RFID sensor array and sensor group based on pulse-processing
First Claim
1. A radio frequency identification tag device comprising:
- a clock generator;
a logic circuit for generating a serial code sequence;
at least one sensor array that includes at least one sensing element;
a sensing pulse generator with said sensing elements incorporated for generating sensing pulses the width of which changes with sensing values;
a signal generator that concatenates said serial code sequence and said sensing pulses;
a radio frequency tuned circuit;
a circuit for emitting modulated signals through said radio frequency tuned circuit.
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Abstract
An RFID device having sensor arrays incorporated in its tags. Each tag generates an ID code together with sensing pulses the width of which changes with sensing values. Conflicts between tags in communication are avoided by adding a sleep section to the code sequence. The interrogator reads the ID code and digitizes the width of sensing pulses during the communication with tags, and then calculates sensing values based on the information obtained. Since only discrete signals exist in data acquisition, and the digitization process is in parallel with data communication, the system needs neither ADC circuits nor an extra process for signal digitization.
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Citations
20 Claims
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1. A radio frequency identification tag device comprising:
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a clock generator; a logic circuit for generating a serial code sequence; at least one sensor array that includes at least one sensing element; a sensing pulse generator with said sensing elements incorporated for generating sensing pulses the width of which changes with sensing values; a signal generator that concatenates said serial code sequence and said sensing pulses; a radio frequency tuned circuit; a circuit for emitting modulated signals through said radio frequency tuned circuit. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A radio-frequency identification tag group that includes at least one tag device with each of its tag devices comprising:
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at least one sensor array which includes at least one sensing element; a clock generator; a logic circuit for generating a serial code sequence; a sensing pulse generator with said sensing elements incorporated for generating sensing pulses the width of which changes with sensing values; a signal generator that concatenates said serial code sequence and said sensing pulses; a sleep timer that adds a sleep section to the code generated by said signal generator; a radio frequency tuned circuit; a circuit for emitting modulated signals through said radio frequency tuned circuit. - View Dependent Claims (9, 10, 11, 12)
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13. A radio frequency interrogator device, comprising
a circuit that detects the RFID signal generated by a radio frequency tag device; -
a pulse processing unit for measuring the width of pulses in said RFID signal; a sensing value processing unit that generates sensing values based on the pulse width measured by said pulse processing unit; - View Dependent Claims (14, 15, 16, 17)
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18. A system for identifying and reading a sensing values, comprising:
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at least one radio frequency identification tag device that includes at least one sensor array which has at least one sensing element, a clock generator, a logic circuit for generating a serial code sequence, a sensing pulse generator with said sensing elements incorporated for generating sensing pulses the width of which changes with sensing values, a signal generator that concatenates said serial code sequence and said sensing pulses, a radio frequency tuned circuit, and a circuit for emitting modulated signals through said radio frequency tuned circuit; a radio frequency interrogator device having a circuit that detects the RFID signal generated by said radio frequency identification tag device, a pulse processing unit for measuring the width of pulses in said RFID signal, a sensing value processing unit that calculates sensing values based on the pulse width measured by said pulse processing unit; - View Dependent Claims (19)
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20. A system for identifying and reading sensing values according to calim 18, wherein said ratio frequency identification tag device further includes a sleep timer that adds a sleep section in the code sequence generated by said signal generator.
Specification