GAS SUBSTITUTION METHOD, GAS SUBSTITUTION DEVICE AND ANALYSIS SYSTEM

摘要

PROBLEM TO BE SOLVED: To provide a gas substitution method capable of contributing to easy and highly-accurate analysis of particles included in sample gas. SOLUTION: The sample gas G1 including the particles is fluidized in a gas passage 2c surrounded by a porous partition 2A. substitution gas G2 is fluidized in the reverse direction to the fluidizing direction of the sample gas G1 around the porous partition 2A, and the sample gas G1 is moved to the outside of the gas passage 2c through the porous partition 2A and the substitution gas G2 is moved to the inside of the gas passage 2c through the porous partition 2A, by diffusion caused by a partial pressure difference between the sample gas G1 and the substitution gas G2. The substitution gas G2 is allowed to flow out from an outlet 2b of the gas passage 2c together with the particles. Gas movement through the porous partition 2A caused by the inside/outside pressure difference of the gas passage 2c is prevented by the porous partition 2A. COPYRIGHT: (C)2006,JPO&NCIPI