エアロゾル研究
Online ISSN : 1881-543X
Print ISSN : 0912-2834
ISSN-L : 0912-2834
最新号
選択された号の論文の8件中1~8を表示しています
特集「大気エアロゾルに対して人間圏の活動変化が与えるインパクト—日本を取り巻く東アジアの例」
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技術論文
  • Muhammad Aiman Mohd Nor, Yoshihide Suwa
    2021 年 36 巻 2 号 p. 129-135
    発行日: 2021/06/20
    公開日: 2021/06/20
    ジャーナル フリー

    In the previous work, two types of installed filter leak tests described in ISO 14644-3; aerosol photometer method and light-scattering airborne particle counter (LSAPC) method, were examined by considering the difference in the characteristics of each measuring instrument. It was found that the same leak detection criterion (LDC) could be applied to filters above H14 grade in both test methods. Hence, the LDC of the aerosol photometer method could be applied in the LSAPC method for H14 or higher grade filters. However, LSAPCs have different optical, flow and electrical systems, resulting in different counting efficiency functions (CEFs). Furthermore, ISO 21501-4 allows LSAPCs to have a certain range of CEF. Therefore, it was necessary to ensure whether the same LDC could be applied in the installed filter leak test when applying different measuring instruments admitted by 21501-4. In this study, using theoretical calculation, the determination of threshold size, which makes the LDC unification possible between the two test methods, was further discussed, and penetrations detected by LSAPC with various CEFs were evaluated. It was concluded that 0.3 µm is the most suitable threshold size, and the same LDC studied in the previous work could be applied to the LSAPC with different CEFs.

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