Jesse Bang (USA) Active sonar cancellation The first layer should be any kind of material able to transmit 66% of wave energy and reflect 33%. 66% of the wave energy is transferred into the gap between the hulls, where it is then reflected yet again through the first layer. This accounts for 66% of 66% of the initial wave energy. since it most nearly matches that of the originally reflected 33%, and since the spacing is correct so that dephasing might occur, most of the waves will be cancelled, creating a much, much weaker sonar signal. It might be small enough to even avoid detection by sonar systems aboard submarines. If no such material is available, perhaps ordinary steel with holes would work. Of course there is the significant problem of not knowing the wavelengths of the many thousands of sonar devices on submarines throughout the world. Reward: the navy's recognition of a feasible technology |