Detecting delamination in a laminated structure

An apparatus for detecting delamination in a laminated structure, the laminated structure comprising a plurality of laminated layers, the apparatus comprising:

• one or more heaters mechanically and thermally connected to the laminated structure for heating the laminated structure, the one or more heaters being disposed between first and second ground layers within the laminated structure;
• a controller electrically coupled to the one or more heaters via source and return wires, the controller being configured to supply the one or more heaters with a DC current through the source and return wires to heat the one or more heaters;
• a magnetically saturable closed loop transformer core, the source and return wires carrying the DC current passing through the transformer core;
• and
• a delamination sensor coupled to the transformer core for detecting a DC current imbalance in the source and return wires,
• wherein the delamination sensor detects delamination in the laminated structure upon detection of a DC current imbalance in the source and return wires.