Abstract
The flame reactors have been suitable to produce a large quantity of the TiO_2 fine particles with having the photo-catalytic ability. In attendant to the flame temperature, which decides the formation of the TiO_2 fine particles, the temperature measurement has been studied using laser speckle method. From the results, double flames are formed both for the diffusion combustion and the premixed combustion. Furthermore, the movement of speckle pattern, which means the change of temperature, decreases with the equivalence ratio for the diffusion combustion. On the other hand, the movement increases with the equivalence ratio for the premixed combustion.
