抄録
The speckle photography technique is one of the novelest velocity measurement methods. This study examines the possibility that this technique will become practically applicable. In this study this technique is applied to the laminar-free convection field around an uniformly heated vertical plate in air. Moreover, a He-Ne gas laser is employed as the light source in order to enhance the validity of this technique. The measuring results agree with a similar solution within ±10% at the local velocity u(y)=0.057∼0.185 m/s. It becomes clear that this technique using a He-Ne gas laser can obtain a whole instantaneous two-dimensional velocity distribution with fair accuracy.
