CN101825553A - Collection and detection method for medium-tar-concentration cigarette sidestream smoke aerosol - Google Patents
Collection and detection method for medium-tar-concentration cigarette sidestream smoke aerosol Download PDFInfo
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Abstract
The invention discloses a detection method for cigarette sidestream smoke aerosol, which is suitable for medium-tar-concentration cigarette sidestream smoke. The method comprises the following steps: the sidestream smoke of a cigarette sample is collected by a fishtail hood, is primarily diverted by an auxiliary suction source to form a sample stream 3 and is secondarily diverted by a diluter, and the inlet/outlet air amount of the diluter is regulated to realize quantitive diluting, thereby forming a sample stream 4 the flow rate of which is 10-40 L/min; and meanwhile, the sample stream 3 is regulated so as to regulate the auxiliary suction source, so that the environment air flow rate becomes 200+/-30 mm/s, thereby meeting the effective detection range of the aerosol detector and requirements of cigarette sample detection for the environment air flow standard. Thus, the invention obtains a reliable detection result for the medium-tar-concentration cigarette sidestream smoke aerosol.
Description
Technical field
The invention belongs to cigarette smoke detection technique field, be specifically related to the detection method of aerosol granularity distribution situation in a kind of cigarette side-stream smoke, its cigarette product that is suitable for is the cigarette that tar content 5～15mg/ props up.
Background technology
Cigarette side-stream smoke is meant that it is one of important channel of generation " second-hand-cigarette ", is the rough burning of cigarette material and the product of cracking except propping up the flue gas that any other position penetrates from all of sucking the flue gas that end flows out from cigarette.Discharge a large amount of side-stream smokes during cigarette burning, the healthy material of a lot of harm people is wherein arranged, as nicotine, aldehyde material etc., and the content of different chemical component on the different-grain diameter aerosol particle has difference, and the difference of part component is very huge especially.In addition, though the metallic element boiling point is very high, burn and suck in the process at cigarette, the metallic element in the tobacco can eject by the cell explosion, as condensation core by other volatile components be wrapped to form aerosol particle, thereby enter main flume and side-stream smoke thereafter.Researchs such as JENKINS are thought for whole particles of size between the 0.1 and 0.2 μ m, and sodium, potassium, chlorine, bromine may also have manganese all to exist with same proportion of composing, and for the particulate greater than 0.5 μ m, the component of smoke particles is relevant with its size.In addition, the precipitation of the varigrained gasoloid of cigarette smoke on respiratory tract has certain difference.
Variant just because of chemical composition content on the different grain size aerosol particle with the deposition rule, therefore can use or product design technology by cigarette material, regulate and control flue gas aerosol size-grade distribution situation, thereby realize the reducing tar and reducing harm of cigarette.But this at first will realize the exploitation of flue gas aerosol size-grade distribution detection method and different-grain diameter aerosol particle capture method.Therefore, to the detection of side-stream smoke, having great significance aspect the research reduction harmful ingredients in flue gas.On the other hand, the chemical constitution of side-stream smoke and the comparison of main flume though see on qualitative basic identically, there are differences on quantitatively; Simultaneously, there is notable difference especially in the aerocolloidal size-grade distribution situation of main flume and side-stream smoke.So main flume gasoloid and side-stream smoke gasoloid must detect respectively.Therefore, the detection of gasoloid particle diameter distribution is the key of research cigarette side-stream smoke.
According to the bioassay standard of T/N in the YC/T 185-2004 cigarette side-stream smoke, can adopt fish tail cover collection side-stream smoke and carry out the mensuration calculating of TPM in the side-stream smoke.Described standard is applicable to mensuration and the follow-up nicotine and the mensuration of tar of TPM in the cigarette side-stream smoke.But there is the major technique defective of following two aspects in this standard: (1) this standard adopts the conventional analysis smoking machine, presses GB/T 16450 smoking cigarettes, but does not adopt relevant cigarette to prop up the regulation of surrounding environment wind speed control.And GB/T 16450 and GB/T 16447-2004 have stipulated clearly that mensuration side-stream smoke TPM ambient windstream is necessary for 170～230mm/s; (2) this standard can only detect the gross mass of aerosol particle in the side-stream smoke, reach chemical composition content such as measuring nicotine total in all particles, neophytadiene, can not measure the mass distribution ratio of different-grain diameter aerosol particle, and number of particles distribution situation and the average particulate diameter of measuring different-grain diameter gasoloid, the classification that more can not carry out the different-grain diameter aerosol particle captures.
The applicant discloses the aerocolloidal detection method of a kind of cigarette gas in application number is 2007100327475 patented claim, utilize existingly to be used for detecting the aerocolloidal detecting device of air and to detect cigarette flue gas aerosol.The process that existing aerosoloscope is measured aerosol granularity distribution situation in the air is: by the suction source device of detecting device itself, usually regime flow is 10L/min～40L/min, outwards the intake-gas sample enters analyser, detects by electronics low pressure ram.Described application can be used the existing aerocolloidal detecting device in the air that detects by the detection flue gas being carried out certain extension rate.
But above-mentioned application can only be applied to the mensuration of cigarette mainstream flue gas.The detection of side-stream smoke exists significantly different technical requirement, topmost comprising: the requirement difference of (1) foregoing ambient windstream with the detection of main flume; (2) contained granule phase substance concentration is significantly different; if directly measure the side-stream smoke sample with the mode of surveying main flume; the sensitivity that detects will decline to a great extent; thereby the accuracy that influence detects; and influence the efficient that the classification of different-grain diameter aerosol particle captures, thereby influence the qualitative analysis and the detection by quantitative of next step different-grain diameter aerosol particle chemical composition.
When adopting existing aerosoloscope to measure cigarette side-stream smoke, because aerosoloscope is restricted to the sample gas flow in testing process, and can't reach the requirement of cigarette smoke examination criteria, make the side-stream smoke situation and the situation under the standard conditions that record variant.Simultaneously, though though the aerosol concentration in the side-stream smoke is far below the aerocolloidal concentration of main flume, but still several times ground is higher than airborne situation, cause detecting device seriously to transship, as shown in Figure 1, occur testing result near or exceed the instrument detecting upper limit (4.0 * 105fA), test sample stream be during for 10L/min or 40L/min, the ambient windstream flow velocity is respectively near 90mm/s and the 35mm/s, departs from requirement 170～230mm/s; And adopt application number is that 2007100327475 the disclosed assay method of patented claim is when measuring side-stream smoke, the axial diluter that perhaps adopts aerosoloscope producer to provide carries out carrying out the gasoloid detection again after the cigarette smoke dilution, can reach the valid analysing range of aerosoloscope, but the ambient windstream speed that cigarette sample detects far below the standard-required scope of 200 ± 30mm/s, is distinguished near 10mm/s or the 40mm/s equally.Bring the incredible problem of testing result to detection.
On the other hand, even only at the cigarette side-stream smoke analysis, because the cigarette sample of different tar contents, the side-stream smoke aerosol particle concentration of its generation also has very big-difference.Therefore, cigarette for different tar contents, its dilution before entering detecting device requires also can be variant: for the cigarette sample of high tar content, must adopt higher extension rate, otherwise aerosoloscope internal classification stream pipeline will occur is sticked, stops up by aerosol particle gradually in testing process, make each cigarette repeated detection inconsequent as a result, even a cigarette incongruous situation of size-grade distribution situation in the process of whole detection, many mouthfuls of suctions appears, have a strong impact on the testing result accuracy.And for the cigarette sample of low tar content, then only can pass through small diluted amount, otherwise concentration is crossed the low accuracy that will influence aerosol granularity distribution testing result, more seriously will influence the effective dose that the gasoloid sizing screening captures, provide enough sample sizes thereby can not detect for the chemical composition content that carries out a step.So, how (tar content is lower than 5mg/ and props up at low-coke tar cigarette, many 0.5mg/ that reach especially prop up), the characteristics of kinds of cigarettes such as regular-size cigarette (tar content 5～13mg/ props up), cigar and cigar type cigarette (tar be generally 20mg/ prop up more than), adopting the relevant detection scheme, also is the former problem that atmospheric environment producer's original scheme that detect, that condition is single cann't be solved that is useful on.Because the regular-size cigarette of medium tar content (5～13mg/ props up) is the most common cigarette,, sets up a cover and be fit to detect the aerocolloidal detection method of its side-stream smoke and become exigence how at the cigarette of medium tar-concentration.
How to make the analytic process of medium tar-concentration cigarette side-stream smoke meet the restrictive condition of cigarette smoke examination criteria; Realize that aerocolloidal effective dilution has not yet to see the correlation technique report to obtain the can be used for cigarette side-stream smoke aerosol sample that aerosoloscope is measured in the flue gas.
Summary of the invention
The objective of the invention is to overcome the defective of T/N bioassay standard in the deficiencies in the prior art and the cigarette side-stream smoke, a kind of (cigarette result of use the best that tar content 5～15mg/ propped up) cigarette side-stream smoke aerocolloidal detection method feasible to most of cigarette is provided, make analytic process meet the restrictive condition of cigarette smoke country examination criteria, and obtain can be used for the sample that aerosoloscope is measured at aerocolloidal definite dilution scheme in the side-stream smoke to the testing environment air-flow.
The objective of the invention is to be achieved through the following technical solutions:
A kind of collection and detecting method that is applicable to medium tar-concentration cigarette flow measurement flue gas aerosol is provided, comprises and collect flue gas, dilution flue gas and detect flue gas that concrete steps are as follows:
(1) cigarette sample produces side-stream smoke during the flue gas generating means aspirates, and employing lower end sectional dimension forms sample gas 1 for the fish tail cover of the wide 1.5 ~ 3cm of long 8 ~ 15cm compiles side-stream smoke;
(2) sample flow 1 is carried out first order shunting, be divided into two, one is sample flow 3, carry out second level shunting by diluter and form detection sample flow 4, diluter is provided with clean compressed air air intake opening and exhausr port, be connected with regulator, regulating sample flow 4 flow velocitys is 10～40L/min, regulates the flow of clean compressed air and the adjusting that the diluter extension rate is realized sample flow 3 flows;
Another is a sample flow 2, and the flow of regulating sample flow 2 by the mode of auxiliary suction source 1 shunting suction is 5～20L/min;
After determining the flow of sample flow 2 and sample flow 3, regulate the airshed of sample flow 1, making ambient windstream speed is 200 ± 30mm/s;
(3) sample flow 4 being carried out gasoloid detects and calculates.
Described flue gas generating means is the linear pattern smoking machine in single hole road or porous road, and operation is carried out according to existing standard.
The described fish tail cover of step (1) requires employing to adsorb glass making little, inner wall smooth.End cross-sectional area is the cover of " length * wide=2cm * 10cm=20cm2 " under the recommendation use fish tail cover.
The airshed of the described adjusting sample flow 1 of step (2) is to be achieved by the airshed of regulating sample flow 2.
Because the flow of sample flow 3 needs to regulate according to the job requirement of aerosoloscope and to the needs of sample concentration dilution, and the flow of sample flow 1 equals the flow sum of sample flow 2 and sample flow 3.So the flow of sample flow 1 is to flow 3 traffic demand per sample, by adjusting the airshed of sample flow 2, is controlled and regulates.
The present invention obtains by a large amount of Test Summaries, and the auxiliary suction source 1 of 2 suction flows is flowed in sampling, and its pumping power should be greater than " the cover sectional area * 25cm/s of fish tail cover " (reaching more than " the cover sectional area * 20cm/s of fish tail cover ") at least.By the flow velocity adjusting gear, the flow of control sample flow 2 is in the scope of " the cover sectional area * 25cm/s of fish tail cover "～" the cover sectional area * 15cm/s-167mL/s of fish tail cover ", in the scope of preferably " the cover sectional area * 23cm/s of fish tail cover "～" the cover sectional area * 20cm/s-100mL/s of fish tail cover ", thereby regulate the flow of sample flow 1.Target is to guarantee that by the flow of controlling sample flow 1 cigarette sample ambient windstream speed is 200 ± 30mm/s.Because the flow of sample flow 1 equals ambient windstream speed and multiply by fish tail cover sectional area, can measure ambient windstream speed by the anemoscope routine techniques, thereby learn and regulate and control cigarette sample ambient windstream speed.
The described diluter of step (2) can use axial diluter or Dekati Diluter.
Adopt diluter to regulate in the process of importing and exporting airshed and dilution ratio, the flow of sample flow 3 and the adjustable ratio of dilution joint, the flow of sample flow 4 then requires to set according to the job requirement of aerosoloscope, is generally 10～40L/min.
Adopt diluter to regulate in the process of importing and exporting airshed and dilution ratio, if adopt axial diluter, then dilution ratio be chosen to be 5: 1～30: 1; The dilution ratio of described Dekati Diluter diluter is chosen to be 5: 1～and 60: 1.Select which kind of diluter for use, need to select, to meet aerosoloscope detection sensitivity and the effectively requirement of detectability according to the side-stream smoke concentration of actual detected sample.When adopting Dekati Diluter diluter, side-stream smoke aerosol particle extension rate can not change because of the suction flow adjustment of aerosoloscope.Therefore, Dekati Diluter diluter carries out sample detection applicable to the different size aerosoloscope after finishing parameter setting, and does not need must adjust according to the task performance of aerosoloscope as axle phase dilution device.
In order to prevent that flue gas particle from entering suction source and polluting and stop up, guarantee the accuracy that detects, preferably before variable valve, establish the aerosol particle drip catcher as purification plant, and whenever make 1 to 2 sample and just change filter disc in the clarifier.
The described computing method of step (3) are that the software that the calculating by the aerosol particle size-grade distribution relies on aerosoloscope to carry carries out, and concrete formula is as follows:
Because the electric current that the charged particle continuous precipitation is produced is recorded by a hyperchannel electrometer, the pass of electric current and numbers of particles concentration is on each grade ram:
I＝PneQN
Wherein I is an electric current, and P is the ratio of particle by corona, and n is the electrically charged number of particle, and e is the elementary charge electric weight, and Q is the gasoloid flow, and N is a numbers of particles concentration.After the current signal of gathering carried out relevant treatment by software, size distribution, the surface area that can also be converted into particle distributed and the volume distributed median feature.
The invention has the beneficial effects as follows:
(1) the present invention is according to the detection requirement of GB/T 16450 and GB/T 16447-2004, utilizes existing aerosoloscope to realize detection to cigarette side-stream smoke aerosol granularity distribution situation.
(2) the present invention is by the accurate qualification of side-stream smoke trap conditions, dilution scheme, cigarette burns and sucks and meets the requirement of industry mensuration when guaranteeing to gather the side-stream smoke aerosol sample, and enter sample concentration in the detecting device in the valid analysing range of equipment, guarantee the feasibility and the accuracy that detect.
(3) detection method effect of the present invention is remarkable, can accurately analyze the cigarette side-stream smoke gasoloid situation of medium tar-concentration, satisfies the detection requirement of most cigarette, provides the important technology basis to effective control cigarette quality.
Description of drawings
The existing aerosoloscope of Fig. 1 directly detects the design sketch of cigarette side-stream smoke aerosol load
Fig. 2 embodiment of the invention 2 detects the gas circuit connection diagram
Fig. 3 embodiment of the invention 2 detects cigarette side-stream smoke gasoloid result
Fig. 4 embodiment of the invention 3 detects the gas circuit connection diagram
Fig. 5 embodiment of the invention 3 detects cigarette side-stream smoke gasoloid result
Embodiment
Below further specify technical scheme of the present invention by specific embodiment.
Choose cigarette sample and produce side-stream smoke, adopt existing aerosoloscope directly to connect the outlet of fish tail cover, directly measure the cigarette side-stream smoke aerosol load that traps by the fish tail cover without dilution through the smoking machine smoking cigarette.Suction power is come the suction source device of self-detector itself, and regime flow is 40L/min usually, outside intake-gas sample, but, cause detecting device seriously to transship owing to aerosol concentration in the flue gas is higher than airborne situation far away.Testing result occurs and exceed the instrument detecting upper limit (4.0 * 10
5FA), indifference between each detected value has all reached situations such as maximal value, and the result can't carry out check and analysis as shown in Figure 1.Simultaneously the ambient windstream speed that detects of cigarette sample departs from the standard-required scope of 200 ± 30mm/s, is (is the detecting device of 10L/min for detecting device self suction source, then environment to play flow velocity be near the 90mm/s) near the 350mm/s.
Detect the gas circuit connected mode as shown in Figure 2.
(1) cigarette sample produces side-stream smoke during flue gas generating means (smoking machine) aspirates, and employing lower end sectional dimension forms sample gas 1 for the fish tail cover of the wide 2cm of long 10cm compiles side-stream smoke; End cross-sectional area is 20cm under the fish tail cover
2
(2) sample flow 1 is carried out first order shunting, is divided into two, and one is sample flow 3, and sample flow 3 is carried out second level shunting by diluter and formed detection sample flow 4.
Diluter adopts axial diluter, and axially diluter is provided with the clean compressed air air intake opening, and the pressure regulator valve of clean compressed air flow regulation is set.
When sample flow 4 flow velocitys were decided to be 10L/min, regulating the clean compressed air flow was 7.5L/min, axially the diluter dilution ratio is 4: 1, realizes that sample flow 3 flows are 2.5L/min, realizes the dilution of 4 times of sample flow 3 aerosol concentrations.
Another shunts sample flow 2, and the flow of regulating sample flow 2 by the mode of auxiliary suction source 1 shunting suction is 21.5L/min, split ratio 9.6: 1;
Determine that sample flow 2 flows are that the flow of sample flow 1 was 24L/min after the flow of 21.5L/min, sample flow 3 was 2.5L/min, make ambient windstream speed be 200mm/s; And total extension rate is 38.4: 1.
(3) sample flow 4 being carried out gasoloid detects and calculates.
Testing result is seen accompanying drawing 3.By the result as can be known, the number of particles testing result (charge value) of each diameter aerosol particle is 1.0 * 10
4～9.5 * 10
4, (maximum of aerosoloscope detects and is limited to 4.0 * 10 for aerocolloidal valid analysing range
5), and sensitivity is also very high.The validity that shows testing result.
From this testing result, the aerosol granularity of side-stream smoke distributes obviously different (seeing the testing result accompanying drawing of 2007100327475 patents) with main flume, even in cigarette smoking interim, still have more aerosol particle to discharge; And when suction, the recruitment of the aerosol particle quantity of individual particles diameter is not fairly obvious yet.But on the whole, similar to the aerosol particle release conditions of main flume, exist one progressively to increase and stage downward trend in the end equally.
Other steps and operation are equal to embodiment 2, and different is step (2):
When sample flow 4 flow velocitys were decided to be 40L/min, regulating the clean compressed air flow was 38L/min, axially the diluter dilution ratio is 20: 1, realizes that sample flow 3 flows are 2L/min, realizes the dilution of 20 times of sample flow 3 aerosol concentrations.
Another shunts sample flow 2, and the flow of regulating sample flow 2 by the mode of auxiliary suction source 1 shunting suction is 22L/min, split ratio 12: 1;
Determine that sample flow 2 flows are that the flow of sample flow 1 was 24L/min after the flow of 22L/min, sample flow 3 was 2L/min, make ambient windstream speed be 200mm/s; And total extension rate is 240: 1.
Survey the gas circuit connected mode as shown in Figure 4.
(1) cigarette sample produces side-stream smoke during flue gas generating means (smoking machine) aspirates, and employing lower end sectional dimension forms sample gas 1 for the fish tail cover of the wide 2cm of long 10cm compiles side-stream smoke; End cross-sectional area is 20cm under the fish tail cover
2
(2) sample flow 1 is carried out first order shunting, is divided into two, and one is sample flow 3, and sample flow 3 is carried out second level shunting by diluter and formed detection sample flow 4.
Diluter adopts Dekati Diluter diluter, and Dekati Diluter diluter is provided with the clean compressed air air intake opening, and the pressure regulator valve of clean compressed air flow regulation is set,
When sample flow 4 flow velocitys were decided to be 10L/min, regulating the clean compressed air flow was that 37.0L/min, Dekati Diluter diluter dilution ratio are 8.7: 1, realized that sample flow 3 flows are 4.8L/min, realized the dilution of 8.7 times of sample flow 3 aerosol concentrations.Unnecessary gas will be drained by the waste pipe of diluter, and flow is 31.8L/min.
Another shunts sample flow 2, and the flow of regulating sample flow 2 by the mode of auxiliary suction source 1 shunting suction is 19.2L/min, split ratio 5.0: 1;
Determine that sample flow 2 flows are that the flow of sample flow 1 was 24L/min after the flow of 19.2L/min, sample flow 3 was 4.8L/min, make ambient windstream speed be 200mm/s; And total extension rate is 43.5: 1.
(3) sample flow 4 being carried out gasoloid detects and calculates.
Testing result is seen accompanying drawing 5.By the result as can be known, the number of particles testing result (charge value) of each diameter aerosol particle is 0.5 * 10
4～8.0 * 10
4, (maximum of aerosoloscope detects and is limited to 4.0 * 10 for aerocolloidal valid analysing range
5), and sensitivity is also very high.The validity that shows testing result.
Survey the gas circuit connected mode as shown in Figure 4.
(1) cigarette sample produces side-stream smoke during flue gas generating means (smoking machine) aspirates, and employing lower end sectional dimension forms sample gas 1 for the fish tail cover of the wide 2cm of long 10cm compiles side-stream smoke; End cross-sectional area is 20cm under the fish tail cover
2
(2) sample flow 1 is carried out first order shunting, is divided into two, and one is sample flow 3, and sample flow 3 is carried out second level shunting by diluter and formed detection sample flow 4.
Diluter adopts Dekati Diluter diluter, and Dekati Diluter diluter is provided with the clean compressed air air intake opening, and the pressure regulator valve of clean compressed air flow regulation is set,
When sample flow 4 flow velocitys were decided to be 40L/min, regulating the clean compressed air flow was that 37.0L/min, Dekati Diluter diluter dilution ratio are 8.7: 1, realized that sample flow 3 flows are 4.8L/min, realized the dilution of 8.7 times of sample flow 3 aerosol concentrations.Unnecessary gas will be drained by the waste pipe of diluter, and flow is 1.8L/min.
Another shunts sample flow 2, and the flow of regulating sample flow 2 by the mode of auxiliary suction source 1 shunting suction is 19.2L/min, split ratio 5.0: 1;
Determine that sample flow 2 flows are that the flow of sample flow 1 was 24L/min after the flow of 19.2L/min, sample flow 3 was 4.8L/min, make ambient windstream speed be 200mm/s; And total extension rate is 43.5: 1.Promptly for Dekati Diluter diluter, when one timing of clean compressed air flow, extension rate is certain, and charge flow rate is also certain.Therefore, split ratio is non-adjustable, and total extension rate also determines, and the influence that not changed by gasoloid sensors work usefulness, testing result can not change yet.
(3) sample flow 4 being carried out gasoloid detects and calculates.
Claims (5)
1. one kind is applicable to aerocolloidal collection of medium tar-concentration cigarette side-stream smoke and detecting method, may further comprise the steps:
(1) cigarette sample produces side-stream smoke during the flue gas generating means aspirates, and employing lower end sectional dimension forms sample gas 1 for the fish tail cover of the wide 1.5 ~ 3cm of long 8 ~ 15cm compiles side-stream smoke;
(2) sample flow 1 is carried out first order shunting, be divided into two, one is sample flow 3, carry out second level shunting by diluter and form detection sample flow 4, diluter is provided with air intake opening and the exhausr port that is connected with regulator, regulating sample flow 4 flow velocitys is 10～40L/min, regulates the flow of clean compressed air and the adjusting that the diluter extension rate is realized sample flow 3 flows;
Another is a sample flow 2, and the flow of regulating sample flow 2 by the mode of auxiliary suction source 1 shunting suction is 5～25L/min;
After determining the flow of sample flow 2 and sample flow 3, regulate the airshed of sample flow 1, making ambient windstream speed is 200 ± 30mm/s;
(3) sample flow 4 being carried out gasoloid detects and calculates.
2. collection and the detecting method that is applicable to medium tar-concentration cigarette flow measurement flue gas aerosol as claimed in claim 1 is characterized in that the described auxiliary suction source 1 of step (2), and its pumping power should be greater than " the cover sectional area * 25cm/s of fish tail cover ".
3. collection and the detecting method that is applicable to medium tar-concentration cigarette flow measurement flue gas aerosol as claimed in claim 1 is characterized in that the described diluter of step (2) is axial diluter or DekatiDiluter.
4. collection and the detecting method that is applicable to medium tar-concentration cigarette flow measurement flue gas aerosol as claimed in claim 1, the gas source that it is characterized in that the described air intake opening of step (2) is in clean compressed air.
5. collection and the detecting method that is applicable to medium tar-concentration cigarette flow measurement flue gas aerosol as claimed in claim 1 is characterized in that being applicable to that tar-concentration props up at 5mg/～detection of the cigarette flow measurement flue gas that 15mg/ props up.
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| CN103033411A (en) * | 2012-12-20 | 2013-04-10 | 中国人民解放军第三军医大学 | Smoke diluting device |
| CN103267309A (en) * | 2013-05-29 | 2013-08-28 | 广州正虹科技发展有限公司 | Oil smoke collection device |
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| US7363828B2 (en) * | 2005-08-25 | 2008-04-29 | Msp Corporation | Aerosol measurement by dilution and particle counting |
| CN101373176B (en) * | 2007-12-21 | 2012-09-05 | 广东中烟工业有限责任公司 | Method for detecting cigarette gas colloidal sol grain fineness distribution |
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| CN103033411A (en) * | 2012-12-20 | 2013-04-10 | 中国人民解放军第三军医大学 | Smoke diluting device |
| CN103267309A (en) * | 2013-05-29 | 2013-08-28 | 广州正虹科技发展有限公司 | Oil smoke collection device |
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| CN106596196A (en) * | 2016-12-15 | 2017-04-26 | 西安交通大学 | Elevation-type cigarette side-stream smoke aerosol rapid collecting hood and detection method thereof |
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| CN108931388A (en) * | 2018-05-28 | 2018-12-04 | 佛山市日日圣科技有限公司 | For detecting the test macro of air purifier |
| CN110531024A (en) * | 2019-08-02 | 2019-12-03 | 中国电子科技集团公司第四十一研究所 | A kind of cigarette test process ambient windstream regulation device |
| CN112858450A (en) * | 2021-01-18 | 2021-05-28 | 中国烟草总公司郑州烟草研究院 | Cigarette smoke online collecting and ionizing device and method |
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