Underwater Acoustic Carbon Nanotube Thermophone
Naval Undersea Warfare Center Newport United States
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The present invention is an acoustically transparent carbon nanotube underwater acoustic source which acts as a thermophone based on an energy conversion of heat to sound. The principle of thermal acoustic transduction is thatwhen alternating current is passed through a comparatively thin transducer periodic heating takes place in the conductor following variations in current strength. This periodic heating produces temperature waves which propagate into a surrounding medium. The amplitude of the temperature wave decreases rapidly as the distance from the conductor increases. Based on the rapid production of these temperature waves the net effect is to produce a periodic rise in temperature in a limited portion of the medium near the conductor. Thermal expansion and contraction of this layer of the medium determines the amplitude of the resulting sound waves.
- Refractory Fibers