Systems and methods for magneto-mechanical resonator sensors
First Claim
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1. A system for sensing a change in environment, comprising:
- a MMR sensor configured to be disposed in the environment, the MMR sensor comprising;
a magnetic bias layer having a first magnetic surface and an opposing second magnetic surface, the magnetic layer comprising a first electromagnetic material,a resonator having a first resonator major surface and an opposing second resonator major surface, the resonator comprising a second magnetic material, the second resonator major surface facing toward the first magnetic surface, wherein the first resonator major surface has a predefined channel that is recessed into the first resonator major surface,a spacer disposed between the magnetic bias layer and the resonator, andan environmental change receptor disposed proximate to the first resonator major surface, wherein a property of the environmental change receptor changes in response to a change to an environmental variable and thereby changes resonant frequency of the MMR sensor, wherein the environmental change receptor comprises an environmentally responsive material before the change in environment, and wherein the environmentally responsive material is distributed along at least a portion of the predefined channel when the environmental variable changes;
a reader configured to measure an after-change frequency characteristic of the MMR sensor after the environmental variable changes, wherein the change to the environmental variable is evaluated based on the after-change frequency characteristic.
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Abstract
Some aspects of the present disclosure feature a system for sensing a change in environment comprising a MMR sensor and a reader. The MMR sensor is configured to be disposed in the environment. The MMR sensor comprises a magnetic bias layer, a resonator, a spacer, and an environmental change receptor. The reader is configured to measure a frequency characteristic of the MMR sensor after the environmental variable changes and the change to the environmental variable is evaluated based on the frequency characteristic.
26 Citations
20 Claims
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1. A system for sensing a change in environment, comprising:
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a MMR sensor configured to be disposed in the environment, the MMR sensor comprising; a magnetic bias layer having a first magnetic surface and an opposing second magnetic surface, the magnetic layer comprising a first electromagnetic material, a resonator having a first resonator major surface and an opposing second resonator major surface, the resonator comprising a second magnetic material, the second resonator major surface facing toward the first magnetic surface, wherein the first resonator major surface has a predefined channel that is recessed into the first resonator major surface, a spacer disposed between the magnetic bias layer and the resonator, and an environmental change receptor disposed proximate to the first resonator major surface, wherein a property of the environmental change receptor changes in response to a change to an environmental variable and thereby changes resonant frequency of the MMR sensor, wherein the environmental change receptor comprises an environmentally responsive material before the change in environment, and wherein the environmentally responsive material is distributed along at least a portion of the predefined channel when the environmental variable changes; a reader configured to measure an after-change frequency characteristic of the MMR sensor after the environmental variable changes, wherein the change to the environmental variable is evaluated based on the after-change frequency characteristic. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A system for sensing a change in environment, comprising:
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a first MMR sensor and a second MMR sensor disposed in the environment, each of the first and the second MMR sensors comprising; a magnetic bias layer having a first magnetic surface and an opposing second magnetic surface, the magnetic layer comprising a first electromagnetic material, a resonator having a first resonator major surface and an opposing second resonator major surface, the resonator comprising a second magnetic material, the second resonator major surface facing toward the first magnetic surface, wherein the first resonator major surface has a predefined channel that is recessed into the first resonator major surface, a spacer disposed between the magnetic bias layer and the resonator, and an environmental change receptor disposed proximate to the first resonator major surface, wherein a property of the environmental change receptor changes in response to a change to an environmental variable and thereby changes resonant frequency of the respective MMR sensor, wherein the environmental change receptor comprises an environmentally responsive material before the change in environment, and wherein the environmentally responsive material is distributed along at least a portion of the predefined channel when the environmental variable changes; a reader configured to measure a respective after-change frequency characteristic of the first and second MMR sensors after the change to the environmental variable, wherein the change to the environmental variable is evaluated based on the after-change frequency characteristic. - View Dependent Claims (13)
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14. A method for detecting a change in environment, comprising:
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disposing a MMR sensor in the environment, the MMR sensor comprising; a magnetic bias layer having a first magnetic surface and an opposing second magnetic surface, the magnetic layer comprising a first electromagnetic material, a resonator having a first resonator major surface and an opposing second resonator major surface, the resonator comprising a second magnetic material, the second resonator major surface facing toward the first magnetic surface, wherein the first resonator major surface has a predefined channel that is recessed into the first resonator major surface, a spacer disposed between the magnetic bias layer and the resonator, and an environmental change receptor disposed proximate to the first resonator major surface, wherein a property of the environmental change receptor changes in response to a change to an environmental variable and thereby changes resonant frequency of the MMR sensor, wherein the environmental change receptor comprises an environmentally responsive material before the change in environment, and wherein the environmentally responsive material is distributed along at least a portion of the predefined channel when the environmental variable changes;
subjecting the MMR sensor to a change to an environmental variable;measuring an after-change frequency characteristic of the MMR sensor;
evaluating the change to the environmental variable based on the after-change frequency characteristic. - View Dependent Claims (15, 16, 17, 18, 19, 20)
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Specification