1 AIAA - 85 - 0172 Flow Velocity Measurement by Image Processing of Optically Activated Tracers

A computer ized f l ow v i s u a l i z a t i o n techn ique capab le o f q u a n t i f y i n g t h e f l o w f i e l d a u t o m a t i c a l l y has been developed. T h i s techn ique uses a f t e r g l o w i n g e f f e c t o f o p t i c a l l y a c t i v a t e d phosphorescent p a r t i c l e s t o r e t r i e v e v e c t o r i a l i n f o r m a t i o n on each t r a c e . By u s i n g r h i s i n f o r m a t i o n , i n c o n j u n c t i o n w i t h computer image process ing , t h e f l o w f i e l d o f a f r e e s u r f a c e t r a n s i e n t v o r t e x was i n v e s t i g a t e d .