| 摘要 |
PURPOSE:To measure exactly a fine particle movement by making a parallel luminous flux of a uniform intensity of illumination incident into a flame, converging again a transmitted parallel luminous flux, projecting it onto an observation surface through a diaphragm having a small diameter, shielding a burning light, and obtaining a shadowgraph. CONSTITUTION:A laser light irradiated from a light source 1 becomes a parallel luminous flux of a uniform intensity of illumination through a condenser lens 2, a pin hole 3 placed at its focal position, and a collimator lens 4, and is made incident to an observation area 6 through a mask 5. A parallel transmitted light whose transmission is partially obstructed by solid fine particles such as soot, etc. in a burning flame in a combustion chamber 7 is converged again by a collimator lens 9, and projected onto an observation surface through a mask 10 and a filter 11, and through a diaphragm 13 of a converging part of a transmitted light. In this case, when it is projected to the observation surface through the collimator lens 9, the light projected to the observation area 6 as a parallel luminous flux nearly all reaches the observation surface through the diaphragm 13, and on the other hand, as for a burning light, only a light being parallel to the parallel luminous flux passes through the diaphragm 13, a light in other direction does not pass through but is shielded in the circumference. Accordingly, it is possible to obtain a shadowgraph for measuring a fine particle movement by shielding a burning light of a flame. |
