Pressure detecting apparatus for measuring pressure based on detected capacitance
First Claim
1. A capacitance-based pressure detecting apparatus for detecting pressure applied to a diaphragm based on a capacitance which varies with a change in portion of the diaphragm, comprising:
- a diaphragm changing position depending on a differential pressure between a first pressure and a second pressure;
a first electrode provided opposite a first plane of said diaphragm, forming together with said diaphragm, a first capacitor;
a second electrode provided opposite a second plane of said diaphragm, forming, together with said diaphragm, a second capacitor;
a third capacitor altering a capacitance according to the first pressure;
detecting means for detecting the capacitance of said first through third capacitors; and
operating means for obtaining pressure applied to said diaphragm based on the capacitance of said first and second capacitors, and amending the obtained pressure based on the capacitance of said third capacitor.
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Abstract
A capacitance-based pressure detecting apparatus detects a pressure applied to a diaphragm based on a capacitance which varies depending on the change in portion of the diaphragm. The pressure detecting apparatus comprises a diaphragm which changes position depending on a differential pressure between a first pressure and a second pressure, a first electrode which is provided opposite a first plane of the diaphragm and forms, together with the diaphragm, a first capacitor, a second electrode which is provided opposite a second plane of the diaphragm and forms, together with the diaphragm, a second capacitor, a third capacitor altering a capacitance according to the first pressure, a detecting unit for detecting the capacitance of the first through third capacitors, and an operation unit for obtaining a pressure applied to the diaphragm based on the capacitance of the first and second capacitors, and amending the obtained pressure based on the capacitance of the third capacitor.
91 Citations
33 Claims
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1. A capacitance-based pressure detecting apparatus for detecting pressure applied to a diaphragm based on a capacitance which varies with a change in portion of the diaphragm, comprising:
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a diaphragm changing position depending on a differential pressure between a first pressure and a second pressure; a first electrode provided opposite a first plane of said diaphragm, forming together with said diaphragm, a first capacitor; a second electrode provided opposite a second plane of said diaphragm, forming, together with said diaphragm, a second capacitor; a third capacitor altering a capacitance according to the first pressure; detecting means for detecting the capacitance of said first through third capacitors; and operating means for obtaining pressure applied to said diaphragm based on the capacitance of said first and second capacitors, and amending the obtained pressure based on the capacitance of said third capacitor. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33)
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Specification