Measuring and testing – Testing sealed receptacle
Patent
1994-09-23
1997-01-07
Chilcot, Richard
Measuring and testing
Testing sealed receptacle
280736, 2807281, G01M 300, G01F 1500, B60R 2116, B60R 2126
Patent
active
055919006
ABSTRACT:
An apparatus (20) for sensing pressure in a stiff wall sealed vessel (30) comprises a piezoelectric transducer (200) operatively coupled to the vessel (30) for transferring energy to pressurized fluid in the vessel (30). A piezoelectric sensor (202) is operatively coupled to the vessel (30) for providing a received electrical signal having a frequency value indicative of the oscillation frequency of the pressurized fluid. A receiver circuit (224, 226, 228) is operatively connected to the sensor (202) and provides a fluid resonating signal having a frequency indicative of the fluid pressure in the vessel (30). A drive circuit (230) is operatively connected to the receiver circuit (224, 226, 228) and to the piezoelectric transducer (200). The drive circuit (230) initially drives the piezoelectric transducer (206) with noise. Subsequently, the drive circuit (230) drives the piezoelectric transducer (200) with an energy wave having a frequency equal to a frequency value functionally related to the natural frequency of the pressurized fluid in the vessel (30).
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Blackburn Brian K.
Bronowocki Allen J.
Gentry Scott B.
Kuritz Steven P.
Mazur Joseph F.
Chilcot Richard
Oen William L.
TRW Inc.
TRW Vehicle Safety Systems Inc.
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