Magnetic tag using acoustic or magnetic interrogation
First Claim
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1. A magnetic tag for being remotely sensed, comprising:
- at least one soft magnetic element mounted for being excited in an inhomogeneous magnetic field, said at least one soft magnetic element having first and second ends and being clamped at at least one of said first and second ends, wherein no part of said at least one soft magnetic element other than said at least one of said first and second ends is clamped,each said at least one soft magnetic element responding to said excitation to produce a unique, time-varying magnetic field corresponding to its resonant frequency, when excited by an energy field which includes at least one distinct frequency corresponding to the resonant frequency of said magnetic element.
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Abstract
A tag structure suitable for attachment to an object and for being remotely sensed, includes at least one soft magnetic element mounted for being excited in an inhomogeneous magnetic field. The soft magnetic element includes first and second ends and is clamped at at least one of the first and second ends. Each soft magnetic element responds to the excitation to produce a unique, time-varying magnetic field corresponding to its resonant frequency, when excited. A system incorporating the tag includes an excitation device and a detector for detecting the mechanical vibrations of the soft magnetic element.
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Citations
20 Claims
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1. A magnetic tag for being remotely sensed, comprising:
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at least one soft magnetic element mounted for being excited in an inhomogeneous magnetic field, said at least one soft magnetic element having first and second ends and being clamped at at least one of said first and second ends, wherein no part of said at least one soft magnetic element other than said at least one of said first and second ends is clamped, each said at least one soft magnetic element responding to said excitation to produce a unique, time-varying magnetic field corresponding to its resonant frequency, when excited by an energy field which includes at least one distinct frequency corresponding to the resonant frequency of said magnetic element. - View Dependent Claims (2, 3, 4, 5, 6, 12, 13)
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7. A magnetic tag for being remotely sensed, comprising:
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at least one soft magnetic element mounted for being acoustically excited in an inhomogeneous magnetic field, each said at least one soft magnetic element vibrating at its respective resonant frequency to produce a unique, time-varying magnetic field corresponding to said resonant frequency, when excited by acoustic excitation, said at least one soft magnetic element being mounted within a Helmholtz resonator. - View Dependent Claims (8, 9, 10, 11)
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14. A magnetic tag for being remotely sensed, comprising:
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at least one soft magnetic element mounted for being excited in an inhomogeneous magnetic field, each said at least one soft magnetic element responding to said excitation to produce a unique, time-varying magnetic field corresponding to its resonant frequency, when excited by said excitation, wherein the tag is mounted in a Helmholtz resonator.
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15. A system for identifying an object, comprising:
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a magnetic tag for attachment to said object and for identification of said object upon being interrogated, said magnetic tag including at least one element of a soft magnetic material and having predetermined fundamental and overtone frequencies, said at least one element of soft magnetic material having first and second ends and being clamped at at least one of said first and second ends, wherein no part of said at least one element of soft magnetic material other than said at least one of said first and second ends is clamped; means for exciting said magnetic tag thereby to excite said at least one element of soft magnetic material to cause said soft magnetic element to mechanically vibrate; and means for detecting the mechanical vibrations of said soft magnetic element. - View Dependent Claims (16, 17, 18)
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19. A multibit magnetic tag for being remotely sensed, comprising:
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a plurality of soft magnetic elements mounted for being excited in an inhomogeneous magnetic field, each soft magnetic element of said plurality of soft magnetic elements having first and second ends and being clamped at at least one of said first and second ends, wherein no part of said each soft magnetic element other than said at least one of said first and second ends is clamped, each of said soft magnetic elements responding to said excitation to produce a unique, time-varying magnetic field corresponding to its resonant frequency, when excited by said excitation. - View Dependent Claims (20)
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Specification