Method for diluting and sampling particulate matters in flowing gas

The invention relates to the technical field of sampling devices, and provides a flowing gas particulate matter dilution sampling method which comprises the following steps: selecting a sampling mode by adopting a constant-flow constant-dilution-ratio sampling mode or a constant-speed constant-dilution-ratio sampling mode; the flow of a sample gas path is adjusted according to a set sample gas standard condition flow value, so that the sample gas enters the diluting and mixing cabin and then enters the staying cabin; the measurement control system collects sample gas flow, pressure and temperature signals, and converts a sample gas working condition flow value into a standard condition flow value; the gas flow of the bypass is adjusted, so that the standard condition flow value of the sample gas is equal to the determined flow value; the flow sensor is arranged in the sample gas path, the flow value of the sample gas can be conveniently and accurately measured in real time, the gas exhaust power is arranged i