Is a
Patent attributes
Current Assignee
Patent Jurisdiction
Patent Number
Date of Patent
June 3, 2008
Patent Application Number
11654292
Date Filed
January 16, 2007
Patent Primary Examiner
Patent abstract
An absolute pressure sensor is provided comprising a vibration sensing element such as a piezoelectric element disposed on a vibratable seal. The seal is disposed between two gas spring chambers which are maintained at substantially ambient pressure. The resonant vibration frequency of the seal changes and is proportional with the pressure in the gas spring chambers such that the electrical output of the piezoelectric element will be proportional to the vibration frequency. The frequency of the output of the piezoelectric element is read using suitable electronic circuitry and compared to a set of predetermined pressure/frequency data for calculation of a pressure value.
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