Electrical aerosol spectrometer of Tartu University

Tammet, Hannes; Mirme, A.; Tamm, E.

doi:10.1016/s0169-8095(02)00017-0

Cited by 131 publications

(68 citation statements)

References 7 publications

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“…The FMPS is based on electrical aerosol spectrometer technology (Tammet et al, 2002) and measures particle concentration at a maximum rate of 1 Hz in 32 size bins with a manufacturer specified range of 6 to 560 nm electrical mobility diameter. The FMPS at 33 m was housed in a temperature-controlled enclosure, to reduce instrument variability due to temperature changes.…”

Section: Instrumentationmentioning

confidence: 99%

Aerosol flux measurements above a mixed forest at Borden, Ontario

et al. 2011

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Abstract. Aerosol fluxes were measured above a mixed forest by Eddy Covariance (EC) with a Fast Mobility Particle Sizer (FMPS) at the Borden Forest Research Station in Ontario, Canada between 13 July and 12 August 2009. Chemically speciated flux measurements were made at a height of 29 m at the same location between 19 July and 2 August, 2006 using a Quadrupole Aerosol Mass Spectrometer (Q-AMS). The Q-AMS measured an average sulphate deposition velocity of 0.3 mm s −1 and an average nitrate deposition velocity of 4.8 mm s −1 . The FMPS, mounted at a height of 33 m (approximately 10 m above the canopy top) and housed in a temperature controlled enclosure, measured sizeresolved particle concentrations from 3 to 410 nm diameter at a rate of 1 Hz. For the size range 18 < D < 452 nm, 60 % of fluxes were upward. The exchange velocity was between −0.5 and 2.0 mm s −1 , with median values near 0.5 mm s −1 for all sizes between 22 and 310 nm. The size distribution of the apparent production rate of particles at 33 m peaked at a diameter of 75 nm. Results indicate a decoupling of the above and below canopy spaces, whereby particles are stored in the canopy space at night, and are then diluted with cleaner air above during the day.

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Section: Instrumentationmentioning

confidence: 99%

Aerosol flux measurements above a mixed forest at Borden, Ontario

et al. 2011

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“…For example, the TSI Scanning Mobility Particle Spectrometers (SMPS) employed here which use a combination of an Electrostatic Classifier (EC) to control the sample flow and neutralize charge on the particles (from a beta source), a Differential Mobility Analyzer (DMA) for particle size selection before 571 being passed to a Condensation Particle Counter (CPC) for counting. (ii) Particle detection using multiple, low-noise electrometers (Tammet et al 2002). For example, the TSI Fast Mobility Particle Sizer (FMPS) employed here.…”

Section: Introductionmentioning

confidence: 99%

A Laboratory Comparison of Real-Time Measurement Methods for 10–100-nm Particle Size Distributions

Hornsby

Pryor

2014

Aerosol Science and Technology

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We present information regarding the relative performance of five TSI particle sizing instruments when presented with several log-normally distributed particle populations that vary in terms of composition, concentration, and modal mean diameter (in the range of 10-100 nm) in a controlled laboratory environment. In experiments conducted with NaCl, NaNO 3 , and organic aerosols, across a total particle concentration suite ranging from approximately 1 × 10 4 cm −3 to 1 × 10 6 cm −3 , total number concentrations of sub-100-nm diameter particles from four SMPS systems and an FMPS all fall within ±50% of each other (and generally are within ±30%). However, larger discrepancies are evident in the particle size distribution, particularly for the NaCl particles, with an SMPS operated with a water-based CPC exhibiting large negative bias in modal peak concentrations relative to the isobutanol-based SMPS systems and the FMPS. Much closer agreement is found for NaNO 3 particles, although the SMPS systems tended to exhibit higher modal peak concentrations, and a slight shifting toward lower modal peak diameter than the FMPS.

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“…By recording the thermal energy absorbed from a light beam, either as an acoustic wave or incandescence, they are capable of high sensitivity and time resolution (Witze et al 2004), but solely to the black carbon component of exhaust PM. A more general capability for aerosol study is provided by the ELPI, which measures aerodynamic diameter, as well as the engine exhaust particle sizer (EEPS) and the differential mobility spectrometer (DMS500), which record electrical mobility diameter (both are similar to the electrical aerosol spectrometer (EAS; Tammet et al 1998). These instruments record timeresolved particle size distributions and are therefore capable of 69 indirectly providing PM mass.…”

Section: Introductionmentioning

confidence: 99%

Measuring Particulate Mass Emissions with the Electrical Low Pressure Impactor

Maricq

Chase

2006

Aerosol Science and Technology

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The electrical low pressure impactor (ELPI) is a useful tool for recording transient particle size distributions, such as in motor vehicle emissions. But for sub-micron aerosols, the straightforward mass weighting and integration of these size distributions overestimates the particulate matter (PM) mass by a factor of two or more. The present article examines the sources of this discrepancy and develops an analysis that allows quantitative PM mass measurement with an accuracy of about 20%. This procedure is applied to measure motor vehicle PM emissions, and the results are compared with filter-based gravimetric determinations. Good agreement is achieved for diesel and direct injection gasoline vehicles. For particulate trap equipped diesel vehicles and conventional gasoline vehicles, the PM mass recorded by the ELPI is often substantially lower than the filter based mass owing to the gaseous adsorption artifact of the latter. Accurate work at very low emissions levels, less than ∼1 mg/mi, requires further study of how reliably the ELPI can provide semivolatile nanoparticle mass as well as an improved understanding of filter-based vehicle exhaust measurement.

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Electrical aerosol spectrometer of Tartu University

Cited by 131 publications

References 7 publications

Aerosol flux measurements above a mixed forest at Borden, Ontario

Aerosol flux measurements above a mixed forest at Borden, Ontario

A Laboratory Comparison of Real-Time Measurement Methods for 10–100-nm Particle Size Distributions

Measuring Particulate Mass Emissions with the Electrical Low Pressure Impactor

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