Abstract
It examines relation between effect of except smoke and water spray. Water spray is a general firefighting equipment and install in a lot of places recently. The smoke sensor with good accuracy and heatproof was produced in this research. First of all, the water was sprinkled in the device with which smoked was filled and the smoke density was measured. The experimented had two cases that one case fixed the particle diameter, changed the flowing quantity and another case was opposite. Acquired data was calculated the least square method, and the smoke density was arranged. As a result, it is understood that the effect of water spray have related between flowing quantity and particle diameter.
