This paper introduces research and development of a modern non-invasive device for determining flows velocity fields. is based on the ultrasonic method. The measured fluid flow surrounded by appropriate transmitters receivers, which communicate with each other. A physical principle this method consists in an interaction sound waves flow, generates certain delay transmission. found quantity thus...

Planetary nebulae (PNe) are very important kinematical tracers of the outer regions of early-type galaxies, where the integrated light techniques fail. Under ad hoc assumptions, they allow measurements of rotation velocity and velocity dispersion profile from descrete radial velocity fields. We present the results on the precision allowed by different set of radial velocity samples, discuss the...