RF Backscatter Sensor for Measuring Moisture and Other Biological Data
First Claim
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1. A moisture sensor unit for sending moisture in an environment, comprising:
- (a) a passive moisture sensor; and
(b) two passive RFID tags that are spaced apart from each other and disposed on opposite sides of the moisture sensor, each of the RFID tags electrically coupled to the moisture sensor and each of the RFID tags including a circuit that determines an amount of moisture that is associated with the moisture sensor, each of the RFID tags configured to respond to a first radio frequency signal with a second radio frequency signal that includes information about the amount of moisture.
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Abstract
A moisture sensor unit for sending moisture in an environment includes a passive moisture sensor and two passive RFID tags. The two passive RFID tags are spaced apart from each other and disposed on opposite sides of the moisture sensor. Each of the RFID tags is electrically coupled to the moisture sensor and each of the RFID tags includes a circuit that determines an amount of moisture that is associated with the moisture sensor. Each of the RFID tags is configured to respond to a first radio frequency signal with a second radio frequency signal that includes information about the amount of moisture.
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Citations
20 Claims
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1. A moisture sensor unit for sending moisture in an environment, comprising:
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(a) a passive moisture sensor; and (b) two passive RFID tags that are spaced apart from each other and disposed on opposite sides of the moisture sensor, each of the RFID tags electrically coupled to the moisture sensor and each of the RFID tags including a circuit that determines an amount of moisture that is associated with the moisture sensor, each of the RFID tags configured to respond to a first radio frequency signal with a second radio frequency signal that includes information about the amount of moisture. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A sensing system for sensing moisture in an environment, comprising:
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(a) a radio frequency transceiver configured to transmit a first signal and to receive a second signal; (b) a passive moisture sensor associated with the moisture; and (c) two passive RFID tags that are spaced apart from each other and disposed on opposite sides of the moisture sensor, each of the RFID tags electrically coupled to the moisture sensor and including a circuit that determines an amount of moisture that is associated with the moisture sensor, each of the RFID tags configured to respond to the first signal with the second signal so that the second signal includes information about the amount of moisture. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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20. A diaper for absorbing moisture voided by a wearer, comprising:
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(a) an outer shell; (b) an absorbent core structure disposed on the outer shell and configured to absorb moisture; and (c) a moisture sensor unit coupled to the absorbent core structure, including; (i) a passive moisture sensor disposed so that at least one electrical property of the moisture sensor depends on an amount of moisture in the absorbent core structure; and (ii) two passive RFID tags that are spaced apart from each other and disposed on opposite sides of the moisture sensor, each of the RFID tags electrically coupled to the moisture sensor and including a circuit that determines the amount of moisture in the absorbent core structure, each of the RFID tags configured to respond to a first radio frequency signal with a second radio frequency signal that includes information about the amount of moisture, a first one of the two passive RFID tags disposed in a first portion of the diaper so that if a wearer of the diaper is facing upwardly, then the a first one of the two passive RFID tags will be in a position to be responsive to the first signal, the second one of the two passive RFID tags disposed in a second portion of the diaper, different from the first portion of the diaper, so that if the wearer of the diaper is facing downwardly, then the a second one of the two passive RFID tags will be in a position to be responsive to the first signal.
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Specification