The invention provides a single vector
hydrophone based measurement method for
acoustic reflection coefficient of a large-sample
underwater acoustic material. The method mainly comprises the followingsteps: (1) eliminating
diffraction sound at the edge of a sample; (2) constructing a
signal processing model; (3) separating direct sound from reflected sound; (4) obtaining the
acoustic reflection coefficient. On the one hand,
broadband narrow pulse is adopted as a form of a transmission
signal, time-frequency characteristics of the
signal are easy to control, the
diffraction sound at the edge of the sample can be separated in time, and the influence of the
diffraction sound can be avoided; on the other hand, a single vector
hydrophone is regarded as a three-element receiving array, and an array
signal processing algorithm of
subspace decomposition is adopted for
processing measurement data,
data processing is convenient and fast, and better real-time property is achieved; besides, a conventional sound source and a vector
hydrophone are used as core components of measurement, a traditional large-scale transmitting and receiving matrix is not needed, a huge and complicated measurementsystem is saved, few test steps are taken, and the
acoustic reflection coefficient of a concerned
frequency band can be obtained by one transmission, so that measurement efficiency is effectively improved.