Abstract
Abstract : The use of Directional Frequency Analysis of Recording (DIFAR) acoustic subsystems as underwater acoustic intensity sensors in various Navy applications is the subject of this report. Specifically, acoustic intensity processing of DIFAR signals is used to enhance the detection of submerged bodies in the forward-scattered occlusion zone. In this zone, the incident and scattered pressure components arrive at the receiver at essentially the same time. The received signal is thus completely dominated by the incident blast from the source which renders the object undetectable. The problem of scattered wave detection in the forward-direction has been a fundamental unsolved problem of acoustics, electromagnetics and optics. The experimental results presented in this report for submerged-body acoustic scattering provide some very encouraging indications that acoustic vector intensity sensors, and the associated intensity processing, is a potential solution to this problem.
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