LRAD Systems

Long Range Acoustic Device or LRAD as it is popularly known is an acoustic hailing device and a sonic weapon. LRAD system is used by the armed forces, wildlife conservationists and other industrial and local purposes.

LRAD functions through a large speaker which is directly beamed onto the place intended. The wave number when multiplied by the size of the speaker radius gives us the direction of the sound wave. For LRAD, the wave number used is 19 and the sound waves are transmitted at about 2.5 kHz.

Acoustic Hailing Devices are capable of transmitting intelligible signals or sounds at high frequency over a long distance. They are normally used for communication in battlefields and at the sea. They are capable of transmitting voice signals up to a distance of 1.5 miles.

An acoustic hailing device is one where sound waves are transmitted to long distances with the help of this device. Sonic weapons are weapons which use sound waves to kill, maim or injure opponents. LRAD is used to scare away animals from airport runways, from solar, nuclear facilities.