  We report an experimental investigation of various statistical properties of
the spatial Fourier modes of the vorticity field in turbulent jets for a large
range of Reynolds numbers ($530 \leq R_{\lambda} \leq 6100$). The continuous
time evolution of a spatial Fourier mode of the vorticity distribution,
characterized by a well defined wave-vector, is obtained from acoustic
scattering measurements. The spatial enstrophy spectrum, as a function of the
spatial wave-vector, is determined by scanning the incoming sound frequencies.
Time-frequency analysis of the turbulent vorticity fluctuations is also
performed for different length scales of the flows. Vorticity time-correlations
show that the characteristic time of a Fourier mode behaves as the sweeping
time. Finally, we report preliminary Lagrangian velocity measurements obtained
using acoustic scattering by soap bubbles inflated with helium. Gathering a
very large number ($\geq 13~10^{6}$) of passages of isolated bubbles in the
scattering volume, one is able to compute the Lagrangian velocity PDF and
velocity spectrum. Despite the spatial filtering due to the finite size of the
bubble, the latter exhibits a power law with the -2 exponent predicted by the
Komogorov theory, over one decade of frequencies.
