the ratio of the wet aerosol to dry aerosol scattering coefficients.
Application example 1
Aerosol scattering coefficient hygroscopic growth measurement
The value of the increase in the moisture absorption of the aerosol scattering coefficient is expressed by the ratio of the scattering coefficients measured by the two aerosol scattering coefficient measuring instruments, the second aerosol scattering coefficient measuring system 16 measures the aerosol scattering coefficient (two flow cycles are run) that the aerosol humidity is increased from 30% to 90% and then decreased from 90% to below 30%, and the first aerosol scattering coefficient measuring system 7 measures the scattering coefficient that the aerosol humidity is below 30%. The ratio of the two is:
f(RH)＝σ Ref /σ Wet
wherein f (RH) is the aerosol scattering coefficient hygroscopic growth factor, sigma Ref Scattering coefficient, sigma, measured for dry gas aerosol Wet Scattering coefficients measured for aerosols at different humidities. In a cyclic process<1.5 hours) the measured physicochemical properties of the atmospheric aerosol do not change much, f (RH) can be considered as the hygroscopic growth factor of the aerosol scattering coefficient.
Application example 2
Data quality control
The aerosol scattering coefficient hygroscopic growth factor f (RH) is obtained from data measured in parallel by the first aerosol scattering coefficient measurement system 7 and the second aerosol scattering coefficient measurement system 16. Then, measurement errors, calibration errors and shunt errors (differences in distribution, concentration, composition and the like of air flowing into the two scattering coefficient measuring instruments from the sampling port) of the two scattering coefficient measuring instruments will interfere with the measurement results, so that the influence of the factors is eliminated when the data are processed.
Therefore, when the air humidification system is not humidified, the correction is performed by the following method, and the aerosol measured by the second aerosol scattering coefficient measurement system 16 is in a dry state (humidity is lower than 30%), and at this time, the aerosol measured by the first aerosol scattering coefficient measurement system 7 is also in a dry state (humidity is lower than 30%), and at this time, if the ratio of the data measured by the two aerosol scattering coefficient measurement instruments is approximately 1, the systematic deviation of the two measurement instruments is considered to be substantially 0.
Application example 3
The atmospheric sample of a residential district in Guangzhou city is taken and measured, and the results are shown in fig. 3, 4 and 5.
In the aerosol scattering coefficient hygroscopic growth measuring instrument, the scattering coefficient value measured by the first turbidity meter is an ordinate axis, the scattering coefficient value measured by the second turbidity meter is an abscissa axis, and the measurement errors of the two turbidity meters can be compared when the air humidity control modulation humidity is lower than 30%. The change curve of the scattering moisture absorption growth factor f (RH) with humidity, which is obtained by dividing the measured value of the scattering coefficient of the second nephelometer by the measured value of the scattering coefficient of the first nephelometer, is shown in fig. 4 in the process of modulating the humidity of the measured atmosphere by the air humidity control system. The change curve of f (RH) with humidity during the humidity modulation from 30% to 90% is shown in FIG. 5.
The above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims (3)
1. The aerosol scattering coefficient moisture absorption growth measuring instrument is characterized by comprising a drying system, an air humidity control system, a data acquisition processing system and an aerosol scattering coefficient measuring system, wherein:
the drying system comprises a dryer (1), a first pump (2), a limiting hole (3), a first particle filter (4), a first temperature and humidity sensor (5) and a three-way valve (6), wherein an outlet of the first particle filter (4) is connected with an inlet of the limiting hole (3), an outlet of the limiting hole (3) is connected with an outer wall input end of the dryer (1), an outer wall output end of the dryer (1) is connected with the first pump (2), a permeable membrane outlet of the dryer (1) is connected with the three-way valve (6), and the first temperature and humidity sensor (5) is arranged on a pipeline connected with the permeable membrane outlet of the dryer (1) and the three-way valve (6);
the air humidity control system comprises a three-way valve (6), a membrane permeation type air-air humidifier (8), a second pump (9), a second particle filter (10), a water tank (11), a water heater (12), a water temperature sensor (13), a water tank temperature controller (14) and a second temperature and humidity sensor (15), wherein an outlet of the three-way valve (6) is connected with a sample air inlet of the membrane permeation type air-air humidifier (8), a sample air outlet of the membrane permeation type air-air humidifier (8) is connected with an air inlet of a second aerosol scattering coefficient measuring system (16), an air inlet of the second pump (9) is connected with a sheath air outlet of the membrane permeation type air-air humidifier (8), a sheath air inlet of the membrane permeation type air-air humidifier (8) is connected with a moisture air outlet of the water tank (11), air is connected with an air inlet of the water tank (11) through the second particle filter (10), and the water heater (12) and the water temperature sensor (13) in the water tank (11) are arranged below the liquid level and are connected with the water tank temperature controller (14);
the data acquisition processing system comprises a data acquisition card and data monitoring software which are electrically connected; the first temperature and humidity sensor (5), the second temperature and humidity sensor (15), the water body temperature sensor (13) and the water tank temperature controller (14) are electrically connected with the data acquisition card;
a three-way valve (6) of a sample gas outlet of the drying system is connected to a gas inlet of a first aerosol scattering coefficient measuring system (7) and is used for measuring the scattering coefficient of the dried aerosol; the sample gas outlet of the air humidity control system is connected with a second temperature and humidity sensor (15), and the sample gas subjected to humidity control enters the air inlet of a second aerosol scattering coefficient measurement system (16) and is used for measuring the scattering coefficient of the humidified aerosol.
2. Aerosol-scattering coefficient hygroscopic growth meter according to claim 1, characterized in that the dryer (1) is a membrane-permeable dryer.
3. An aerosol scattering coefficient hygroscopic growth measuring method, characterized in that the aerosol scattering coefficient hygroscopic growth measuring instrument according to claim 1 is used for measuring the size of the scattering hygroscopic growth capacity of the aerosol particles.
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| EP3605059A1 (en) * | 2018-07-31 | 2020-02-05 | Koninklijke Philips N.V. | Particle sensor and sensing method |
| CN109632611A (en) * | 2019-01-14 | 2019-04-16 | 浙江大学 | A kind of particulate matter moisture absorption simulator |
| CN111122392B (en) * | 2019-12-04 | 2021-01-26 | 北京航空航天大学 | Aerosol moisture absorption characteristic comprehensive measurement instrument |
| CN111208043A (en) * | 2020-01-16 | 2020-05-29 | 中国科学院合肥物质科学研究院 | System and method for synchronously measuring moisture absorption growth factors of multiple optical parameters of aerosol |
| CN114295524B (en) * | 2021-12-31 | 2023-10-27 | 暨南大学 | Device and method for measuring aerosol hygroscopicity of multi-phase relative humidity and non-drying system |
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