Structure health monitoring has great significance on ensuring safety of flight

eddy current sensor on bottom layer is the key device to obtain state of structurs. The eddy current sensor is designed

prese crack monitoring system is carried out to monitor material of 304 austenitic stainless steel

2A12—T4 aluminum alloy and TC4 titanium alloy. Experimental result shows that while the optimal frequency increases monitoring of 304 austenitic stainless steel and TC4 titanium alloy material

which the conductivity is lower than 2A12—T4 aluminum alloy material. preset crack has different effects on amplitude and phase of transimpedance

amplitude change is greater than phase change; transimpedance change rate of Sensor increases along with increasing of crack width;the flexible eddy current sensor achieves recognition and quantitative monitoring on crack length.