Sensor for measuring the concentration of particles in air

A sensor for measuring in real time the concentration of particles in air, the sensor comprising an inner channel having:

• a first portion comprising a side wall extending between a first open end and a second closed end, the first open end extending along an inlet plane;
• a second portion communicating with the first portion via a first opening in the side wall of the first portion, the first opening being adjacent to the first open end;
• a storage zone communicating with the first portion via a second opening in the side wall of the first portion, the second opening being adjacent to the second closed end;
• the first and second openings being arranged on either side of the side wall;
• a baffle plate fixed to a junction between the first open end of the first portion and the second portion, the baffle plate extending inside the first portion and forming with a first direction normal to the inlet plane an angle α such that:
• 0°<α<90°
• the baffle plate, the first portion and the first and second openings being dimensioned in such a way that in an air stream entering into the sensor through the first open end and comprising first particles of diameter less than or equal to 10 μm and second particles of diameter greater than 10 μm, the first particles are deflected by the baffle plate, pass through the first opening and arrive in the second portion of the inner channel whereas the second particles are deflected by the baffle plate impacted by a part of the side wall forming an impaction plate, pass through the second opening and arrive in the storage zone.