Patent ID: 9638666
Date: 2017-05-02
CPC Classifications: G01N,H01J

Claim:
1. A differential mobility analyzer apparatus for analyzing a sample of aerosol particles or for separating and concentrating aerosol particles, the apparatus comprising: a housing serving as a conduit for the flow of aerosol particles, the housing defining a housing pathway for the flow of the particles along a longitudinal axis; an inlet providing the particles into the housing, the particles flowing longitudinally downstream; a first conduit located laterally interior of the housing, the first conduit defining a first pathway for the flow of the particles longitudinally downstream; a second conduit located laterally interior of the first conduit, the second conduit defining a second pathway for the flow of the particles longitudinally downstream; a first outer wall of the first conduit, the first outer wall separating the housing pathway from the first pathway wherein a voltage is applied to the first outer wall; and a first inner wall of the second conduit, the first inner wall separating the first pathway from the second pathway wherein a voltage is applied to the first inner wall; and a first block electrode that is electrically charged wherein the block electrode at least partially obstructs the second pathway.