Bubble-filled rubbery coatings may one day help make submarines virtually undetectable to sonar, researchers say.To avoid detection by sonar, military submarines are often covered with sound-absorbing tiles called anechoic coatings. These perforated rubber tiles are typically about 1 inch (2.5 centimeters) thick.
In the past decade, research has suggested that the same degree of stealth could be provided by much thinner coatings filled with vacant cavities.
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It seems like this approach would only lead to higher risk of passive noise generation on depth changes and higher scattering at unmatched frequencies. I.e. the simple counter would be a shift in frequency or broadband pulse for the active sonar, something that might even be achieved without any hardware upgrades on modern systems.
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