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Fessenden oscillator
A Fessenden oscillator is an electro-acoustic transducer invented by Reginald Fessenden, with development starting in 1912 at the Submarine Signal Company of Boston.〔http://muse.jhu.edu/journals/tech/summary/v042/42.3frost01.html Summary of Frost 2001〕 It was the first successful acoustical echo ranging device. Similar in operating principle to a dynamic voice coil loudspeaker, it was an early kind of transducer, capable of creating underwater sounds and of picking up their echoes.
The creation of this device was motivated by the RMS ''Titanic'' disaster of 1912, which highlighted the need to protect ships from collisions with icebergs, obstacles, and other ships. Because of its relatively low operating frequency, it has been replaced in modern transducers by piezoelectric devices.
==Oscillator==
The ''oscillator'' in the name referred to the fact that the device vibrated and moved water in response to a driving AC current. It was not an oscillator in the electronic sense that it generated a repetitive signal, in fact electronic oscillators did not yet exist when this device was created. Since the design of the device does not depend on a resonant response, it should not be considered a harmonic oscillator either.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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