Abstract
LED is more convenient than laser because of its compactness and economical advantage if LED can be used as a light source to the light extinction method. However, whether LED can be an alternative to laser is not verified so far. In this study, soot volume fraction generated in the ethylene jet diffusion flame was measured by light extinction method using both laser and LED as a light source. As a result, the maximum value of the soot volume fraction measured by LED is smaller than that by laser. The peak position of soot generation measured by LED is closer to the center axis of the burner than that by laser.
