DEVICE FOR MEASURING PARTICLE CONCENTRATION

摘要

PROBLEM TO BE SOLVED: To provide a device for measuring particle concentration for an internal combustion engine capable of changing a passage distance in a liquid of inspection light with a simpler structure. SOLUTION: The device for measuring the particle concentration includes a light-illuminating section 120 for illuminating the inspection light towards a liquid stored in the internal combustion engine; a light-receiving section 130 for measuring a transmission light quantity of an inspection light quantity which passes through the liquid; and a changing section 140 with areas with different thicknesses in the illuminating direction of the inspection light, for changing a passage distance in the liquid of the inspection light by moving in the direction crossing to the illuminating direction. The particle concentration in the liquid is measured based on the transmission light quantities measured under different conditions in passage distance in the liquid, respectively. The movement of this changing section 140 is performed by engine vibrations transmitted to the changing section 140. COPYRIGHT: (C)2009,JPO&INPIT