Abstract

Particle mass concentrations in the exhaust streams of a variety of Diesel engines have been measured using both a visible wavelength opacity meter and an IR photoacoustic device. We present real-time recordings of the emissions from vehicles operated over the Federal Test Procedure driving cycle. Steady-state mass concentrations of a few mg · m−3 can be measured by opacity and as low as 0.4 mg · m−3 by the photoacoustic technique, but the uncertainty is ~15% in both cases. An uncertainty of ~20% is found in the estimation of total mass emission rates over the Federal Test Procedure cycle by integration of the optical signals.

© 1982 Optical Society of America

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