The investigation on the selection of measuring distance of acoustical holography

To investigate the selection of the underwater large-scale structures measuring distance in acoustical holography, first the sound field distribution of underwater large-scale structure is analyzed, and then for the sound pressure attenuation characteristics of three different regions in the sound field, the sound field reconstruction in a different location of measuring surface is selected. Simulation data analysis results show that: In the process of measuring surface move from Fresnel zone to distance, when the measuring surface is in the transition zone, the error curve of the sound pressure reconstruction declines rapidly. So to get certain sound field reconstruction accuracy and resolution for underwater large-scale structures, measuring surface should be chosen in the transition zone of sound field.