Performance evaluation of the HR-ELPI + inversion

Sampo Saari (Corresponding Author), Anssi Arffman, Juha Harra, Topi Rönkkö, Jorma Keskinen

Research output: Contribution to journalArticleScientificpeer-review

1 Citation (Scopus)

Abstract

Data inversion methods used in aerosol measurement instruments have significant influence on the resolution and quality of the result. A freshly launched new electrical low pressure impactor (ELPI) instrument version, high resolution ELPI+ (HR-ELPI+, Dekati Ltd.), uses an iterative inversion calculation method to improve particle size resolution, concentration, and data analysis quality. In this article, the performance of the HR-ELPI + is critically analyzed by simulations and experiments in laboratory and field conditions, and the results are compared with a conventional inversion data analysis method (cut-point diameter concept) and with common reference instruments (e.g., SMPS and EEPS). The results showed that the HR-ELPI + inversion has limited performance at the lower and upper limits of the instrument’s size range, and can suffer if the raw currents have signal dependent noise more than 50% or electric noise more than 1%. However, the HR-ELPI + clearly provide remarkably better resolution and quality with low oscillation risk compared to the conventional cut-point diameter concept of the ELPI. The HR-ELPI + also showed generally very similar size distributions and number concentrations compared to the reference instruments.

Original languageEnglish
Pages (from-to)1037-1047
Number of pages11
JournalAerosol Science and Technology
Volume52
Issue number9
DOIs
Publication statusPublished - 2 Sep 2018
MoE publication typeNot Eligible

Fingerprint

low pressure
data inversion
impactor
evaluation
inversion
Aerosols
range size
oscillation
Particle size
particle size
aerosol
simulation
experiment
Experiments

Keywords

  • Pramod Kulkarni

Cite this

Saari, S., Arffman, A., Harra, J., Rönkkö, T., & Keskinen, J. (2018). Performance evaluation of the HR-ELPI + inversion. Aerosol Science and Technology, 52(9), 1037-1047. https://doi.org/10.1080/02786826.2018.1500679
Saari, Sampo ; Arffman, Anssi ; Harra, Juha ; Rönkkö, Topi ; Keskinen, Jorma. / Performance evaluation of the HR-ELPI + inversion. In: Aerosol Science and Technology. 2018 ; Vol. 52, No. 9. pp. 1037-1047.
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Saari, S, Arffman, A, Harra, J, Rönkkö, T & Keskinen, J 2018, 'Performance evaluation of the HR-ELPI + inversion', Aerosol Science and Technology, vol. 52, no. 9, pp. 1037-1047. https://doi.org/10.1080/02786826.2018.1500679

Performance evaluation of the HR-ELPI + inversion. / Saari, Sampo (Corresponding Author); Arffman, Anssi; Harra, Juha; Rönkkö, Topi; Keskinen, Jorma.

In: Aerosol Science and Technology, Vol. 52, No. 9, 02.09.2018, p. 1037-1047.

Research output: Contribution to journalArticleScientificpeer-review

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T1 - Performance evaluation of the HR-ELPI + inversion

AU - Saari, Sampo

AU - Arffman, Anssi

AU - Harra, Juha

AU - Rönkkö, Topi

AU - Keskinen, Jorma

PY - 2018/9/2

Y1 - 2018/9/2

N2 - Data inversion methods used in aerosol measurement instruments have significant influence on the resolution and quality of the result. A freshly launched new electrical low pressure impactor (ELPI) instrument version, high resolution ELPI+ (HR-ELPI+, Dekati Ltd.), uses an iterative inversion calculation method to improve particle size resolution, concentration, and data analysis quality. In this article, the performance of the HR-ELPI + is critically analyzed by simulations and experiments in laboratory and field conditions, and the results are compared with a conventional inversion data analysis method (cut-point diameter concept) and with common reference instruments (e.g., SMPS and EEPS). The results showed that the HR-ELPI + inversion has limited performance at the lower and upper limits of the instrument’s size range, and can suffer if the raw currents have signal dependent noise more than 50% or electric noise more than 1%. However, the HR-ELPI + clearly provide remarkably better resolution and quality with low oscillation risk compared to the conventional cut-point diameter concept of the ELPI. The HR-ELPI + also showed generally very similar size distributions and number concentrations compared to the reference instruments.

AB - Data inversion methods used in aerosol measurement instruments have significant influence on the resolution and quality of the result. A freshly launched new electrical low pressure impactor (ELPI) instrument version, high resolution ELPI+ (HR-ELPI+, Dekati Ltd.), uses an iterative inversion calculation method to improve particle size resolution, concentration, and data analysis quality. In this article, the performance of the HR-ELPI + is critically analyzed by simulations and experiments in laboratory and field conditions, and the results are compared with a conventional inversion data analysis method (cut-point diameter concept) and with common reference instruments (e.g., SMPS and EEPS). The results showed that the HR-ELPI + inversion has limited performance at the lower and upper limits of the instrument’s size range, and can suffer if the raw currents have signal dependent noise more than 50% or electric noise more than 1%. However, the HR-ELPI + clearly provide remarkably better resolution and quality with low oscillation risk compared to the conventional cut-point diameter concept of the ELPI. The HR-ELPI + also showed generally very similar size distributions and number concentrations compared to the reference instruments.

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Saari S, Arffman A, Harra J, Rönkkö T, Keskinen J. Performance evaluation of the HR-ELPI + inversion. Aerosol Science and Technology. 2018 Sep 2;52(9):1037-1047. https://doi.org/10.1080/02786826.2018.1500679