METHOD FOR MEASURING MASS CONCENTRATION OF PARTICULATE MATTER IN AIR

摘要

PROBLEM TO BE SOLVED: To provide a method for conveniently measuring a mass concentration of particulate matter dispersed in a measured space.;SOLUTION: A method for measuring a mass concentration of particulate matter in the air includes the steps of: obtaining a frequency change amount ▵F_A of an oscillator sensor caused by an air sample S containing particles and a gas component; obtaining a frequency change amount ▵F_B of the oscillator sensor caused by an air sample S₁ in which the gas component remains after removing the particles; obtaining a frequency change amount ▵F_C of the oscillator sensor caused by an air sample S₂ from which the particles and the gas component are removed; obtaining a frequency change amount ▵F=▵F_A-▵F_B-▵F_c of the oscillator sensor resulting from the particles; obtaining the mass M of the particles attached to the oscillator sensor from the ▵F on the basis of a known calibration curve; and calculating a mass concentration X of the particles contained in the air sample S from a number concentration N₁ of the particles in suction air of the air sample S of a cubic volume V₀ measured by a particle counter and a number concentration N₂ of the particles in exhaust air S₀' of the air sample S by applying X=M×{N₁/(N₁-N₂)}/V₀.;COPYRIGHT: (C)2015,JPO&INPIT