レーザを用いた噴霧粒子の計測

Abstract

A basic knowlege for laser speckle photography (LSP) and in-line holographic interferometry is highly essential to obtain two-dimensional velocity distribution of particle jet impinged by the nozzle. LSP can measure the velocity distribution for the entire impinging field. However it is rather difficult to apply this LSP for the high-speed or unsteady flow using CW lasers like Ar-ion or He-Ne gas lasers with the optical chopper due to the intensity of palusive laser light.From this point of view the effort was made to obtain two dimentional velocity field of high-speed particle jet by the giant double pulsed ruby laser in this paper. It is clarified from the results that LSP using double pulsed laser can be masured with high accuracy in the renge of 51-10(m/sec). Parallel with this LSP method, double pulsed holographic interferometry technice is also carried out in order to visualize the two dimensional velocity field of particle, jet. This result agree well with the ones obtained by the LSP method. Through these total considerations, this LSP method is proved to be highly effective for the flow mesurement in a high speed particle jet.