Patent ID: 6881246

Claim:
A collecting device for collecting particles suspended in a gas, comprising: separating means for separating the particles in the gas according to sizes thereof having an exit, said separating means being a mobility analysis device including a first charging device for charging the particles in the gas, a flow path for flowing the particles with charges by the first charging device, and a second charging device situated in the flow path for providing electric field in the flow path perpendicular to a flow direction so that when the particles with electric charges enter the flow path at a predetermined speed, the particles are separated by moving difference based on the sizes, and the particles with sizes only in a specific range corresponding to an electric field intensity are collected at the exit, a collecting container connected to the exit of the separating means for receiving the particles separated in the separating means, a discharge electrode disposed in the collecting container for generating single polar ions, said particles introduced into the collecting container being charged with the single polar ions, and a collecting electrode disposed in the collecting container for collecting the charged particles through a potential difference relative to the discharge electrode.