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Detection of reinforcement metal corrosion

  • US 9,395,290 B2
  • Filed: 06/08/2011
  • Issued: 07/19/2016
  • Est. Priority Date: 06/09/2010
  • Status: Expired due to Fees
First Claim
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1. A system for detecting corrosion of metal within material, wherein the system comprises:

  • a sensor portion locatable within the material, wherein the sensor portion comprises;

    reinforcement metal,reference metal, andpassive sensing circuitry electrically coupled to the reinforcement metal and the reference metal and configured to measure a potential between the reinforcement metal and the reference metal, wherein the sensing circuitry is further configured to wirelessly transmit a signal representative of a corrosion potential of the reinforcement metal based on the potential between the reinforcement metal and the reference metal when energized, and further wherein the sensing circuitry is configured such that the resonant frequency of the signal representative of the corrosion potential shifts in response to a change in the potential between the reinforcement metal and the reference metal; and

    an interrogator portion locatable outside of the material, wherein the interrogator portion comprises interrogating circuitry configured to wirelessly transmit energy to the sensing circuitry of the sensor portion and to wirelessly receive the signal representative of the corrosion potential from the sensing circuitry of the sensor portion, and further wherein the interrogating circuitry of the interrogator portion is configured to generate one or more corrosion potential values representative of the corrosion potential of the reinforcement metal based on the resonant frequency of the signal representative of the corrosion potential which shifts in response to a change in the potential between the reinforcement metal and the reference metal.

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