First comprehensive inter-comparison of aerosol electrometers for particles sizes up to 200 nm and concentration range 1000 cm-³ to 17 000 cm-³

Richard Högström, Paul Quincey, Dimitris Sarantaridis, Felix Lüönd, Andreas Nowak, Francesco Riccobono, Thomas Tuch, Hiromu Sakurai, Miles Own, Martti Heinonen, Jorma Keskinen, Jaakko Yli-Ojanperä

Research output: Contribution to journalArticleScientificpeer-review

11 Citations (Scopus)

Abstract

The concentration of nanometre-sized particles is frequently measured in terms of particle number concentration using well-established measuring instruments, e.g. condensation particle counters. Traceability for these measurements can be achieved by means of calibrations using an aerosol electrometer (AE) as a reference. A number of national metrology institutes (NMIs) and expert laboratories provide such calibrations, but the metrological basis is at present not well established because the equivalence between the unit realizations has not been investigated by means of an inter-laboratory comparison. This paper presents the results of the first comprehensive comparison of AEs involving NMIs and expert laboratories worldwide. The comparison covered the particle size and charge concentrations ranges 20 nm to 200 nm and 0.16 × 10-15 C cm-3 to 2.72 × 10-15 C cm-3 (equivalent to 1000 cm-3 to 17000 cm-3 singly charged particles), respectively. The obtained results agreed to within about ±3%, which was within stated uncertainties, with only a few exceptions, such as at low concentrations. Additional measurements with sub-20 nm particles show that comparisons in this size range are more challenging and require special considerations, though agreement to within about ±5% was still found with 6 nm particles. This comparison is the first and vital step towards internationally recognized SI traceability in particle number concentration measurements.
Original languageEnglish
Pages (from-to)293-303
Number of pages10
JournalMetrologia
Volume51
Issue number3
DOIs
Publication statusPublished - 2014
MoE publication typeA1 Journal article-refereed

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Electrometers
Aerosols
Particle size
Calibration
Radiation counters
Charged particles
Condensation

Keywords

  • aerosols
  • electrometers
  • particles
  • measurements
  • comparison

Cite this

Högström, Richard ; Quincey, Paul ; Sarantaridis, Dimitris ; Lüönd, Felix ; Nowak, Andreas ; Riccobono, Francesco ; Tuch, Thomas ; Sakurai, Hiromu ; Own, Miles ; Heinonen, Martti ; Keskinen, Jorma ; Yli-Ojanperä, Jaakko. / First comprehensive inter-comparison of aerosol electrometers for particles sizes up to 200 nm and concentration range 1000 cm-³ to 17 000 cm-³. In: Metrologia. 2014 ; Vol. 51, No. 3. pp. 293-303.
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abstract = "The concentration of nanometre-sized particles is frequently measured in terms of particle number concentration using well-established measuring instruments, e.g. condensation particle counters. Traceability for these measurements can be achieved by means of calibrations using an aerosol electrometer (AE) as a reference. A number of national metrology institutes (NMIs) and expert laboratories provide such calibrations, but the metrological basis is at present not well established because the equivalence between the unit realizations has not been investigated by means of an inter-laboratory comparison. This paper presents the results of the first comprehensive comparison of AEs involving NMIs and expert laboratories worldwide. The comparison covered the particle size and charge concentrations ranges 20 nm to 200 nm and 0.16 × 10-15 C cm-3 to 2.72 × 10-15 C cm-3 (equivalent to 1000 cm-3 to 17000 cm-3 singly charged particles), respectively. The obtained results agreed to within about ±3{\%}, which was within stated uncertainties, with only a few exceptions, such as at low concentrations. Additional measurements with sub-20 nm particles show that comparisons in this size range are more challenging and require special considerations, though agreement to within about ±5{\%} was still found with 6 nm particles. This comparison is the first and vital step towards internationally recognized SI traceability in particle number concentration measurements.",
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Högström, R, Quincey, P, Sarantaridis, D, Lüönd, F, Nowak, A, Riccobono, F, Tuch, T, Sakurai, H, Own, M, Heinonen, M, Keskinen, J & Yli-Ojanperä, J 2014, 'First comprehensive inter-comparison of aerosol electrometers for particles sizes up to 200 nm and concentration range 1000 cm-³ to 17 000 cm-³', Metrologia, vol. 51, no. 3, pp. 293-303. https://doi.org/10.1088/0026-1394/51/3/293

First comprehensive inter-comparison of aerosol electrometers for particles sizes up to 200 nm and concentration range 1000 cm-³ to 17 000 cm-³. / Högström, Richard; Quincey, Paul; Sarantaridis, Dimitris; Lüönd, Felix; Nowak, Andreas; Riccobono, Francesco; Tuch, Thomas; Sakurai, Hiromu; Own, Miles; Heinonen, Martti; Keskinen, Jorma; Yli-Ojanperä, Jaakko.

In: Metrologia, Vol. 51, No. 3, 2014, p. 293-303.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

T1 - First comprehensive inter-comparison of aerosol electrometers for particles sizes up to 200 nm and concentration range 1000 cm-³ to 17 000 cm-³

AU - Högström, Richard

AU - Quincey, Paul

AU - Sarantaridis, Dimitris

AU - Lüönd, Felix

AU - Nowak, Andreas

AU - Riccobono, Francesco

AU - Tuch, Thomas

AU - Sakurai, Hiromu

AU - Own, Miles

AU - Heinonen, Martti

AU - Keskinen, Jorma

AU - Yli-Ojanperä, Jaakko

PY - 2014

Y1 - 2014

N2 - The concentration of nanometre-sized particles is frequently measured in terms of particle number concentration using well-established measuring instruments, e.g. condensation particle counters. Traceability for these measurements can be achieved by means of calibrations using an aerosol electrometer (AE) as a reference. A number of national metrology institutes (NMIs) and expert laboratories provide such calibrations, but the metrological basis is at present not well established because the equivalence between the unit realizations has not been investigated by means of an inter-laboratory comparison. This paper presents the results of the first comprehensive comparison of AEs involving NMIs and expert laboratories worldwide. The comparison covered the particle size and charge concentrations ranges 20 nm to 200 nm and 0.16 × 10-15 C cm-3 to 2.72 × 10-15 C cm-3 (equivalent to 1000 cm-3 to 17000 cm-3 singly charged particles), respectively. The obtained results agreed to within about ±3%, which was within stated uncertainties, with only a few exceptions, such as at low concentrations. Additional measurements with sub-20 nm particles show that comparisons in this size range are more challenging and require special considerations, though agreement to within about ±5% was still found with 6 nm particles. This comparison is the first and vital step towards internationally recognized SI traceability in particle number concentration measurements.

AB - The concentration of nanometre-sized particles is frequently measured in terms of particle number concentration using well-established measuring instruments, e.g. condensation particle counters. Traceability for these measurements can be achieved by means of calibrations using an aerosol electrometer (AE) as a reference. A number of national metrology institutes (NMIs) and expert laboratories provide such calibrations, but the metrological basis is at present not well established because the equivalence between the unit realizations has not been investigated by means of an inter-laboratory comparison. This paper presents the results of the first comprehensive comparison of AEs involving NMIs and expert laboratories worldwide. The comparison covered the particle size and charge concentrations ranges 20 nm to 200 nm and 0.16 × 10-15 C cm-3 to 2.72 × 10-15 C cm-3 (equivalent to 1000 cm-3 to 17000 cm-3 singly charged particles), respectively. The obtained results agreed to within about ±3%, which was within stated uncertainties, with only a few exceptions, such as at low concentrations. Additional measurements with sub-20 nm particles show that comparisons in this size range are more challenging and require special considerations, though agreement to within about ±5% was still found with 6 nm particles. This comparison is the first and vital step towards internationally recognized SI traceability in particle number concentration measurements.

KW - aerosols

KW - electrometers

KW - particles

KW - measurements

KW - comparison

U2 - 10.1088/0026-1394/51/3/293

DO - 10.1088/0026-1394/51/3/293

M3 - Article

VL - 51

SP - 293

EP - 303

JO - Metrologia

JF - Metrologia

SN - 0026-1394

IS - 3

ER -