Publications Details

Diffraction patterns produced by periodic and turbulent flowing gases including applications of photorefractive temporal filtering

Corvo, A.

The diffraction patterns produced by passing a laser beam through two different types of flowing gases are calculated. The first type of flow consists of periodic lines of gas flowing transverse to the beam's propagation. The second flow is turbulent. The measurable parameters in the diffraction patterns are derived and related to the gas temperature, pressure, velocity, and (in the case of the turbulent flow) to the flow's structure constant. A discussion on using the photorefractive effect to study turbulent flows is also given. In the latter case a method that relates the flow's structure constant to the decay time of the photorefractive crystal is given. 24 refs., 11 figs.