Patent ID: 7926332

Claim:
An exhaust gas analyzer that analyzes exhaust gas emitted from an internal combustion by irradiating the exhaust gas with laser light, comprising: an exhaust tube through which the exhaust gas is introduced; a light irradiation unit disposed in the exhaust tube that applies the laser light in a direction perpendicular to a direction of extension of the exhaust tube at a position of the exhaust tube where the light irradiation unit is disposed; a reflecting device configured to reflect the laser light a plurality of times such that reflected laser light generates Mie scattered light from particulate matter contained in the exhaust gas by irradiating the particulate matter with the reflected laser light; a transmitted light photoreceiving unit that receives the laser light that has passed through the exhaust gas; a scattered light photoreceiving unit that receives the generated Mie scattered light; and a calculation unit that calculates a concentration of a component in the exhaust gas based on photoreceiving data of a transmitted light intensity obtained from the transmitted light photoreceiving unit, and calculates a concentration of the particulate matter contained in the exhaust gas based on actual measurement data of a scattered light intensity obtained by the scattered light photoreceiving unit.