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Table 1 Particle measurement

From: Particulate emissions from diesel engines: correlation between engine technology and emissions

Method Measured variable Measured substance
Gravimetry Particulate mass Particles as per definition1)
Opacity Light absorption coefficient Soot
stray light Particle number Solid particle with suitable conditioning2)
Impaction Particle number and distribution in terms of aerodynamic diameter Solid particle with suitable conditioning2)
Differential analysis of mobility Particle number and distribution in terms of mobility diameter Solid particle with suitable conditioning2)
  1. 1)Exhaust gas components that are filtered at a maximum temperature of 52°C after dilution of the exhaust gases with filtered air in a hydrophobic filter material with inert properties against the exhaust gas components are defined as particles (EU 1970).
  2. 2)Removal of volatile components through thermodesorption or two-stage dilution (heated/unheated).