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US 8,072,310 B1Granted
System for detecting and measuring parameters of passive transponders
AssigneePulsed Indigo Inc.
InventorHoward Richard Everhart
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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.
Claims12
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, 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.
5 more elements
A wireless parametric measuring system comprising:
- 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.
5 more elements
Dependencies are inferred from the claim text.