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Environmental sensor system

  • US 8,115,646 B2
  • Filed: 05/28/2009
  • Issued: 02/14/2012
  • Est. Priority Date: 05/28/2009
  • Status: Active Grant
First Claim
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1. A method to detect one or more environmental conditions in proximity to a surface, comprising:

  • activating an environmental sensor module proximate the surface, wherein the environmental sensor is coupled to a transmitter and comprises a metamaterial-based electrically resonant structure which comprises a complement of a metamaterial spiral or split ring resonator and having a resonance frequency which varies in response to changes in at least one of;

    a humidity proximate the sensor module;

    a temperature proximate the sensor module;

    orthe presence of a chemical or biological agent proximate the sensor module;

    generating, in the environmental sensor module, an electromagnetic signal which comprises information about the resonance frequency;

    receiving, in a remote receiver, the electromagnetic signal comprising the signal generated by the environmental sensor module;

    determining an environmental condition from the electromagnetic signal;

    generating a first electromagnetic signal at a carrier frequency plus the local oscillator frequency; and

    transmitting the first electromagnetic signal.

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