A sonobuoy is an acoustic sensor device designed to detect underwater sounds like those made by submarines. Dropped from aircraft or ships into water, sonobuoys transmit acoustic data back to the deploying military units to help detect and track targets below the water's surface.
A typical Sonobuoys consists of an electronic package and a flotation device. The electronic package contains hydrophones to detect underwater sound waves, a radio transmitter to broadcast acoustic data back to the deploying unit and a power supply like batteries. The flotation component, often a small inflatable collar or tube, ensures the sonobuoy remains upright in the water column and maintains the hydrophones at a certain depth. Once in the water, a small explosive charge or CO2 cartridge inflates the flotation device to deploy horizontal hydrophone arrays.
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