Corrosion sensing using a fiber optic system for magnetic field detection

An apparatus for corrosion detection of a material under test comprising:

• a proxy substrate comprising a magnetic material, wherein the proxy substrate is disposed the material under test;
• at least one fiber optic cable disposed on or near the proxy substrate;
• a signal generator coupled to the at least one fiber optic cable and configured to introduce one or more signals into the fiber optic cable;
• and
• a signal receiver/analyzer configured to receive the one or more signals after transmission through the at least one fiber optic cable and determine changes in the one or more signals occurring due to magnetic field changes in at least the proxy substrate as a result of corrosion of the material under test upon which the proxy substrate is disposed.

A method for corrosion detection of a material under test comprising:

• introducing one or more signals into a fiber optic cable disposed on the material under test;
• receiving the one or more signals after transmission through the fiber optic cable;
• and
• determining changes in the one or more signals occurring due to magnetic field changes in the material as a result of corrosion of the material correlating changes in the one or more signals resultant from magnetic field changes in the material.