METHOD AND DEVICE FOR MEASURING THE OPACITY LEVEL OF EXHAUST GASES FROM A DIESEL ENGINE

摘要

The invention relates to a method and a device for measuring the opacity level of exhaust gases from a diesel engine, wherein the method comprises using an opacimeter for collecting the exhaust gases, emitting a light beam through the collected gases, and acquiring a signal relative to the light intensity of the light beams that passed through the gases. The method further comprises extracting from the signal a first light intensity measurement during an engine acceleration phase, and extracting from the signal a second light intensity measurement during an engine idle phase. The two measurements are sufficiently close in time to provide equivalent measurement conditions. Finally, the method comprises deriving, from said measures and by a relative opacity calculation, the opacity level of the gases by calculating the gas absorption coefficient during the acceleration phase.