RFID SENSOR
First Claim
1. An RFID-based sensor, comprising:
- a plurality of discrete sensor elements, each sensor element configured to change conductivity state based on exposure of the sensor element to a physical condition; and
an RFID circuit coupled to the plurality of sensor elements, the RFID circuit configured to transmit an identification code, the identification code based at least in part on the conductivity state of the plurality of sensor elements.
1 Assignment
0 Petitions
Accused Products
Abstract
An RFID-based sensor includes a plurality of discrete sensor elements. Each sensor element changes conductivity state based on exposure of the sensor to a physical condition. An RFID circuit coupled to the plurality of sensor elements transmits a code corresponding to the conductivity states of the of sensor elements. The code may comprise the identification code of the RFID circuit. A level of exposure to the condition or a duration of exposure to the condition may be indicated by the code. Each of the sensor elements may be sensitive to a distinct condition and the code may indicate exposure to each of the distinct conditions. The code may indicate a prior exposure to a condition or may indicate a present exposure to the condition.
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Citations
34 Claims
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1. An RFID-based sensor, comprising:
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a plurality of discrete sensor elements, each sensor element configured to change conductivity state based on exposure of the sensor element to a physical condition; and
an RFID circuit coupled to the plurality of sensor elements, the RFID circuit configured to transmit an identification code, the identification code based at least in part on the conductivity state of the plurality of sensor elements. - View Dependent Claims (2, 3, 4, 5, 6)
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7. An RFID system, comprising:
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a plurality of sensor elements, each sensor element configured to change conductivity state based on exposure of the sensor element to a physical condition;
an RFID circuit coupled to the plurality of sensor elements, an identification code of the RFID circuit based at least in part on the conductivity state of the plurality of sensor elements; and
an RFID interrogator configured to receive the identification code from the RFID circuit. - View Dependent Claims (8, 9, 10, 11)
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12. A method, comprising:
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sensing a conductivity state of a plurality of sensor elements, each sensor element of the plurality of discrete sensor elements configured to change conductivity state based on exposure of the sensor element to a physical condition; and
forming an identification code of an RFID circuit using the sensed conductivity state of the plurality of sensor elements. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19)
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20. An RFID-based sensor, comprising:
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discrete sensor elements, each sensor element configured to switch from a first conductivity state associated with a first binary logic level to a second conductivity state associated with a second binary logic level based on exposure of the sensor element to a physical condition; and
an RFID circuit coupled to the discrete sensor elements, the RFID circuit configured to transmit a binary code corresponding to the conductivity states of the sensor elements. - View Dependent Claims (21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34)
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Specification