Single-shot time-domain coherent anti-Stokes Raman scattering: application to temperature and velocity measurements in supersonic flows.
It is shown that a new approach in time-domain coherent anti-Stokes Raman spectroscopy can be used to perform single-shot measurements of the static temperature and velocity in low-pressure supersonic flows. Instead of repetitively probing the macroscopic polarizibility coherently driven by a short-duration pump and Stokes pulses with variable delay times, we create the coherence with a long-duration pump and a short-duration Stokes pulse and probe it continuously with the same pump pulse.The decay of the anti-Stokes signal reveals the static temperature. The beating between two signals that are created in opposite crossing directions with respect to the flow direction gives the velocity of the flow.
Lefebvre
M
M
Péalat
M
M
Strempel
J
J