OFFLINE MEASUREMENT OF HONEYCOMB BODY FILTRATION EFFICIENCY

    公开(公告)号:US20230213433A1

    公开(公告)日:2023-07-06

    申请号:US18008510

    申请日:2020-07-08

    CPC classification number: G01N15/1434 G01N15/1404 G01N2015/1486

    Abstract: Apparatus and methods are disclosed which are capable of being used to determine filtration efficiency of a filter body even in a clean state. Methods of determining a filtration efficiency of a filter including forcing an inlet flow comprised of a gas (such as air) flow into the inlet end of the filter at a set flow rate, introducing particles such as smoke particles into the inlet flow, and optically counting the number of particles entering and exiting the filter during a sampling event, such as with diffraction based optical particle counters positioned upstream and downstream of the filter. Preferably the gas flow is a soot-free flow stream which does not load the honeycomb filter body with contaminants that need to be removed or burned out. The filter body can thus remain in an essentially clean state even after testing its filtration efficiency.

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