Performance of condensation particle counters with three continuous-flow designs

Quant, F.R.; Caldow, Robert; Sem, Gilmore J.; Addison, Timothy

doi:10.1016/0021-8502(92)90435-x

Cited by 65 publications

(61 citation statements)

References 3 publications

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“…The scanning time of the DMA2 was around 15 min per size and the distributions of the four particle sizes were measured in an hour. The sample flow rate was 1 LPM and prior to the H-TDMA a neutraliser (Ni-63, (Quant et al, 1992). Mobility distributions measured with DMA2 were inverted using functions by Stolzenburg (1988).…”

Section: Hygroscopicity and Volatilitymentioning

confidence: 99%

Hygroscopicity and chemical composition of Antarctic sub-micrometre aerosol particles and observations of new particle formation

et al. 2010

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Abstract.The Antarctic near-coastal sub-micrometre aerosol particle features in summer were characterised based on measured data on aerosol hygroscopicity, size distributions, volatility and chemical ion and organic carbon mass concentrations. Hysplit model was used to calculate the history of the air masses to predict the particle origin. Additional measurements of meteorological parameters were utilised. The hygroscopic properties of particles mostly resembled those of marine aerosols. The measurements took place at 130 km from the Southern Ocean, which was the most significant factor affecting the particle properties. This is explained by the lack of additional sources on the continent of Antarctica. The Southern Ocean was thus a likely source of the particles and nucleating and condensing vapours. The particles were very hygroscopic (HGF 1.75 at 90 nm) and very volatile. Most of the sub-100 nm particle volume volatilised below 100 • C. Based on chemical data, particle hygroscopic and volatile properties were explained by a large fraction of non-neutralised sulphuric acid together with organic material. The hygroscopic growth factors assessed from chemical data were similar to measured. Hygroscopicity was higher in dry continental air masses compared with the moist marine air masses. This was explained by the aging of the marine organic species and lower methanesulphonic acid volume fraction together with the changes in the inorganic aerosol chemistry as the aerosol had travelled long time over the continental Antarctica. Special focus wasCorrespondence to: E. Asmi (eija.asmi@fmi.fi) directed in detailed examination of the observed new particle formation events. Indications of the preference of negative over positive ions in nucleation could be detected. However, in a detailed case study, the neutral particles dominated the particle formation process. Freshly nucleated particles had the smallest hygroscopic growth factors, which increased subsequent to particle aging.

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Section: Hygroscopicity and Volatilitymentioning

confidence: 99%

Hygroscopicity and chemical composition of Antarctic sub-micrometre aerosol particles and observations of new particle formation

et al. 2010

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“…CNCs, and in particular the TSI 3010, are the most commonly used detectors for scanning DMA systems and will therefore be considered in detail here, although the analysis is readily extended to response delays of electrometers and other detectors. To probe the DTD, Quant et al (1992) introduced a step change in particle concentration into a number of different commercially available CNCs. The CNC output at 0.1 s intervals was then recorded to infer the deviation from the constant delay that would result from plug ow within the CNC.…”

Section: Accounting For Cnc Smearingmentioning

confidence: 99%

“…The data indicate that the CNC response approaches that of an exponential decay with a time constant of approximately 0.9 s as is shown in Figure 2b. If care is taken to minimize the length of tubing and the number of plumbing connections between the DMA outlet and detector inlet, the additional mixing introduced by Quant et al (1992) showing the response of the TSI 3010 to concentration step-changes and (b) the extent to which these data approach an exponential decay function. external plumbing is typically small relative to that within the detector.…”

Section: Accounting For Cnc Smearingmentioning

confidence: 99%

“…A more elaborate solution to this problem can also be performed in which a higher order, best t curve is found for the system transient response data such as that generated by Quant et al (1992). We have tted that data set to the functional form…”

Section: Accounting For Cnc Smearingmentioning

confidence: 99%

“…This method is appropriate here since the elements of the solution vector represent particle concentrations that cannot physically be negative. The two approaches to deconvoluting the transient response data from the step change measurements of Quant et al (1992) are compared in Figure 3. Ideally, the adjusted data will recover the form of the step change that was originally introduced into the CNC.…”

Section: Accounting For Cnc Smearingmentioning

confidence: 99%

See 2 more Smart Citations

Improved Inversion of Scanning DMA Data

Collins

Flagan

Seinfeld

2002

Aerosol Science and Technology

149

126

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Recovery of aerosol size distributions from either stepping or scanning mode differential mobility analyzer (DMA) measurements requires an accurate description of the characteristics of the DMA itself, as well as certain properties of the aerosol. Inversion of scanning DMA data is further complicated by the nonunique relationship between the time a particle exits the DMA and the time it is ultimately detected. Without an accurate description of this relationship, and an appropriate method of accounting for it, inverted distributions will be broadened and skewed relative to the true distribution. A simpli ed approach to inversion of scanning DMA data is described here in which adjustment of the raw data to account for the delay time distribution associated with the instrument is accomplished prior to nal inversion. This provides the exibility to utilize more accurate descriptions of the delay time distribution and the DMA transfer function than is feasible if the inversion is to be accomplished in one step as described by Russell et al. (1995). The accuracy of this procedure has been demonstrated through analysis of actual as well as test-case data.

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Electrical Mobility Methods for Submicrometer Particle Characterization

Flagan

2011

Aerosol Measurement

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Performance of condensation particle counters with three continuous-flow designs

Cited by 65 publications

References 3 publications

Hygroscopicity and chemical composition of Antarctic sub-micrometre aerosol particles and observations of new particle formation

Hygroscopicity and chemical composition of Antarctic sub-micrometre aerosol particles and observations of new particle formation

Improved Inversion of Scanning DMA Data

Electrical Mobility Methods for Submicrometer Particle Characterization

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