The Calibration Method of Time Resolved Laser Induced Incandescence Using Carbon Black Particles for the Soot Measurement at Exhaust Tail Pipe in Engine

The calibration technique of Time Resolved Laser Induced Incandescence was investigated both experimentally and numerically by using standard-sized carbon black particles for the instantaneous soot measurement at exhaust tail pipe in engine. The carbon black particles (19㎚, 25㎚, 45㎚ and 58㎚) used in this study are similar, though not identical, to soot particle generated from flame not only in morphology but also in micro-structure. The amount of soot loading in flow was controled by a diluted gas (nitrogen) and was measured by the gravimetric method at exhaust pipe in calibrator. The successful calibrations of primary particle size and soot mass fraction were carried out at the range from 19㎚ to 58㎚ and from 0.25㎎/㎥ to 37㎎/㎥ respectively. And based on these results the numerical simulation of LII signal was tuned and the effect of an exhaust temperature variation on the decay rate of LII signal was corrected.