CAPACITANCE TYPE PRESSURE SENSOR
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United States of America Patent
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Issued Date -
Dec 10, 2009
app pub date -
Jun 11, 2007
filing date -
Jun 27, 2006
priority date (Note) -
Abandoned
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Abstract
A capacitance-type pressure sensor for measuring a change in a physical volume of a medium to be measured, by measuring two capacitances wherein the capacitances vary differently from each other in accordance with a change in the physical volume of the medium to be measured, provided with a function for measuring independent values for each capacitance and determining that there is an disconnect failure when at least one of these capacitance values falls below a capacitance value that indicates the normal operating range of the capacitance-type pressure sensor, to thereby provide a pressure sensor with higher reliability through performing the disconnect detection robustly.
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