Diluter, analysis system, and analysis method

Abstract

The objective of the present invention is to uniformly dilute particulate matter contained in a sample gas. A diluter (3, 3', 3") is provided with an inflow portion (31), a mixing portion (32, 32"), a discharge portion (35), a connecting portion (33), and an introducing portion (34). The inflow portion (31) allows a sample gas (SG) to flow in. The mixing portion (32, 32") has an inner diameter that is greater than the inner diameter of the inflow portion (31), and mixes the sample gas (SG) and a dilution gas (AR) to generate a diluted sample gas (DG). The discharge portion (35) discharges the diluted sample gas (DG). The connecting portion (33) includes a first tapered part (33a) having an inner diameter which increases from the side connected to the inflow portion (31) toward the side connected to the mixing portion (32, 32"). The introducing portion (34) introduces the dilution gas (AR) into an internal space (IS1) from a position downstream of the position at which the first tapered part (33a) is connected to the inflow portion (31).