| 主权项 |
1. A particulate sensor having a detection section attached to a gas flow pipe and adapted to detect an amount of particulates contained in a gas under measurement flowing within the gas flow pipe, wherein
the detection section includes:
a space forming portion configured such that, in a state in which the particulate sensor is attached to the gas flow pipe, the space forming portion projects into the gas flow pipe and forms an internal space, the space forming portion having an introduction port for introducing the gas under measurement into the internal space and a discharge port for discharging from the internal space the gas introduced through the introduction port, andan ion source for producing ions by gaseous discharge; the detection section further includes a capturing electrode for capturing floating ions which are a portion of the ions and have not adhered to the particulates through mixing with the introduced gas, the space forming portion is configured such that, through utilization of a negative pressure produced in the discharge port by the gas under measurement flowing within the gas flow pipe, the introduced gas is discharged from the internal space through the discharge port, the gas under measurement is introduced into the internal space through the introduction port, and the introduced gas is mixed with the ions produced by the ion source, and the space forming portion forms the capturing electrode. |
