Abstract

Collective light scattering from density fluctuations is an established approach to optica! velocimetry that is applicable in flows without light scattering particles. It has traditionally been applied to plasma diagnostics [1], while recent interest has considered the use of collective scattering for velocimetry of high speed flows[2,3], where particles are either difficult to introduce, or do not accurately reflect the flow statistics. A generic limitation of this method is that the poor axial resolution results in measurements that are spatially averaged. We have introduced recently a hybrid Doppler/time-of-flight configuration [4], that provides improved axial resolution.

© 1996 IEEE