System for detecting and measuring parameters of passive transponders
First Claim
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1. A wireless passive transponder system, comprising:
- an inductively activated passive transponder which has a known resonate center frequency and bandwidth;
an inductive pulse generator which excites said transponder using a single magnetic pulse thereby causing said transponder to oscillate at said resonate center frequency;
a receiver which includes an amplitude modulation detector which extracts a demodulated signal of said oscillation of said transponder;
a measuring circuit which converts a decay rate of said demodulated signal to said transponder'"'"'s bandwidth;
a computational unit which replaces or augments said measuring circuit;
said computational unit controls a sequencing of pulses from said inductive pulse generator to form a collection of said receiver'"'"'s output data to form an interrogation cycle;
said computational unit averages or processes multiple said interrogation cycles to reduce noise to improve measurement accuracy of said transducer bandwidth, andsaid computational unit uses multiple randomly varying times between said interrogation cycles thereby reducing interference from background signals to improve measurement accuracy of said transducer bandwidth.
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Abstract
A detection and paramedic measuring system using a transponder composed of passive components and pulse inductive interrogation is disclosed. A methodology based on measuring the quality factor of the transponder is employed to detect a specific species of transponder or measure a parameter that alters the transponders quality factor.
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Citations
12 Claims
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1. A wireless passive transponder system, comprising:
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an inductively activated passive transponder which has a known resonate center frequency and bandwidth; an inductive pulse generator which excites said transponder using a single magnetic pulse thereby causing said transponder to oscillate at said resonate center frequency; a receiver which includes an amplitude modulation detector which extracts a demodulated signal of said oscillation of said transponder; a measuring circuit which converts a decay rate of said demodulated signal to said transponder'"'"'s bandwidth; a computational unit which replaces or augments said measuring circuit; said computational unit controls a sequencing of pulses from said inductive pulse generator to form a collection of said receiver'"'"'s output data to form an interrogation cycle; said computational unit averages or processes multiple said interrogation cycles to reduce noise to improve measurement accuracy of said transducer bandwidth, and said computational unit uses multiple randomly varying times between said interrogation cycles thereby reducing interference from background signals to improve measurement accuracy of said transducer bandwidth. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A wireless parametric measuring system comprising:
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an electromagnetic passive resonate transponder with an incorporated element that alters said transponder'"'"'s resonate bandwidth or quality factor based on a parameter being measured; an inductive pulse generator and antenna that excites said transponder causing said transponder to ring at a resonate frequency; a receiver and an antenna that detects said ringing of said transponder and measures a decay rate to determine a resonate bandwidth; wherein said excitation and said receive antennas are combined into a single element; wherein said center frequency and bandwidth of said transponder is fixed and said system is used to detect the presence of said transponder in a detection field where multiple transponders may be present; wherein each transponder from said multiple transponders has a different center frequency; a computational or display element that provides access to said resonate bandwidth to provide parametric data regarding said electromagnetic passive resonate transponder(s), and said computational element averages or processes multiple interrogation cycles to reduce noise to improve measurement accuracy of said transducer bandwidth. - View Dependent Claims (8, 9, 10, 11, 12)
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Specification