Abstract
We consider the problem of parametric sound generation in an acoustic interferometer
containing a fluid. We have taken explicitly into account both the influence of the nonlinearly
generated second harmonic and the effect of the unavoidable rising of the temperature due to
the acoustic wave. Two main new features under these considerations can be observed. On
one hand, the fundamental field does not achieve a saturating value when subharmonics fields
appear, but still grows with the driving. On the other hand, the subharmonics fields can exist
only for a limited range of driving value, due to the dependence of the cavity resonances with
the temperature of the medium. The experimental setup was designed and we show here the
experimental measurements, which are in good agreement with the predicted values for the
mode amplitudes and the parametric threshold.
