Remote measurement employing RFID
First Claim
Patent Images
1. A measurement system, comprising:
- a transceiver configured to send and receive radio frequency signals;
a first transponder configured to receive radio frequency signals from the transceiver and to send radio frequency signals to the transceiver when within range of the transceiver, the first transponder comprising a Hall-effect sensor;
wherein the transceiver is configured to send an activation signal to the first transponder when in range of the transceiver, thereby enabling the Hall-effect sensor to make a measurement; and
wherein the first transponder is configured to make and to hold a measurement while outside the range of the transceiver.
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Abstract
A measurement system includes a transceiver and a transponder. The transceiver is configured to send and receive radio frequency signals. The transponder is configured to receive radio frequency signals from the transceiver and to send radio frequency signals to the transceiver. The transponder includes a sensor. The transceiver is configured to send an activation signal to the transponder thereby enabling the first transponder sensor to make a measurement and to hold the measurement.
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Citations
18 Claims
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1. A measurement system, comprising:
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a transceiver configured to send and receive radio frequency signals; a first transponder configured to receive radio frequency signals from the transceiver and to send radio frequency signals to the transceiver when within range of the transceiver, the first transponder comprising a Hall-effect sensor; wherein the transceiver is configured to send an activation signal to the first transponder when in range of the transceiver, thereby enabling the Hall-effect sensor to make a measurement; and wherein the first transponder is configured to make and to hold a measurement while outside the range of the transceiver. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method of making a measurement comprising:
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sending radio frequency signals from a transceiver to a transponder while the transponder is within transmission range of the transceiver; making a measurement with a Hall-effect sensor within the transponder while the transponder is outside the range of the transceiver; and holding the measurement within the transponder. - View Dependent Claims (12)
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13. A method of making a measurement comprising:
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sending radio frequency signals from a transceiver to a transponder while the transponder is within range of the transceiver; charging an analog circuit within the transponder from the radio frequency signals received from the transceiver; and activating a Hall-effect sensor within the transponder using the charged analog circuit; making a measurement with the Hall-effect sensor while the transponder is outside the range of the transceiver; and interrogating the transponder with the transceiver via radio frequency signals while in range such that the transceiver receives the measurement made by the Hall-effect sensor. - View Dependent Claims (14, 15, 16, 17, 18)
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Specification