Exhaust gas concentration measuring device and exhaust gas concentration measuring method

摘要

PROBLEM TO BE SOLVED: To improve the measurement accuracy of gas concentration in exhaust gas.SOLUTION: An exhaust gas concentration measuring device 10 includes: an introduction pipe 11 for introducing part of exhaust gas G from an exhaust gas passage; a cyclone section 12 that is connected with the introduction pipe 11 for introducing the exhaust gas G, and rotates the exhaust gas G therein to separate foreign matters in the exhaust gas G from the exhaust gas G; a cell section 13 that is a cylindrical member and connected with the cyclone section 12 for introducing the exhaust gas G inside; a light source section 23 provided in the cell section 13; and a light-receiving section 25 that is provided in the cell section 13, receives light from the light source section 23, and measures the gas concentration of at least some of components of the exhaust gas G.SELECTED DRAWING: Figure 3