Patent ID: 7536898

Claim:
An aerosol dilution system, comprising: an inlet conduit ( 32 ) connected to an aerosol source ( 100 ) having an initial particle concentration; a first flow path ( 34 ) connected to the inlet conduit ( 32 ), said first flow path having a high particle counter ( 62 ) positioned at an end thereof; a second flow path ( 36 ) connected to the inlet conduit ( 32 ), said second flow path branching to form a third flow path ( 38 ) and a fourth flow path ( 40 ), said third and said fourth flow paths meeting at a junction ( 50 ); a flow restrictor ( 42 ) positioned in said third flow path ( 38 ), the initial particle concentration of said aerosol source ( 100 ) and an initial particle concentration received by said flow restrictor being identical; a filter ( 44 ) and a flow meter ( 46 ) connected in series in said fourth flow path, said filter ( 44 ) being in direct contact with said aerosol source; an outlet path ( 52 ) connected to said junction ( 50 ), and wherein a low particle counter ( 54 ), a second filter ( 56 ) and a second flow meter ( 58 ) are positioned in said outlet path.