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
71 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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23-61. -61. (canceled)
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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.
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71-75. -75. (canceled)
Specification