Passive wireless corrosion sensor

• US 7,675,295 B2
• Filed: 09/05/2007
• Issued: 03/09/2010
• Est. Priority Date: 09/05/2007
• Status: Active Grant

• Current Assignee: Board of Regents of Oklahoma State University
• Original Assignee: Board of Regents of Oklahoma State University
• Inventors: Apblett, Allen W., Materer, Nicholas F.
• Primary Examiner(s): Nguyen; Vincent Q
• Application Number:
  US11/850,496
• Publication Number:
  US 20090058427A1
• Time in Patent Office: 916 Days
• Field of Search: 324/700, 324/71.2, 324/649, 324/76.1, 340/601, 205/775.5, 343/866, 343/867
• US Class Current: 324/649
• CPC Class Codes: G01N 17/04 Corrosion probes

Abstract

A passive wireless corrosion sensor is disclosed. A circuit is configured to provide a signal response when energized. An antenna is configured to wirelessly receive energy for energizing the circuit and to receive the signal response from the circuit and transmit the signal response. A corrosion sensitive connector interposes the circuit and the antenna. The corrosion sensitive connector conducts the energy from the antenna to the circuit and conducts the signal response from the circuit to the antenna when in a substantially non-corroded state. The corrosion sensitive connector creates an effectively non conducting link between the antenna and the circuit when in a substantially corroded state.

Claims

1. An apparatus for monitoring a degree of corrosion comprising:

an antenna that receives an interrogation signal;

an integrated circuit powered by the interrogation signal from the antenna; and

a plurality of corrosion sensitive connectors connected to the integrated circuit;

wherein the integrated circuit in response to the interrogation signal provides a continuity test of each of the plurality of corrosion sensitive connectors and provides a response back through the antenna indicative of the continuity test results.

2. The apparatus of claim 1, wherein the plurality of corrosion sensitive connectors has corrosion sensitive connectors of at least two thicknesses.

3. The apparatus of claim 1, further comprising a capacitor for storing energy from the interrogation signal for use by the integrated circuit.

4. The apparatus of claim 1, wherein each of the plurality of corrosion sensitive connectors are connected to the integrated circuit in parallel.

5. An apparatus for monitoring a degree of corrosion comprising:

an antenna that receives an interrogation signal;

a digital circuit powered by the interrogation signal from the antenna; and

a plurality of corrosion sensitive connectors connected to the integrated circuit;

wherein the digital circuit in response to the interrogation signal provides a continuity test of each of the plurality of corrosion sensitive connectors and provides a digital response back through the antenna indicative of the continuity test results.

6. The apparatus of claim 5, wherein the digital circuit provides an identifier along with the continuity test results.

7. A method of modeling corrosion of a test object, the method comprising providing one or more wireless corrosion sensors, the each sensor comprising:

a integrated circuit (IC) chip configured to provide a signal response when energized; and

an antenna configured to wirelessly receive energy for energizing the circuit and to receive the signal response from the circuit and transmit the signal response; and

a plurality of corrosion sensitive connectors electrically connected to the IC chip to allow for continuity testing of each of the plurality of corrosion sensitive connectors;

applying the plurality of corrosion sensors to the test object in locations where corrosion is monitored;

wirelessly energizing the plurality of wireless corrosion sensors; and

receiving a plurality of signal responses from the plurality of wireless corrosion sensors, the signal responses including results of continuity tests and an identifier from each of the corrosion sensors.

8. The method of claim 7, further comprising rendering a graphical depiction of a state of corrosion of the test object based upon the plurality of signal responses received from the plurality of wireless corrosion sensors.