Patent ID: 7723677

Claim:
A differential mobility analyzer, wherein a control volume (V c ) limited by sidewalls is defined and wherein at least there is: a main drag flow (v), a particle injection point or injection slot ( 1 ) through a side face (S 1 ), and a target particle upper exit slot ( 2 ) or linear detection sensor on an opposite face (S 2 ) characterized in that electrodes ( 3 ) are incorporated on the faces (S 1 , S 2 ) where each one of them has a potential gradient (∇V ) in the direction of the main flow (v) and between them a potential difference (U) such that electric field (E) in the inner volume (V i ) is oblique, with a transverse component (E y ) transverse to the main flow (v), in the direction taken from the side face (S 1 ) where the injection is carried out and oriented toward the opposite face (S 2 ), and another non-zero component (E x ) parallel and in the direction opposite to the main flow (v).