Measuring and testing – Speed – velocity – or acceleration – With means for retaining reading
Patent
1976-12-06
1977-10-11
Woodiel, Donald O.
Measuring and testing
Speed, velocity, or acceleration
With means for retaining reading
73409, G01L 708
Patent
active
040529037
ABSTRACT:
A cup-shaped elastomeric diaphragm is snugly fitted onto an end portion of a support member which includes internal gas delivery and return passageways. A plurality of ports extend both radially and axially from the gas delivery passageway towards the diaphragm. A like number of identical gas return ports extend from another region of the diaphragm inwardly to the gas return passageway. A gas tight seal is provided between the diaphragm and the support member above the ports. In use the outer surface of the diaphragm is subjected to a pressure to be measured, e.g. subsurface hydrostatic pressure. A gas is delivered into the delivery passageway and through the sensor at a constant flow rate. The gas pressure expands the diaphragm in the regions of the ports to complete gas flow paths from the gas delivery ports to the gas return ports. The magnitude of the pressure to be measured acting on the diaphragm determines the gas pressure that is necessary to drive the gas through the sensor at a constant flow rate. The driving pressure of the gas is measured and is used to determine the magnitude of the pressure that is being measured.
REFERENCES:
patent: 3388598 (1968-06-01), Hall
patent: 3574284 (1971-04-01), Thordarson
Thor Instrument Company, Inc.
Woodiel Donald O.
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