Sonar 8 samples
ĭuring World War I the need to detect submarines prompted more research into the use of sound.
The ten Montreal-built British H-class submarines launched in 1915 were equipped with Fessenden oscillators.
The " Fessenden oscillator", operated at about 500 Hz frequency, was unable to determine the bearing of the iceberg due to the 3-metre wavelength and the small dimension of the transducer's radiating face (less than 1⁄ 3 wavelength in diameter). In that test, Fessenden demonstrated depth sounding, underwater communications ( Morse code) and echo ranging (detecting an iceberg at a 2-mile (3.2 km) range). Revenue Cutter Miami on the Grand Banks off Newfoundland. The Canadian engineer Reginald Fessenden, while working for the Submarine Signal Company in Boston, Massachusetts, built an experimental system beginning in 1912, a system later tested in Boston Harbor, and finally in 1914 from the U.S. The world's first patent for an underwater echo-ranging device was filed at the British Patent Office by English meteorologist Lewis Fry Richardson a month after the sinking of Titanic, and a German physicist Alexander Behm obtained a patent for an echo sounder in 1913. The use of sound to "echo-locate" underwater in the same way as bats use sound for aerial navigation seems to have been prompted by the Titanic disaster of 1912. In the late 19th century an underwater bell was used as an ancillary to lighthouses or lightships to provide warning of hazards.
The acoustic frequencies used in sonar systems vary from very low ( infrasonic) to extremely high ( ultrasonic). The term sonar is also used for the equipment used to generate and receive the sound. Sonar may also be used for robot navigation, and SODAR (an upward-looking in-air sonar) is used for atmospheric investigations. Acoustic location in air was used before the introduction of radar.
Sonar may be used as a means of acoustic location and of measurement of the echo characteristics of "targets" in the water. Two types of technology share the name "sonar": passive sonar is essentially listening for the sound made by vessels active sonar is emitting pulses of sounds and listening for echoes. Sonar (sound navigation and ranging) is a technique that uses sound propagation (usually underwater, as in submarine navigation) to navigate, measure distances ( ranging), communicate with or detect objects on or under the surface of the water, such as other vessels.
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