WIRELESS SENSOR READER
First Claim
1. A method of obtaining a measurement from a remote location, the method comprising:
- transmitting a plurality of excitation pulses each at a predetermined frequency to a wireless sensor;
receiving a signal from said wireless sensor in response to said plurality of excitation pulses;
sampling and holding said received signal; and
ascertaining the frequency of said received signal;
wherein said wireless sensor is configured to change its resonant frequency in proportion to at least one sensed parameter.
1 Assignment
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Accused Products
Abstract
A wireless sensor reader is provided to interface with a wireless sensor. The wireless sensor reader transmits an excitation pulse to cause the wireless sensor to generate a ring signal. The wireless sensor reader receives and amplifies the ring signal and sends the signal to a phase-locked loop. A voltage-controlled oscillator in the phase-locked loop locks onto the ring signal frequency and generates a count signal at a frequency related to the ring signal frequency. The voltage-controlled oscillator is placed into a hold mode where the control voltage is maintained constant to allow the count signal frequency to be determined.
19 Citations
20 Claims
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1. A method of obtaining a measurement from a remote location, the method comprising:
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transmitting a plurality of excitation pulses each at a predetermined frequency to a wireless sensor; receiving a signal from said wireless sensor in response to said plurality of excitation pulses; sampling and holding said received signal; and ascertaining the frequency of said received signal; wherein said wireless sensor is configured to change its resonant frequency in proportion to at least one sensed parameter. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method of obtaining a measurement from a remote location, the method comprising:
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transmitting a plurality of excitation pulses to a wireless sensor, wherein said plurality of excitation pulses are spaced apart at fixed time intervals; receiving a signal from said wireless sensor in response to said plurality of excitation pulses; sampling and holding said received signal; and ascertaining the frequency of said received signal; wherein said wireless sensor is configured to change its resonant frequency in proportion to at least one sensed parameter. - View Dependent Claims (12, 13, 14, 15, 16)
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17. A system for obtaining a measurement from a remote location, said system comprising:
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a wireless sensor configured to change its resonant frequency in proportion to at least one sensed parameter; a reader configured to transmit an excitation pulse at only a fixed frequency to said wireless sensor and to receive a signal from said wireless sensor in response to said excitation pulse. - View Dependent Claims (18, 19, 20)
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Specification