Patent ID: 8387447
Filing Date: 2013-03-05
Classification: G01N

Abstract:
1. A particulate matter measurement device that is to measure a particulate matter contained in an exhaust gas emitted from an internal combustion engine and that comprises a first unit arranged near an exhaust gas pipe of the internal combustion engine, a second unit arranged separately from the first unit and a connecting pipe arranged between the first unit and the second unit, wherein the first unit comprises a body that has an exhaust gas flow channel from one end of which the exhaust gas is introduced, an orifice part arranged in the exhaust gas flow channel, a pressure rising check valve that is connected to the exhaust gas flow channel and that prevents a rise of the pressure by letting a part of the exhaust gas escape by mechanically opening by the pressure at a time when the pressure in the exhaust gas flow channel becomes bigger than or equal to a certain amount, and a dilution gas flow channel that is connected to a downstream side of the orifice part in the exhaust gas flow channel and that introduces the dilution gas into the exhaust gas flow channel, and that is so arranged to derive the diluted exhaust gas as being the exhaust gas diluted by the dilution gas from the other end of the exhaust gas flow channel, the second unit comprises a particulate matter measurement mechanism that introduces the diluted exhaust gas derived from the first unit through the connecting pipe and that measures the particulate matter contained in the introduced diluted exhaust gas.