Portable sampling device for pollution source dilution tunnel particles

A portable sampling device for pollution source dilution tunnel particles comprises a sampling tube, a pitot tube, a heating device, a diluter, a gas sample pipeline, a particle cutter, a shunt, sampling filter membranes, a sucking pump, a circulation loop, a single chip microcomputer, a pipeline temperature sensor Ts, a pipeline pressure sensor Ps, a pitot tube differential pressure sensor delta P1, a temperature sensor Tg, flow sensors q, a flow sensor Qr, a keyboard, a display and a communication interface, wherein the sampling tube, the diluter, the gas sample pipeline, the particle cutter, the shunt, the sampling filter membranes, the flow sensors q, the flow sensor Qr and the sucking pump are connected in series sequentially. The equal-speed sampling of the gas sample and constant-current graded collection of particle sizes in the gas sample can be realized, and the discharge amount of the particles in specific particle size can be calculated according to the flow speed of the gas sample in the pipeline and the diameter of the pipeline.