Abstract

Although species concentrations and temperature are routinely measured by laser-molecular interactions (laser-induced fluorescence, Raman scattering), velocity is most often measured by the introduction of foreign seed particles, such as oil droplets or ceramic particles. Particle-imaging velocimetry systems are commercially available and provide velocity field measurements based on time-of-flight data from many particles. However, seeding non-uniformities and particle drag can lead to differences between the particle and gas velocity fields. Environmental and operational issues discourage the introduction of particles into large wind tunnel test facilities.

© 1998 Optical Society of America