Engine and technique for generating an acoustic signal
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United States of America Patent
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Nov 22, 2011
Grant Date -
Nov 13, 2008
app pub date -
May 12, 2008
filing date -
May 11, 2007
priority date (Note) -
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Abstract
An embodiment of device for generating an acoustic signal in a fluid includes an engine operable to repeat a thermodynamic process to vibrate a membrane of the engine to generate an acoustic signal having more than one period. The thermodynamic process includes heating mass inside a chamber of an engine to generate pressure inside the chamber; in response to generating the pressure, moving in a first direction a portion of a membrane of the engine; removing mass from inside the chamber to decrease the pressure inside the chamber; and in response to decreasing the pressure inside the chamber, moving the membrane portion in a second direction. Because the engine repeats the thermodynamic process, the engine can generate and sustain an acoustic signal for a significant amount of time.
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