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Targets with known target strength are widely used in underwater acoustic experiments. Scattering theory shows that the target strength of objects made with regular material falls rapidly with the decrease of incident field frequency. The low-frequency target strength of air-filled objects is much higher than rigid objects with the same size because of resonance inside. Therefore air-filled objects...
Lots of study on bubbles scattering has shown that bubbles have much higher target strength than solid targets in low frequency condition. Based on this fact we can use gas-filled objects to simulate bubbles, achieving high target strength in low frequency condition. But with the existence of surface material, the scattering characteristics of gas-filled objects can be different with bubbles. In this...
Active sonar is used to detect submarines, usually working on a low frequency, but the scattering strength of sonar scatters from normal material is too small to match the scattering strength of submarines. The gas-filled cylinder scatters can form a partial interference environment, which may achieve the purpose of producing omnibearing interference to low frequency active sonar. In this article,...
Nowadays active sonars are used to detect submarines, and usually working on low frequency, while the scattering strength of scatterers made of normal material is too small to match with the scattering strength of submarines in small size. The gas-filled scatterers in small size can form a partial interference environment, which may achieve the purpose of omnibearing interference to low frequency...
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