Communicating with an implanted wireless sensor
First Claim
1. A method for determining a resonant frequency of a wireless sensor, comprising:
- generating a first set of energizing signals, wherein the first set of energizing signals comprises a plurality of energizing signals, each with a different frequency;
receiving a first set of sensor signals, wherein each sensor signal corresponds to one of the energizing signals;
determining a phase for each of the sensor signals in the first set of sensor signals;
determining a first group phase delay and a second group phase delay using the phases of the sensor signals;
comparing the first group phase delay to the second group phase delay; and
determining the resonant frequency of the wireless sensor based on the group phase delay comparison.
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Abstract
Aspects of the present invention determine the resonant frequency of a sensor by obtaining sensor signals in response to three energizing signals, measuring the phase of each sensor signal, and using a group phase delay to determine the resonant frequency. The phase difference between the first and second signal is determined as a first group phase delay. The phase difference between the second and third signal is determined as a second group phase delay. The first group phase delay and second group phase delay are compared. Based on the comparison, the system may lock on the resonant frequency of the sensor or adjust a subsequent set of three energizing signals.
172 Citations
23 Claims
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1. A method for determining a resonant frequency of a wireless sensor, comprising:
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generating a first set of energizing signals, wherein the first set of energizing signals comprises a plurality of energizing signals, each with a different frequency; receiving a first set of sensor signals, wherein each sensor signal corresponds to one of the energizing signals; determining a phase for each of the sensor signals in the first set of sensor signals; determining a first group phase delay and a second group phase delay using the phases of the sensor signals; comparing the first group phase delay to the second group phase delay; and determining the resonant frequency of the wireless sensor based on the group phase delay comparison. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method for determining a resonant frequency of a wireless sensor, comprising:
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receiving a first sensor signal having a first phase; receiving a second sensor signal having a second phase; receiving a third sensor signal having a third phase; generating a first group phase delay by subtracting the first phase from the second phase; generating a second group phase delay by subtracting the second phase from the third phase; comparing the first group phase delay to the second group phase delay by subtracting the first group phase delay from the second group phase delay; and based on the group phase delay comparison, determining the resonant frequency of the wireless sensor. - View Dependent Claims (11, 12, 13, 14)
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15. A system for determining a resonant frequency of a wireless sensor, comprising:
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a base unit for transmitting a first set of energizing signals and receiving a first set of sensor signals, wherein each of the energizing signals of the first set has a different frequency and each of the sensor signals of the first set has a phase; wherein the base unit comprises a signal processor for measuring the phase for each of the sensor signals, determining a first group phase delay and a second group phase delay based on the sensor signal phases, comparing the first group phase delay and second group phase delay, and determining a resonant frequency of the wireless sensor based on the comparison of the first group phase delay and second group phase delay. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22, 23)
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Specification