Abstract

Usual intracavity anemometry measurements of flow velocity using travelling-wave ring lasers are greatly influenced by nonreci- procial effects inevitably present in real laser resonator.^[1] In free space Doppler velocimetry of objects frequently requires receivers with very small inlet area or viewing angle for coherent-light detection.^[2] We suggest the combination of these methods allowing to overcome the above mentioned difficulties, i.e. Doppler velocimetry of a flow using a separated local inhomogeneity (SLI) (for example, highly reflecting particle or ensemble of particles injected into a flow), which moves together with the flow in a standing wave in linear or ring lasers.

© 1992 IQEC