Correlation Studies of an In Line, Full-Flow Opacimeter

In-line, full-flow diesel smoke opacity meters have been developed to avoid the many installation and operational problems of using the EPA required end-of-line (open stack) PHS smokemeter. Extensive correlation tests were run to establish relationships between the in-line and PHS meters. These correlation studies included determining the effect of emitted light wave length on particle absorption, effective optical path length measurements and correlation studies with other (Bosch and Hartridge) meters.