Sound Field Simulation And Research On Design Method Of Acoustic Lens

Acoustic lens is an important component of high-resolution imaging sonar system.It can replace the traditional electron beamforming to beamforming the incident acoustic wave of the sonar system.This paper combines high-resolution acoustic lens imaging technology,acoustic field analysis model and acoustics of acoustic lens.The sound field distribution and sound field performance of the lens,the analysis and design of the lens system,and the design of the dual-frequency lens system are analyzed and discussed in detail.The sound field model of the lens system is analyzed and compared in detail.The basic principles of ray acoustic and wave acoustic simulation models are briefly introduced.The basic principle and establishment method of the hybrid method analysis model are described in detail.The sound field performance of the lens was simulated by the hybrid analysis model.The focus position of the lens system was discussed.The geometric parameters of the lens(interface shape,aperture,interface eccentricity,number of lenses and lens spacing)were analyzed comprehensively,the influence of material parameters(material sound velocity,density,sound attenuation coefficient),temperature and other parameters on the sound field performance of the lens system,in order to make full use of the influence of various parameters on the sound field performance of the lens,the curve fitting method is introduced to describe some parameters and the influence relationship between the lens performance parameters can be estimated in the lens system design,which is convenient for the analysis and design of the lens system.According to the rules obtained by simulation and parameter estimation as a reference,the lens system can achieve batter performance by reasonably adjusting the values of the parameters of the lens system,thereby improving the imaging quality of the high-resolution imaging sonar.Two sets of lens systems are designed according to the obtained influence rule: 1.Single-frequency lens system composed of one lens;2.Double-lens lens system composed of two lenses.The effects of frequency on the lens system are analyzed in detail.The focus position and beam performance of the system at different frequencies are analyzed.Then,the problem of the placement position of the receiving primitives is discussed.The parameters of the system are combined to determine the two operating frequencies of the dual-frequency lens system.The zoom system of the dual-frequency lens system is designed to achieve good reception performance at both operating frequencies under the premise of receiving the array.