A Sharper Focus in Underwater Sound Images

Murky water is an excellent cloak, masking underwater features and objects from view. Sound can pierce straight through the murk by traveling around suspended particles in the water with minimal scattering. But sound's penetrating ability, thanks to its relatively long wavelengths, also means that it is difficult to "see" underwater objects in any detail. Now scientists have developed a new sonar technique that can image objects only a few inches in size.For more than a hundred years, scientists...