Patent ID: 8106356

Claim:
A β-ray soot concentration direct-reading monitor, comprising: a soot collection unit including: a soot sampling gun, a filter paper, and a mechanical-control auto filter paper feeding structure, wherein said soot sampling gun includes a gathering tube, a Pitot tube and a sheath tube; and a soot mass detection unit including: a β-ray detecting means and a detected data processing means, wherein said β-ray detecting means includes a β-ray source and a β-ray receiving Geiger-Muller detector, and a soot sample is obtained by said soot collection unit and finally the soot data are obtained by said soot mass detection unit, wherein the gathering tube of said soot sampling gun is equipped with an upper cavity at an end thereof and a lower cavity corresponding to the upper cavity, said filter paper passes through gap between the upper cavity and lower cavity, a filter paper supporting grid is provided at the inlet of said lower cavity, a smoke outlet is equipped at a lower part of the lower cavity, wherein the sampling area of soot acquired from the upper cavity is at least twice of the actual testing area of filter paper so as to reduce the resistance of sampling and the mass of the soot acquired from sampling per area.