METHOD AND DEVICE FOR MEASURING THE CONCENTRATION OF SOOT PARTICLES IN AN EXHAUST GAS, IN PARTICULAR FROM AN INTERNAL COMBUSTION ENGINE

摘要

The present invention relates to a method and a sensor (1) for collecting soot in an exhaust stream from an internal combustion engine by means of a resistive type planar probe positioned in the gas stream and having at least one face provided with electrodes connected to an electronic device for measuring soot concentration in the gas stream. The gas stream upstream from the planar probe is deflected by means of a protection shield (3) completely covering the planar probe and having a single soot-collection window (5) arranged in a wall of the protection shield (3) that is situated downstream from the planar probe in the gas stream, in such a manner as to: protect the planar probe from a direct frontal impact of soot and any debris contained in the gas stream; and generate a turbulent flow and reduce the speed of the gas stream downstream from the planar probe so as to select soot particles as a function of their size.