An anemometer for the measurement of the velocity of particles of different components in a flow, separate and apart from that of the flow itself, is described. As a component-selective mechanism Raman scattering is used. The velocity is measured by relating the autocorrelated scattering signal to the known laser beam profile.
Florisson, O., de Mul, F. F. M., & de Winter, H. G. (1981). A Raman anemometer for component-selective velocity measurements of particles in a flow. Journal of physics E: scientific instruments, 14, 1445-1446. https://doi.org/10.1088/0022-3735/14/12/022