Water tank experiments for laser backward-scattering properties of bubble cluster

In this paper, we focus on the backward-scattering properties of bubbles. Firstly, the distribution of scattering intensity of a single bubble with multiple particle sizes is studied (the theory of single bubble scattering is Mie Theory). Based on single bubble scattering, the Monte-Carlo method is used to simulate multiple scattering characteristics of bubble clusters with different densities under uniform distribution. Then a water tank experiment for laser backward-scattering properties of imitated bubble clusters is carried out. The results show that: the intensity of a backward scattered echo signal is exponential with increase of probe distance; the variability of backward scattered echo signal intensity is basically met by Marius's law and with the change of receiving polarization angle, the dynamic range of the backward scattered echo signals from water can be compressed for a particular polarization degree; and, the signal to noise ratio of the echo signal is greatly affected by the size of the receiving field angle. e.