Capacitive pressure sensor
First Claim
Patent Images
1. A pressure sensor, comprising:
- a first conductive layer;
a compressible dielectric contiguous said first conductive layer;
a second conductive layer contiguous said compressible dielectric, wherein said first and second conductive layers form a capacitor; and
said capacitor adapted to reflect a capacitance in relation to pressure changes on said compressible dielectric.
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Abstract
A capacitive pressure sensor comprises a pair of conductive plates surrounding a compressible dielectric to form a capacitor. Changes in pressure create changes in the capacitance of the capacitor which in turn may be measured to determine the changes in pressure. The pressure sensor may be constructed to be temperature and centripetal force compensated so that it may be positioned in a tire. A further embodiment uses the conductive plates to form a radiating element for the sensor such that it may wirelessly communicate with a remote interrogator.
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Citations
75 Claims
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1. A pressure sensor, comprising:
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a first conductive layer;
a compressible dielectric contiguous said first conductive layer;
a second conductive layer contiguous said compressible dielectric, wherein said first and second conductive layers form a capacitor; and
said capacitor adapted to reflect a capacitance in relation to pressure changes on said compressible dielectric. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
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23. A wheel, comprising:
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a rim;
a tire surrounding said rim and sealing a gas under pressure within a cavity formed by said tire and said rim; and
a pressure sensor associated with said rim for measuring the gas under pressure within the cavity, said pressure sensor comprising;
a first conductive layer;
a compressible dielectric contiguous said first conductive layer;
a second conductive layer contiguous said compressible dielectric, wherein said first and second conductive layers form a capacitor; and
said capacitor adapted to reflect a capacitance in relation to pressure changes within the cavity. - View Dependent Claims (24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39)
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40. A pressure sensing system, comprising:
a vehicle, comprising;
a control system; and
a wheel, comprising;
a rim;
a tire surrounding said rim and sealing a gas under pressure within a cavity formed by said tire and said rim;
a pressure sensor positioned on said rim for sensing pressure within said tire; and
a remote communication device associated with said pressure sensor and wirelessly communicating to pass information from said pressure sensor to a remote location. - View Dependent Claims (41, 42, 43, 44, 45, 46, 47, 48, 49)
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50. A method of sensing pressure, comprising:
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forming a capacitor from a compressible dielectric material and a pair of conductive layers; and
measuring capacitance associated with the capacitor, wherein changes in capacitance are related to changes in pressure as a function of the compressible dielectric. - View Dependent Claims (51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61)
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62. A method of sensing pressure in a wheel comprising a tire and a rim, comprising:
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forming a pressure sensor from a compressible material and a pair of conductive layers, thereby creating a capacitance;
placing the pressure sensor in the tire; and
determining pressure changes by changes in the compressible foam which affect the capacitance of the pressure sensor. - View Dependent Claims (63, 64, 65, 66, 67, 68, 69)
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70. A method of sensing pressure in a tire on a vehicle, comprising:
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forming a pressure sensor from a compressible material and a pair of conductive layers;
associating a remote communication device with the pressure sensor;
placing the pressure sensor in a tire;
determining pressure changes by changes in the compressible material which affect the capacitance of the pressure sensor; and
interrogating the remote communication device to convey information to the vehicle'"'"'s control system about pressure changes in the tire. - View Dependent Claims (71, 72, 73, 74, 75)
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Specification