基于平面声全息的全空间场变换:Ⅱ.水下大面积平面发射声基阵的近场声全息实验

研制了一套多通道水声声全息测量系统,解决了多通道系统的校准及弱散射水听器接收线阵的设计等问题。在非消声水池内,利用该系统对水下大面积平面发射声基阵进行了近场声全息实验,给出了声基阵表面的声强分布、声基阵各阵元及全阵的辐射声功率、基阵远场空间指向性图和指向性参数等。实验结果证明脉冲法和分区扫描数据合成的测量方法是可行的,实验系统的设计与实施方法可用于更大规模的声全息系统。

Full spatial transformation of sound field based on planar acoustic.holography: II. Experiment of NAH for submerged large area planar transmitting array

An underwater multi-channel NAH system has been developed and used for NAH experiment presented in this paper. Difficulties concurring the calibration of the system and design of the frame of the hydrophone line array for much less scattering are solved. The NAH experiment for a large area planar transmitting array is carried out in an anechoic water tank. The distributions of pressure intensity on the surface of the source are given through data processing. The radiated acoustic power of the transmitting array as a whole and each element of it are calculated respectively. The far field beam pattern and directional parameters are also deduced. The experimental results demonstrate that the use of pulse signal in NAH, the sequential scattering and composition method for data acquisition from the line array is feasible. The design of system and method of test are applicable to large-scale NAH systems.