| 摘要 |
A particulate sensor (1) which detects particulates (S) contained in a gas under measurement (EG) flowing within a gas flow pipe (EP) has a space forming portion (12) and an ion source (15). The space forming portion (12) projects into the gas flow pipe (EP) and forms an internal space (MX). The space forming portion (12) has an introduction port (43I) for introducing the gas under measurement (EG) into the internal space (MX) and a discharge port (480) for discharging from the internal space (MX) the gas (EGI) introduced through the introduction port (43I). The source (15) produces ions (CP) by gaseous discharge. The space forming portion (12) is configured such that, through utilization of a negative pressure produced in the discharge port (480) by the gas under measurement (EG) flowing within the gas flow pipe (EP), the introduced gas (EGI) is discharged from the internal space (MX) through the discharge port (480), the gas under measurement (EG) is introduced into the internal space (MX) through the introduction port (43I), and the introduced gas (EGI) is mixed with the ions (CP) produced by the ion source (15). |
