Abstract
The states of the structures within a harbor after underwater construction or after a disaster are mainly visually checked and confirmed by divers. A new method that is independent of the water turbidity is desired to replace this direct diver necessity. In this study, we propose a spherical acoustic lens consisting of two or more concentric layers for use in a real-time three-dimensional imaging SONAR, which has many advantages. It does not require electronic circuitry for the beam forming, and it has a wide field of view and can simultaneously collect signals from various directions. The acoustical characteristics of the spherical lens are analyzed under conditions in which the speed of sound of the lens materials by using a finite difference time domain (FDTD) method. The results show that the spherical lens has a narrower receive beam profile and a higher receive gain than conventional compound lenses consisting of three aspheric lens.
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