Method and device for measuring pollutants contained in engine exhaust

A method for measuring pollutants contained in an exhaust stream at the outlet of an engine, comprising the following steps:

• positioning a probe so that a sampling orifice of said probe is placed on a sampling surface provided at the outlet of the engine in the exhaust stream, and sampling a section of the exhaust stream with said probe;
• activating an analysis unit coupled with the probe in order to carry out acquisition of characteristic data of the exhaust stream sampled by the probe;
• controlling a displacement of the probe in order to impart a continuous displacement of the sampling orifice along a specific trajectory on the sampling surface with constant surface sweeping per unit time, while continuing the sampling and the acquisition of characteristic data of the exhaust stream sampled by the probe, wherein the displacement of the probe is controlled for imparting the continuous displacement of the sampling orifice according to specific trajectories in circles covering the section of the exhaust stream, each circle taking the same amount of time to be swept by the sampling orifice but at different velocities;
• processing the data acquired by the analysis unit in order to measure the pollutants present in the exhaust stream.