Scanning mobility particle sizers SMPS

The values of the aggregate mobility diameters shown in Fig. 9 are values measured by the Scanning Mobility Particle Sizer (SMPS). The data are consistent with a scaling relation of the form ... 

A scanning mobility particle sizer (SMPS) was applied to analyze nanoparticles [2][4]. Size distributions and total number concentrations (TNC) of particles in the range from 0.01-0.7 pm are determined by analysis of particle mobility. An impactor with a cut-off size of 1 pm is used to withdraw the coarse particle fraction. Exhaust gas is taken with a probe, which is also fed with particle free air. The resulting dilution factor is adjusted by the flow rate of the diluting air and the total flow. To prevent condensation of water onto the particle surface, the dilution factor is chosen high enough, to achieve a dew point below ambient temperature. The analytical set-up is shown in Figure I. 

Next, the sampling flow was guided to different measurement instruments. The concentration number and the size distribution of submicron particles (0.01-0.5 pm) was obtained with a TSI Scanning Mobility Particle Sizer (SMPS) consisting of a differential electrical mobility analyzer coupled with a condensation nuclei counter. Previously a preconditioning gas system was used. This basically consists of a cyclon,... 

To this aim, the three configurations of residenhal heating devices whose combustion test results are presented in previous figures have been analyzed with respect to particle emissions two combustion heads equipped with premixed burners differentiated by metallic mat and perforated cylindrical heads and one equipped with a blue diffusive flame consisting in a five-tube injector where blue flames of gaseous hydrocarbons can be stabilized. The three flames have been characterized by in-situ optical diagnostics for the identification of the flame structures and the formation of particulate matter, whereas particle emission has been determined by scanning mobility particle sizer (SMPS) and spectroscopic characterization of sampled material. 

One potential method for measuring the size of aerosol nanoparticles is a scanning mobility particle sizer (SMPS), consisting of a differential mobility analyzer (DMA) and a condensation particle counter (CPC). Aerosol particles enter the DMA where they are charged using a radioactive source and their size is classified based on the electrical mobility, Z, of the particles in the applied electrical field ... 

Here, C is a constant and dy the volume equivalent diameter. Since 4n can be measured with instruments such as a differential mobility analyser (DMA) or scanning mobility particle sizer (SMPS) and dy can be estimated as a function of N (for a given d ) as described above, then Equation (9.3) can be used to estimate a fractal dimension based on the mass-mobility relationship with known values of Jp and N. The fractal dimension may be obtained from Equation (9.2) as the slope of log(Mp) versus log(fi ni)-An alternative method for estimating Df (for values of 2 or larger) can be derived using the results of Rogak et al. [57] and Schmidt-Ott [50]. For Df > 2.0 ... 

Note DMS differential mobility spectrometer, SMPS scanning mobility particle sizer, CPC condensation particle counter, TDMPS twin differential mobility particle sizer, DMPS differential mobility particle sizer, OPC optical particle counter, APS aerodynamic particle sizer, MAS mass aerosol spectrometer, LAS-X optical laser aerosol spectrometer, ELPI electrical low pressure impactor... 

Figure 15. Contom plot of monthly average particle number distributions measured in Atlanta, Georgia. SMPS = scanning mobility particle sizer, used to measure numbers of particles with Dp = 20-250 mn. A laser particle counter is employed to measure particles with diameters of 0.1-2 pm. Nanoparticles with Dp = 3-50 mn are measured with a nano-DMA in conjunction with a UCPC. The white boxes without data indicate times of eqipment failure. From Woo et al. (2001). Used by permission of Taylor Francis, Inc.

Filter collection efficiency was evaluated by comparing filter upstream and downstream particle concentrations measured by an SMPS (Scanning Mobility Particle Sizer) consisting of a long DMA (Differential Mobility Analyzer - Model 3080) and a U-CPC (Ultrafine Condensation Particle Counter - Model 3025). The cordierite wall-flow filters exhibited their well-known soot collection efficiency while the foam sample exhibited a lower collection efficiency. 

SMPS (scanning mobility particle sizer)—combines a DMA (differential mobility analyzer) and a CPC (condensation particle counter) to measure the... 

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