Crack detection using a cutting-edge flexible eddy current sensor with voltage and phase measurement techniques

This study utilizes cutting-edge Flexible Eddy Current (FEC) sensors for the detection of cracks in aluminum plates with varying artificial crack sizes. The FEC sensor, relying on voltage and phase correction measurements, analyzes and processes signals from these cracks. The results demonstrate that excitation frequency and current have a significant impact on the induced current voltage and phase in the detection coil. Increasing these parameters linearly amplifies voltage, while phase changes primarily depend on the excitation frequency. To address phase change with large cracks, the phase correction method was employed, improving clarity for more accurate assessments. The study highlights the sensitivity of the FEC sensor in detecting cracks of various sizes, including subtle changes in voltage and phase for small cracks. Additionally, phase measurements, especially at higher excitation frequencies, offer better sensitivity and resolution. The study is also placed on the importance of scanning speed in acquiring crack data, as higher speeds may reduce data points and affect interpretation, requiring careful consideration.