Heart monitoring system or other system for measuring magnetic fields
First Claim
1. A system comprising:
- at least one first magnetic field sensor configured to measure first and second magnetic fields;
at least one second magnetic field sensor configured to measure the second magnetic field substantially without measuring the first magnetic field;
wherein the first and second magnetic field sensors comprise magneto-electric sensors, each magneto-electric sensor comprising alternating layers of magnetostrictive material and piezo-electric material;
wherein each magneto-electric sensor further comprises;
a magnet configured to sensitize the sensor;
an electromagnet configured to at least partially desensitize the sensor;
wherein the electromagnet in each magneto-electric configured sensor is configured to receive a carrier signal;
the at least one first magnetic field sensor is configured such that the carrier signal modulates the biasing magnetic field thereby emulating an up-converting heterodyne mixer, wherein the low frequency magnetic field signal is outputted from the sensor as coherent sidebands near the carrier frequency;
the at least one second magnetic field sensor is configured such that the carrier signal modulates the biasing magnetic field thereby emulating an up-converting heterodyne mixer, wherein the low frequency magnetic field signal is outputted from the sensor as coherent sidebands near the carrier frequency;
thereby repeatedly sensitizing and at least substantially desensitizing the at least one first and second magnetic field sensors; and
processing circuitry configured to perform signal cancellation to generate measurements of the first magnetic field and to generate an output based on the measurements of the first magnetic field.
1 Assignment
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Accused Products
Abstract
A system includes at least one first magnetic field sensor configured to measure first and second magnetic fields. The system also includes at least one second magnetic field sensor configured to measure the second magnetic field substantially without measuring the first magnetic field. The system further includes processing circuitry configured to perform signal cancellation to generate measurements of the first magnetic field and to generate an output based on the measurements of the first magnetic field. The sensors could represent magneto-electric sensors. The magneto-electric sensors could be configured to up-convert electrical signals associated with the first and/or second magnetic fields to a higher frequency. The processing circuitry could be configured to identify one or more problems associated with a patient'"'"'s heart.
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Citations
16 Claims
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1. A system comprising:
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at least one first magnetic field sensor configured to measure first and second magnetic fields; at least one second magnetic field sensor configured to measure the second magnetic field substantially without measuring the first magnetic field; wherein the first and second magnetic field sensors comprise magneto-electric sensors, each magneto-electric sensor comprising alternating layers of magnetostrictive material and piezo-electric material; wherein each magneto-electric sensor further comprises; a magnet configured to sensitize the sensor; an electromagnet configured to at least partially desensitize the sensor; wherein the electromagnet in each magneto-electric configured sensor is configured to receive a carrier signal; the at least one first magnetic field sensor is configured such that the carrier signal modulates the biasing magnetic field thereby emulating an up-converting heterodyne mixer, wherein the low frequency magnetic field signal is outputted from the sensor as coherent sidebands near the carrier frequency; the at least one second magnetic field sensor is configured such that the carrier signal modulates the biasing magnetic field thereby emulating an up-converting heterodyne mixer, wherein the low frequency magnetic field signal is outputted from the sensor as coherent sidebands near the carrier frequency; thereby repeatedly sensitizing and at least substantially desensitizing the at least one first and second magnetic field sensors; and processing circuitry configured to perform signal cancellation to generate measurements of the first magnetic field and to generate an output based on the measurements of the first magnetic field. - View Dependent Claims (2, 3, 4, 5)
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6. An apparatus comprising:
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a signal cancellation unit configured to; receive signals from at least one first magnetic field sensor configured to measure first and second magnetic fields; receive signals from at least one second magnetic field sensor configured to measure the second magnetic field substantially without measuring the first magnetic field; and wherein the first and second magnetic field sensors comprise magneto-electric sensors, each magneto-electric sensor comprising alternating layers of magnetostrictive material and piezo-electric material; wherein each magneto-electric sensor further comprises; a magnet configured to sensitize the sensor; an electromagnet configured to at least partially desensitize the sensor; wherein the electromagnet in each magneto-electric configured sensor is configured to receive a carrier signal; the at least one first magnetic field sensor is configured such that the carrier signal modulates the biasing magnetic field thereby emulating an up-converting heterodyne mixer, wherein the low frequency magnetic field signal is outputted from the sensor as coherent sidebands near the carrier frequency; the at least one second magnetic field sensor is configured such that the carrier signal modulates the biasing magnetic field thereby emulating an up-converting heterodyne mixer, wherein the low frequency magnetic field signal is outputted from the sensor as coherent sidebands near the carrier frequency; thereby repeatedly sensitizing and at least substantially desensitizing the at least one first and second magnetic field sensors; the at least one first and second magnetic field sensors configured to perform signal cancellation to generate measurements of the first magnetic field; and processing circuitry configured to generate an output based on the measurements of the first magnetic field. - View Dependent Claims (7, 8, 9, 10, 11, 12)
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13. A method comprising:
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receiving signals identifying first and second magnetic fields from at least one first magnetic field sensor; receiving signals identifying the second magnetic field but substantially not the first magnetic field from at least one second magnetic field sensor; performing signal cancellation to generate measurements of the first magnetic field; and generating an output based on the measurements of the first magnetic field. - View Dependent Claims (14, 15, 16)
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Specification