Pressure sensor system
First Claim
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1. A measurement system comprising:
- measurement transducer means for measuring pressure as a function of displacement of capacitor plate members in said transducer means relative to one another and to a displacement axis;
bellow means aligned and coupled to said transducer means for displacement relative to said displacement axis, said bellow means having an interior space space for receiving fluid for pressure measurement;
housing means enclosing said bellow means and said transducer means whereby fluid under pressure, when applied to the interior space of said bellow means produces displacement of said bellow means and said transducer means relative to said displacement axis as a function of the fluid under pressure;
said bellow means and said transducer means being attached to opposite ends of said housing means so that said transducer means is in compression in a static condition; and
said transducer means being constructed of a material which when subjected to compression has a relatively small displacement along said displacement axis as compared to the displacement of said bellow means and where said material responds to compression forces applied by said bellow means with repeatable elastic characteristics and has a low temperature coefficient of expansion.
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Abstract
A measurement transducer with a functionally integral quartz material construction to provide spacing measurement gaps transverse to one another with metalized film surfaces defining capacitance plates and electrically conductive paths. The transducer is mounted under compression independent of a protective case and compensates for temperature changes to provide accurate measurements.
44 Citations
16 Claims
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1. A measurement system comprising:
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measurement transducer means for measuring pressure as a function of displacement of capacitor plate members in said transducer means relative to one another and to a displacement axis; bellow means aligned and coupled to said transducer means for displacement relative to said displacement axis, said bellow means having an interior space space for receiving fluid for pressure measurement; housing means enclosing said bellow means and said transducer means whereby fluid under pressure, when applied to the interior space of said bellow means produces displacement of said bellow means and said transducer means relative to said displacement axis as a function of the fluid under pressure; said bellow means and said transducer means being attached to opposite ends of said housing means so that said transducer means is in compression in a static condition; and said transducer means being constructed of a material which when subjected to compression has a relatively small displacement along said displacement axis as compared to the displacement of said bellow means and where said material responds to compression forces applied by said bellow means with repeatable elastic characteristics and has a low temperature coefficient of expansion. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A measurement system for use in a downhole well tool for sensing pressure data including
well tool housing means adapted for passage through a well bore to a well depth for sensing well pressure data; -
said well tool housing means including an outer housing means constructed from load supporting materials and including interconnected sections, said interconnected sections having hollow interiors for containing instrumentation for use in sensing well pressure data; one of said sections including first and second tubular outer housing members interconnected by a ring member and where said first tubular outer member is constructed and arranged to enclose electrical components; a tubular inner support housing member disposed within said second tubular outer housing member where said second outer housing member is connected at a terminal end to a terminal end of said second tubular outer housing member, said inner support housing member having an inwardly directed flange portion at an opposite terminal end, said inner support housing member being separated from the inner wall of said second outer housing member by an annular space; bellows means and measurement transducer means disposed within said inner support housing member with said transducer means including a quartz material under compression and with said bellows means attached at a terminal end to said inner support housing member so that fluid under pressure applied to the interior of said bellows means produces a displacement of said quartz material as a function of pressure; and means for providing fluid access from the exterior of said well tool to the interior of said bellows means. - View Dependent Claims (15, 16)
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Specification