Tire pressure sensing devices, systems and methods employing an acoustic amplifier
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United States of America Patent
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Dec 6, 2011
Grant Date -
Apr 29, 2010
app pub date -
Oct 29, 2008
filing date -
Oct 29, 2008
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A pressure sensing device, such as a tire pressure monitoring unit comprises a pressure sensor for measuring pressure of a fluid, such as air or an inert gas, in an environment external to the device, such as within the cavity of a tire. A hollow resonator, or standing wave tube, is coupled to the pressure sensor. The resonator has a free end exposed to the external environment to the extent that pressure variations in the fluid are propagated through the hollow resonator to the pressure sensor via the free end. The hollow resonator has a resonant frequency substantially matching a target frequency such that resonance is established in the tube at the resonant frequency in response to the presence of an audio signal in the fluid having a frequency that substantially matches the target frequency.
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