Wireless temperature sensor having no electrical connections
First Claim
1. A wireless temperature sensor for measuring a local environment temperature of interest, comprising:
- a first element consisting of an electrical conductor having first and second ends and shaped between said first and second ends for storage of an electric field and a magnetic field, said first and second ends remaining electrically unconnected such that said electrical conductor so-shaped defines an unconnected open-circuit having inductance and capacitance wherein, in the presence of a time-varying magnetic field, said electrical conductor so-shaped resonates to generate harmonic electric and magnetic field responses, each of which has a frequency associated therewith;
a second element consisting of a solid material in proximity to and overlapping at least a portion of said first element and located within said magnetic field responses of said conductor of said first element, wherein said first element and said second element are comprised within said sensor and are distinct from said local environment of interest and wherein said solid material is selected to experience changes in magnetic permeability properties in the presence of a temperature change in said solid material;
wherein said temperature change in said solid material results from exposure to a change in said local environment temperature of interest; and
a magnetic field response recorder for recording a baseline frequency response for said magnetic field responses so-generated when temperature of said solid material is not changing and monitoring said magnetic field responses so-generated for changes in frequency with respect to said baseline frequency response as an indication of a change in local environment temperature of interest.
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Accused Products
Abstract
A wireless temperature sensor includes an electrical conductor and a material spaced apart from the conductor and located within one or more of the responding electric field and responding magnetic field of the conductor. The conductor is electrically unconnected and is shaped for storage of an electric field and a magnetic field. In the presence of a time-varying magnetic field, the conductor resonates to generate harmonic electric and magnetic field responses, each of which has a frequency associated therewith. The material is selected such that it experiences changes in one of dielectric properties and magnetic permeability properties in the presence of a temperature change. Shifts from the sensor'"'"'s baseline frequency response indicate that the material has experienced a temperature change.
35 Citations
17 Claims
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1. A wireless temperature sensor for measuring a local environment temperature of interest, comprising:
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a first element consisting of an electrical conductor having first and second ends and shaped between said first and second ends for storage of an electric field and a magnetic field, said first and second ends remaining electrically unconnected such that said electrical conductor so-shaped defines an unconnected open-circuit having inductance and capacitance wherein, in the presence of a time-varying magnetic field, said electrical conductor so-shaped resonates to generate harmonic electric and magnetic field responses, each of which has a frequency associated therewith; a second element consisting of a solid material in proximity to and overlapping at least a portion of said first element and located within said magnetic field responses of said conductor of said first element, wherein said first element and said second element are comprised within said sensor and are distinct from said local environment of interest and wherein said solid material is selected to experience changes in magnetic permeability properties in the presence of a temperature change in said solid material; wherein said temperature change in said solid material results from exposure to a change in said local environment temperature of interest; and a magnetic field response recorder for recording a baseline frequency response for said magnetic field responses so-generated when temperature of said solid material is not changing and monitoring said magnetic field responses so-generated for changes in frequency with respect to said baseline frequency response as an indication of a change in local environment temperature of interest. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A wireless temperature sensor for measuring a local environment temperature of interest, comprising:
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a first element consisting of an electrically-insulating substrate; a second element consisting of an open-circuit pattern of electrically-conductive material on a face of said substrate, said pattern having two electrically unconnected ends, said pattern shaped for storage of an electric field and a magnetic field, said pattern having inductance and capacitance that allows said pattern to generate harmonic electric and magnetic field responses when in the presence of a time-varying magnetic field, each of said electric and magnetic field responses having a frequency associated therewith; a third element consisting of a solid material in proximity to and overlapping at least a portion of said second element and located within said magnetic field responses of said pattern, wherein said solid material is distinct from said local environment of interest and wherein said solid material is selected to experience changes in magnetic permeability properties in the presence of a temperature change in said solid material; wherein said temperature change in said solid material results from exposure to a change in said local environment temperature of interest; and a magnetic field response recorder for recording a baseline frequency response for said magnetic field responses so-generated when temperature of said solid material is not changing and monitoring said magnetic field responses so-generated for changes in frequency with respect to said baseline frequency response as an indication of a change in local environment temperature of interest. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17)
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Specification