Virtual impactor as an accessory to optical particle counters

Jorma Keskinen, Kauko Janka, Matti Lehtimäki

Research output: Contribution to journalArticleScientificpeer-review

16 Citations (Scopus)

Abstract

A method to improve the sensitivity of optical particle counters for large particles is presented. The basic idea is to increase the concentration in the sample air by connecting a virtual impactor to the sample inlet of an optical particle counter. For particles with D p > 3 μm, the number concentration is increased by a factor of 20. The improvement in statistical accuracy is particularly useful in Alter testing and clean room measurements. The differences in the size distributions measured with and without the virtual impactor are used in estimating the relationship between the aerodynamic and optical sizes of different aerosols.
Original languageEnglish
Pages (from-to)79-83
JournalAerosol Science and Technology
Volume6
Issue number1
DOIs
Publication statusPublished - 1987
MoE publication typeA1 Journal article-refereed

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Radiation counters
Accessories
Clean rooms
Aerosols
Aerodynamics
Testing
Air
aerodynamics
aerosol
impactor
particle
air

Cite this

Keskinen, Jorma ; Janka, Kauko ; Lehtimäki, Matti. / Virtual impactor as an accessory to optical particle counters. In: Aerosol Science and Technology. 1987 ; Vol. 6, No. 1. pp. 79-83.
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Virtual impactor as an accessory to optical particle counters. / Keskinen, Jorma; Janka, Kauko; Lehtimäki, Matti.

In: Aerosol Science and Technology, Vol. 6, No. 1, 1987, p. 79-83.

Research output: Contribution to journalArticleScientificpeer-review

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AU - Keskinen, Jorma

AU - Janka, Kauko

AU - Lehtimäki, Matti

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N2 - A method to improve the sensitivity of optical particle counters for large particles is presented. The basic idea is to increase the concentration in the sample air by connecting a virtual impactor to the sample inlet of an optical particle counter. For particles with D p > 3 μm, the number concentration is increased by a factor of 20. The improvement in statistical accuracy is particularly useful in Alter testing and clean room measurements. The differences in the size distributions measured with and without the virtual impactor are used in estimating the relationship between the aerodynamic and optical sizes of different aerosols.

AB - A method to improve the sensitivity of optical particle counters for large particles is presented. The basic idea is to increase the concentration in the sample air by connecting a virtual impactor to the sample inlet of an optical particle counter. For particles with D p > 3 μm, the number concentration is increased by a factor of 20. The improvement in statistical accuracy is particularly useful in Alter testing and clean room measurements. The differences in the size distributions measured with and without the virtual impactor are used in estimating the relationship between the aerodynamic and optical sizes of different aerosols.

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DO - 10.1080/02786828708959122

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JO - Aerosol Science and Technology

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