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

Table 1 Particle measurement

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⁾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⁾Removal of volatile components through thermodesorption or two-stage dilution (heated/unheated).

ISSN: 1745-6673