Precision transducer circuit and linearization method
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United States of America Patent
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May 28, 1991
Grant Date -
N/A
app pub date -
Jan 30, 1989
filing date -
Jan 30, 1989
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A method and apparatus for determining the extent of deflections of a movable diaphragm in a capacitive displacement type transducer. The transducer circuit is connected to a three terminal capacitive type transducer, and produces an output which is essentially of stray capacitances, circuit component tolerances and changes, and dimensional changes in the transducer elements caused by temperature changes. This is achieved by providing an output which is representative of the difference in the capacitances of the two transducer capacitors, nominalized by dividing by the sum of the capacitance reciprocals. The output of the transducer circuit thus represents the extent of the diaphragm deflection with all other transducer and circuit parameter variations removed.
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